JP6691320B2 - Variable magnification optical system and optical equipment - Google Patents

Description

The present invention relates to a variable power optical system and an optical device.

  Conventionally, a variable power optical system having a short-distance focusing function by focusing of a plurality of groups has been proposed (for example, refer to Patent Document 1). However, Patent Document 1 has a problem that further improvement in optical performance is demanded.

JP-A-2009-271471

A variable power optical system according to a first aspect of the present invention is a variable power optical system that has a plurality of lens groups, and in which the distance between the lens groups changes during variable power, the aperture stop and the object side of the aperture stop And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving paths of the object-side focusing group and the image-side focusing group are different at the time of focusing, and one of the object-side focusing group and the image-side focusing group is When the focusing group is the second focusing group and the other is the second focusing group, the following condition is satisfied.
｜ ff1 / ff2 ｜ < 0.800
0.010 <| FZ2T / FZ1T | <1.000
0.699 ≤ | FZ2W / FZ2T | <0.950
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: When the first focusing group moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state Amount of variation of on-axis focusing position [mm]
FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state

  A variable power optical system according to a second aspect of the present invention is a variable power optical system that has a plurality of lens groups, and in which the distance between the lens groups changes during variable power, the aperture stop and the object side of the aperture stop. And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving paths of the object-side focusing group and the image-side focusing group are different at the time of focusing, and one of the object-side focusing group and the image-side focusing group is When the focusing group is the second focusing group and the other is the second focusing group, the following condition is satisfied.
| Ff1 / ff2 | <1,000
0.010 <| FZ2T / FZ1T | <1.000
0.764 ≤ | FZ2W / FZ2T | <0.950
  However,
  ff1: Focal length of the first focusing group
  ff2: focal length of the second focusing group
  FZ1T: Amount of variation [mm] of the axial focusing position when the first focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
  FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
  FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
  A variable power optical system according to a third aspect of the present invention is a variable power optical system that has a plurality of lens groups and in which the distance between the lens groups changes during variable power, and the aperture stop and the object side of the aperture stop And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving paths of the object-side focusing group and the image-side focusing group are different at the time of focusing, and one of the object-side focusing group and the image-side focusing group is When the focusing group is used and the other is the second focusing group, the condition of the following equation is satisfied,
｜ ff1 / ff2 ｜ <0.700
0.010 <| FZ2T / FZ1T | <1.000
0.050 <| FZ2W / FZ2T | <0.950
  However,
  ff1: Focal length of the first focusing group
  ff2: focal length of the second focusing group
  FZ1T: Amount of variation [mm] of the axial focusing position when the first focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
  FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
  FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
  The first focusing group is characterized by having a lens that satisfies the following condition.
νd1> 45.0
  However,
  νd1: Abbe number for the d-line of the medium of the lens included in the first focusing group
  A variable power optical system according to a fourth aspect of the present invention is a variable power optical system that has a plurality of lens groups, and in which the distance between the lens groups changes during variable power, the aperture stop and the object side of the aperture stop And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving loci of the object-side focusing group and the image-side focusing group are different at the time of focusing, the object-side focusing group is one, and the object-side focusing group is composed of one negative lens. A negative lens group having a negative refractive power is provided at a position facing the object side of the group, and a positive lens group having a positive refractive power is provided at a position facing the image side of the object side focusing group, When one of the object-side focusing group and the image-side focusing group is the first focusing group and the other is the second focusing group, the condition of the following equation is Characterized by foot.
｜ ff1 / ff2 ｜ <0.700
0.010 <| FZ2T / FZ1T | <1.000
0.050 <| FZ2W / FZ2T | <0.950
  However,
  ff1: Focal length of the first focusing group
  ff2: focal length of the second focusing group
  FZ1T: Amount of variation [mm] of the axial focusing position when the first focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
  FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
  FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
  A variable power optical system according to a fifth aspect of the present invention is a variable power optical system that has a plurality of lens groups and in which the distance between the lens groups changes during variable power, the aperture stop and the object side of the aperture stop. And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving paths of the object-side focusing group and the image-side focusing group are different at the time of focusing, and one of the object-side focusing group and the image-side focusing group is When the focusing group is the second focusing group and the other is the second focusing group, the following condition is satisfied.
| Ff1 / ff2 | <1,000
0.010 <| FZ2T / FZ1T | <1.000
0.050 <| FZ2W / FZ2T | <0.950
ff1> 0
  However,
  ff1: Focal length of the first focusing group
  ff2: focal length of the second focusing group
  FZ1T: Amount of variation [mm] of the axial focusing position when the first focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
  FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
  FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state

A variable power optical system according to a sixth aspect of the present invention is a variable power optical system that has a plurality of lens groups and in which the distance between the lens groups changes during variable power, the aperture stop and the object side of the aperture stop. And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving paths of the object-side focusing group and the image-side focusing group are different at the time of focusing, and one of the image-side focusing groups is defined as the first focusing group, and one of the object-side focusing groups is It is characterized in that the condition of the following equation is satisfied when one is the second focusing group.
｜ ff1 / ff2 ｜ < 0.800
0.699 ≤ | FZ2W / FZ2T | <0.950
However,
ff1: focal length of first focusing group ff2: focal length of second focusing group
FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state
A variable power optical system according to a seventh aspect of the present invention is a variable power optical system that has a plurality of lens groups and in which the distance between the lens groups changes during variable power, and is an aperture stop and an object side of the aperture stop. And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving loci of the object-side focusing group and the image-side focusing group are different at the time of focusing, and the positive lens group having a positive refractive power and the negative refracting power are closer to the object side than the object-side focusing group. Having at least one negative lens group having power, the distance between the positive lens group and the negative lens group and the distance between the negative lens group and the object-side focusing group change during zooming, When one of the focusing groups is the first focusing group and one of the object side focusing groups is the second focusing group, the condition of the following equation is satisfied,
| Ff1 / ff2 | <1,000
However,
ff1: Focal length of the first focusing group
ff2: focal length of the second focusing group
The first focusing group is characterized by having a lens that satisfies the following condition.
νd1> 45.0
However,
νd1: Abbe number for the d-line of the medium of the lens included in the first focusing group
A variable power optical system according to an eighth aspect of the present invention is a variable power optical system that has a plurality of lens groups and in which the distance between the lens groups changes during variable power, the aperture stop and the object side of the aperture stop. And at least one object-side focusing group that moves in the optical axis direction during focusing, and at least one image-side focusing group that is positioned closer to the image side than the aperture stop and moves in the optical axis direction during focusing. , And the moving paths of the object-side focusing group and the image-side focusing group are different at the time of focusing, and the positive lens group having a positive refractive power and the negative refracting power are located closer to the object side than the object-side focusing group. Having at least one negative lens group having power, the distance between the positive lens group and the negative lens group and the distance between the negative lens group and the object-side focusing group change during zooming, There is one focusing group, which consists of one negative lens, and has a negative refracting power at the position facing the object side of the object side focusing group. And a positive lens group having a positive refractive power at a position facing the image side of the object side focusing group, and one of the image side focusing groups is referred to as a first focusing group. When one of the object-side focusing groups is the second focusing group, the following condition is satisfied.
| Ff1 / ff2 | <1,000
However,
ff1: Focal length of the first focusing group
ff2: focal length of the second focusing group
A variable power optical system according to a ninth aspect of the present invention is a variable power optical system that has a plurality of lens groups and in which the distance between the lens groups changes at the time of variable power, the aperture stop and the object side of the aperture stop. And at least one object-side focusing group that is arranged on the image side and moves in the optical axis direction during focusing, and at least one image-side focusing group that is arranged on the image side of the aperture stop and moves in the optical axis direction during focusing. , And the moving paths of the object-side focusing group and the image-side focusing group are different at the time of focusing, and the positive lens group having a positive refractive power and the negative refracting power are located closer to the object side than the object-side focusing group. Having at least one negative lens group having power, the distance between the positive lens group and the negative lens group, and the distance between the negative lens group and the object-side focusing group change during zooming, When one of the focusing groups is the first focusing group and one of the object side focusing groups is the second focusing group, it is necessary to satisfy the following condition. And butterflies.
| Ff1 / ff2 | <1,000
ff1> 0
However,
ff1: Focal length of the first focusing group
ff2: focal length of the second focusing group

FIG. 4 is a cross-sectional view showing a lens configuration of a variable power optical system according to Example 1 in the infinity in-focus state, wherein (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) ) Indicates the telephoto end state. FIG. 7 is a diagram of various types of aberration of the variable power optical system according to the first embodiment when focused on an object at infinity, where (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto state. Indicates the end condition. FIG. 6 is a diagram showing various aberrations of the variable power optical system according to the first embodiment in a close-up focus state, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto end. Indicates the status. FIG. 6B is a cross-sectional view showing the lens configuration of the variable power optical system of Example 2 in the infinity focused state, in which (W) shows the wide-angle end state, (M) shows the intermediate focal length state, and (T) ) Indicates the telephoto end state. FIG. 8 is a diagram of various types of aberration of the variable power optical system according to the second embodiment in an in-focus state at infinity, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto state. Indicates the end condition. FIG. 9A is a diagram showing various aberrations of the variable power optical system according to the second embodiment in a close-up focus state, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto end. Indicates the status. FIG. 9A is a cross-sectional view showing a lens configuration of a variable power optical system of Example 3 in the infinity focused state, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) ) Indicates the telephoto end state. FIG. 16 is a diagram of various types of aberration of the variable power optical system according to the third embodiment in the in-focus state at infinity, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto state. Indicates the end condition. FIG. 16 is a diagram showing various aberrations of the variable power optical system according to the third embodiment in a close-up focus state, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto end. Indicates the status. FIG. 9B is a cross-sectional view showing the lens configuration of the variable power optical system of Example 4 in the infinity focused state, in which (W) shows the wide-angle end state, (M) shows the intermediate focal length state, and (T) ) Indicates the telephoto end state. FIG. 16 is a diagram of various types of aberration of the variable power optical system according to the fourth embodiment in the in-focus state at infinity, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto state. Indicates the end condition. FIG. 16A is a diagram showing various aberrations of the variable power optical system according to the fourth embodiment in a close-up focus state, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto end. Indicates the status. It is sectional drawing which shows the lens structure of the variable magnification optical system which concerns on 5th Example at the infinite point focusing state, (W) shows a wide-angle end state, (M) shows an intermediate focal length state, (T) ) Indicates the telephoto end state. FIG. 16 is a diagram of various types of aberration of the variable power optical system according to the fifth embodiment when focused on infinity, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto state. Indicates the end condition. FIG. 16A is a diagram showing various aberrations of the variable power optical system according to the fifth embodiment in a close-up focus state, in which (W) shows a wide-angle end state, (M) shows an intermediate focal length state, and (T) shows a telephoto end. Indicates the status. FIG. 3 is a sectional view of a camera equipped with the variable power optical system. 7 is a flowchart for explaining a method of manufacturing the variable power optical system.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the variable power optical system ZL according to this embodiment has a plurality of lens groups and is configured so that the distance between the lens groups changes during variable power. The variable power optical system ZL includes an aperture stop S, at least one object-side focusing group GfF which is disposed on the object side of the aperture stop S and moves in the optical axis direction during focusing, and an image side of the aperture stop S. And at least one image-side focusing unit GfR that moves in the optical axis direction when focused. In addition, the object-side focusing group GfF and the image-side focusing group GfR are configured to have different movement loci during focusing. In this way, by performing focusing with a plurality of focusing groups arranged before and after the aperture stop S, it is possible to favorably correct off-axis performance at short-distance focusing, particularly field curvature.

  Here, in the variable power optical system ZL according to the present embodiment, one of the object-side focusing group GfF and the image-side focusing group GfR is one as the first focusing group Gf1 and the other is the second focusing group Gf1. When the focusing group Gf2 is set, the following conditional expression (1) is satisfied.

| Ff1 / ff2 | <1,000 (1)
However,
ff1: focal length of the first focusing group Gf1 ff2: focal length of the second focusing group Gf2

  In this conditional expression (1), of one of the object-side focusing group GfF and one of the image-side focusing group GfR, the one having the higher refractive power is the first focusing group Gf1, and the one having the weaker refractive power is the first. This is defined as the two focus group Gf2. In the variable power optical system ZL according to the present embodiment, the first focusing group Gf1 has a function of forming an image of an object on the image plane when the object moves, and the second focusing group Gf2 includes the first focusing group Gf1. It has a function of correcting peripheral aberration (off-axis aberration) due to movement of the focusing group Gf1. If the upper limit of conditional expression (1) is exceeded, the refracting power of the first focusing unit Gf1 will weaken, the amount of movement during focusing will increase, and off-axis aberrations, field curvature, and coma that occur during focusing will also increase. Aberrations occur too much. Further, if the refracting power of the second focus unit Gf2 becomes too strong, the spherical aberration will be deteriorated when the field curvature correction is performed. In order to ensure the effect of this conditional expression (1), it is desirable to set the upper limit of conditional expression (1) to 0.900. In order to further secure the effect of conditional expression (1), it is desirable to set the upper limit value of conditional expression (1) to 0.800. Further, in order to further secure the effect of the conditional expression (1), it is desirable to set the upper limit value of the conditional expression (1) to 0.700. In order to further secure the effect of conditional expression (1), it is desirable to set the upper limit value of conditional expression (1) to 0.600. In order to further secure the effect of conditional expression (1), it is desirable to set the upper limit of conditional expression (1) to 0.500.

  Further, in the vicinity of the lower limit of conditional expression (1), the refractive power of the second focus unit Gf2 becomes too weak, so that it becomes impossible to satisfactorily correct the field curvature. Therefore, in order to ensure the effect of this conditional expression (1), it is desirable to set the lower limit of conditional expression (1) to 0.020. Further, in order to further secure the effect of the conditional expression (1), it is desirable to set the lower limit value of the conditional expression (1) to 0.040. In order to further secure the effect of conditional expression (1), it is desirable to set the lower limit value of conditional expression (1) to 0.060. In order to further secure the effect of conditional expression (1), it is desirable to set the lower limit value of conditional expression (1) to 0.080. In order to further secure the effect of conditional expression (1), it is desirable to set the lower limit value of conditional expression (1) to 0.100.

  Further, it is desirable that the variable power optical system ZL according to the present embodiment satisfies the following conditional expression (2).

0.010 <| FZ2T / FZ1T | <1.000 (2)
However,
FZ1T: Amount of variation [mm] of the on-axis focusing position when the first focusing group Gf1 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit Gf2 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.

  Conditional expression (2) defines the in-focus position sensitivities of the first focus group Gf1 and the second focus group Gf2 in the wide-angle end state in order to obtain good close-up performance. By satisfying this conditional expression (2), the axial focusing position fluctuation amount becomes smaller in the second focusing group Gf2 than in the first focusing group Gf1. As described above, since the second focusing group Gf2 corrects the off-axis aberrations, the on-axis focusing position variation amount needs to be smaller than that of the first focusing group G1f, and the variation amount is large. The easier the correction becomes. If the upper limit of conditional expression (2) is exceeded, the on-axis focusing position fluctuation amount of the second focusing group Gf2 becomes large, and the first focusing group Gf1 moves to align the on-axis and off-axis focusing positions. The amount becomes large, and spherical aberration and coma aberration at the time of focusing at a short distance become large. In order to ensure the effect of conditional expression (2), it is desirable to set the upper limit of conditional expression (2) to 0.900. In order to further secure the effect of conditional expression (2), it is desirable to set the upper limit of conditional expression (2) to 0.800. In order to further secure the effect of conditional expression (2), it is desirable to set the upper limit of conditional expression (2) to 0.750. In order to further secure the effect of conditional expression (2), it is desirable to set the upper limit of conditional expression (2) to 0.700. On the other hand, when the value goes below the lower limit of conditional expression (2), the refracting power of the second focus unit Gf2 becomes weak, so that it becomes difficult to correct the off-axis aberration. In order to ensure the effect of conditional expression (2), it is desirable to set the lower limit of conditional expression (2) to 0.015. In order to further secure the effect of conditional expression (2), it is desirable to set the lower limit value of conditional expression (2) to 0.020. In order to further secure the effect of conditional expression (2), it is desirable to set the lower limit value of conditional expression (2) to 0.025. In order to further secure the effect of conditional expression (2), it is desirable to set the lower limit value of conditional expression (2) to 0.030.

  Further, it is desirable that the variable power optical system ZL according to the present embodiment satisfies the following conditional expression (3).

0.050 <| FZ2W / FZ2T | <0.950 (3)
However,
FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit Gf2 moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit Gf2 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.

  Conditional expression (3) defines the focusing position sensitivity in the wide-angle end state and the telephoto end state in the second focusing group Gf2 in order to obtain good close-up performance. By satisfying the conditional expression (3), the focus position variation amount of the second focus group Gf2 is larger in the telephoto end state than in the wide-angle end state. The second focus group Gf2 corrects off-axis aberrations, but field curvature is likely to occur in the wide-angle end state, and it is desirable that the change in focus position on the axis is small. If the upper limit of conditional expression (3) is exceeded, it becomes impossible to properly adjust the on-axis and off-axis in-focus positions in the wide-angle end state. In order to ensure the effect of conditional expression (3), it is desirable to set the upper limit of conditional expression (3) to 0.900. In order to further secure the effect of conditional expression (3), it is desirable to set the upper limit of conditional expression (3) to 0.850. On the other hand, when the value goes below the lower limit of the conditional expression (3), the on-axis and off-axis focusing positions cannot be properly adjusted in the telephoto end state. In order to ensure the effect of conditional expression (3), it is desirable to set the lower limit of conditional expression (3) to 0.250. In order to further secure the effect of conditional expression (3), it is desirable to set the lower limit value of conditional expression (3) to 0.350. In order to further secure the effect of conditional expression (3), it is desirable to set the lower limit value of conditional expression (3) to 0.500. In order to further secure the effect of conditional expression (3), it is desirable to set the lower limit value of conditional expression (3) to 0.600.

  In the variable power optical system ZL according to this embodiment, one of the image-side focusing groups GfR is a first focusing group Gf1, and one of the object-side focusing groups GfF is a second focusing group. Is desirable. When the object-side focusing group GfF is the first focusing group Gf1, there is a concern that the diameter of the front lens may be increased and the field curvature aberration may occur. Therefore, the image-side focusing group GfR is changed to the first focusing group Gf1. It is desirable to do.

  Further, it is desirable that the variable power optical system ZL according to the present embodiment satisfies the following conditional expression (4), that is, the first focusing group Gf1 has a positive refractive power.

ff1> 0 (4)
However,
ff1: focal length of the first focusing group Gf1

  Further, it is desirable that the variable power optical system ZL according to the present embodiment satisfies the following conditional expression (5), that is, the second focusing group Gf2 has a negative refractive power.

ff2 <0 (5)
However,
ff2: focal length of the second focusing group Gf2

  When the variable magnification optical system ZL according to the present embodiment satisfies the conditional expression (5), it is desirable that the following conditional expression (3 ′) is satisfied instead of the above conditional expression (3). .

0.400 <| FZ2W / FZ2T | <0.950 (3 ')
However,
FZ2W: Variation amount of axial focusing position [mm] when the second focusing unit Gf2 moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Amount of variation [mm] in the axial focusing position when the second focusing unit Gf2 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.

  Further, it is desirable that the variable power optical system ZL according to the present embodiment satisfy the following conditional expression (6).

0.010 <| FZ1W / FZ1T | <1.500 (6)
However,
FZ1W: Variation amount of axial focusing position [mm] when the first focusing unit Gf1 moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ1T: Amount of variation [mm] of the on-axis focusing position when the first focusing group Gf1 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.

  Conditional expression (6) defines the focusing position sensitivity in the wide-angle end state and the telephoto end state in the first focusing group Gf1 in order to obtain good close-up performance. If the upper limit of conditional expression (6) is exceeded, the axial sensitivity of the first focusing unit Gf1 in the wide-angle end state becomes high, and the fluctuations of spherical aberration and coma aberration become large, so that good close-up performance is obtained. I can't. In order to ensure the effect of conditional expression (6), it is desirable to set the upper limit of conditional expression (6) to 0.700. Further, in order to further secure the effect of the conditional expression (6), it is desirable to set the upper limit value of the conditional expression (6) to 0.350. On the other hand, when the value goes below the lower limit of the conditional expression (6), the axial sensitivity of the first focusing group G1f in the telephoto end state becomes high, and the fluctuations of the spherical aberration and the coma aberration become large. Can't get In order to ensure the effect of conditional expression (6), it is desirable to set the lower limit of conditional expression (6) to 0.050. In order to further secure the effect of conditional expression (6), it is desirable to set the lower limit value of conditional expression (6) to 0.100.

  The variable power optical system ZL according to the present embodiment has at least one object side lens group (for example, the second lens group G2 in FIG. 1) on the object side of the object side focusing group GfF, At times, it is desirable that the distance between the object side lens group (second lens group G2) and the object side focusing group GfF be changed. By arranging the object-side lens group on the object side of the object-side focusing group GfF, the object-side lens group can collect light rays to the object-side focusing group GfF and can multiply the magnification. The object side lens group GfF can be a relatively simple lens group having a small diameter.

  Further, the variable power optical system ZL according to the present embodiment has at least one negative lens group having negative refractive power on the object side of the object side focusing group GfF (for example, the second lens group G2 in FIG. 1). It is desirable that the distance between the negative lens group (second lens group G2) and the object-side focusing group GfF changes during zooming. By arranging the negative lens group on the object side of the object-side focusing group GfF, it becomes easy to suppress the incident angle of the light beam to the object-side focusing group GfF, so that the amount of field curvature that occurs in the object-side focusing group GfF. Can be made relatively small, and correction in the image-side focusing group GfR can be facilitated.

  Further, the variable power optical system ZL according to the present embodiment has a positive lens group (for example, the first lens group G1 in FIG. 1) having a positive refractive power and a negative refraction on the object side from the object side focusing group GfF. At least one negative lens group having power (for example, the second lens group G2 in FIG. 1) is provided, and at the time of zooming, the positive lens group (first lens group G1) and the negative lens group (second lens group G2). ), And the distance between the negative lens group (second lens group G2) and the object-side focusing group GfF are preferably changed. By arranging the positive lens group further to the object side than the negative lens group described above, the object side and image side focusing groups GfF and GfR can be made relatively small while increasing the zoom ratio, and the focusing speed is fast. can do.

  Further, in the variable power optical system ZL according to the present embodiment, it is desirable that one of the object-side focusing groups GfF be a negative lens having a concave surface facing the object side (for example, the negative meniscus lens L31 in FIG. 1). . With this configuration, it is possible to suppress variations in spherical aberration and field curvature aberration during zooming. In addition, the magnification can be changed efficiently, which leads to downsizing of the lens.

  Further, in the variable power optical system ZL according to the present embodiment, it is desirable that there be one object-side focusing group GfF and one image-side focusing group GfR. With this configuration, it is possible to exert the short-distance performance of off-axis rays with a simple configuration.

  In the variable power optical system ZL according to the present embodiment, it is desirable that the first focusing group Gf1 include a lens (for example, the negative meniscus lens L31 in FIG. 1) that satisfies the following conditional expression (7). .

νd1> 45.0 (7)
However,
νd1: Abbe number for the d-line of the medium of the lens included in the first focusing group Gf1

  By disposing a lens that satisfies the conditional expression (7) in the first focusing group Gf1, it is possible to reduce the chromatic aberration generated in the first focusing group Gf1. If the value is below the lower limit of conditional expression (7), that is, if the lens is made of a medium having a small Abbe number, the number of lenses in the first focus group Gf1 increases in order to perform color correction. In order to ensure the effect of conditional expression (7), it is desirable to set the lower limit value of conditional expression (7) to 48.0. Further, in order to further secure the effect of the conditional expression (7), it is desirable to set the lower limit value of the conditional expression (7) to 50.0. In order to further secure the effect of conditional expression (7), it is desirable to set the lower limit value of conditional expression (7) to 52.0.

  Further, in the variable power optical system ZL according to the present embodiment, the object-side focusing group GfF is one, is composed of one negative lens, and is located at a position facing the object side of the object-side focusing group GfF. Has a negative lens group having a negative refractive power (for example, the second lens group G2 in FIG. 1), and has a positive refractive power at a position facing the image side of the object side focusing group GfF. It is desirable to be configured to have a lens group (for example, the fourth lens group G4 in FIG. 1). With this configuration, it is possible to reduce the change in image magnification of the object-side focusing group GfF.

  Further, in the variable power optical system ZL according to the present embodiment, at the time of variable power, the second focusing group Gf2 and a lens group arranged at a position facing the object side of the second focusing group Gf2 (for example, FIG. Of the second focusing group Gf2 and the lens group (for example, the sixth lens in FIG. 1) arranged at a position facing the image side of the second focusing group Gf2. It is desirable that the distance from the group G6) is variable. With this configuration, it is possible to suppress fluctuations in spherical aberration and field curvature aberration during zooming.

  It should be noted that the conditions and configurations described above each exhibit the effects described above, and are not limited to those satisfying all the conditions and configurations, and any conditions or configurations, or any Even if the conditions or the combination of configurations are satisfied, the respective effects described above can be obtained.

  Next, a camera which is an optical device including the variable power optical system ZL according to the present embodiment will be described with reference to FIG. The camera 1 is a so-called mirrorless camera of an interchangeable lens type, which includes a variable power optical system ZL according to the present embodiment as a taking lens 2. In the camera 1, light from an object (subject) (not shown) is condensed by the taking lens 2 and passes through an OLPF (Optical low pass filter) (not shown) on the image pickup surface of the image pickup section 3. A subject image is formed on. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. This allows the photographer to observe the subject via the EVF 4.

  When a photographer presses a release button (not shown), the image photoelectrically converted by the image pickup unit 3 is stored in a memory (not shown). In this way, the photographer can photograph the subject with the camera 1. In the present embodiment, an example of the mirrorless camera has been described. However, a variable-magnification optical system ZL according to the present embodiment is applied to a single-lens reflex type camera that has a quick return mirror in the camera body and observes an object with a finder optical system. The same effects as those of the camera 1 can be obtained even when the camera is mounted.

  Note that the contents described below can be appropriately adopted within a range that does not impair the optical performance.

  In the present embodiment, the variable power optical system ZL having a configuration of 5 groups, 6 groups, and 7 groups is shown, but the above configuration conditions and the like can be applied to other group configurations such as 4 groups and 8 groups. Further, a configuration in which a lens or a lens group is added to the most object side or a configuration in which a lens or a lens group is added to the most image side may be used. Specifically, a configuration in which a lens group whose position with respect to the image plane is fixed at the time of zooming or focusing is added to the most image side can be considered. In addition, the group may indicate a portion having at least one lens, which is separated by an air gap that changes at least one of zooming, focusing, and contraction. Further, the variable power optical system ZL of the present embodiment uses the first lens group G1 to the fifth lens group G5 (or the sixth lens group G6 and the seventh lens) so that the air space between the respective groups changes during zooming. The groups G7) may each be configured to move along the optical axis. The lens component means a single lens or a cemented lens in which a plurality of lenses are cemented.

  Further, it may be a focusing group in which two or more lens groups, two or more partial lens groups, or the entire optical system is moved in the optical axis direction to focus from an object at infinity to a short-distance object point. In this case, the focusing group can be applied to autofocus, and is also suitable for driving a motor for autofocus (the type of motor is not limited, such as DC motor, stepping motor, voice coil motor). For example, in the case of the above-described 6-group configuration, the third lens group G3 (object-side focusing group GfF) and the fifth lens group G5 (image-side focusing group GfR) are focusing groups, and the other lenses are focusing. It is sometimes preferable to fix the position with respect to the image plane. Considering the load applied to the motor, it is preferable that the focusing lens unit is composed of one or two lens components. Further, it is preferable to dispose at least one lens whose position in the optical axis direction is fixed during focusing between the object-side focusing group GfF and the image-side focusing group GfR.

  Also, the image blur caused by camera shake is corrected by moving the lens group or partial lens group so as to have a displacement component in the direction orthogonal to the optical axis, or by rotating (swinging) in the in-plane direction including the optical axis. It may be an anti-vibration group. In particular, at least a part of the lens group disposed on the image side of the aperture stop S and facing the object side or the image side of the image side focusing group GfR may be used as the image stabilizing lens group. Further, the number of lenses of the image stabilizing lens group is not particularly limited, and may be composed of one single lens or a plurality of lens components.

  Further, the lens surface may be formed as a spherical surface, a flat surface, or an aspherical surface. When the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to processing and assembly adjustment errors can be prevented, which is preferable. Further, even if the image plane is deviated, the drawing performance is less deteriorated, which is preferable. When the lens surface is an aspherical surface, the aspherical surface may be an aspherical surface formed by grinding, a glass mold aspherical surface formed by molding glass into an aspherical shape, or a composite type aspherical surface formed by molding resin into an aspherical surface. Any aspherical surface may be used. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.

  The aperture stop S is preferably arranged between the object-side focusing group GfF and the image-side focusing group GfR. However, the role of the lens frame is used instead of providing a member as the aperture diaphragm. Good. When the first focusing group Gf1 is arranged on the image side of the aperture stop S, a lens whose position in the optical axis direction is fixed during focusing is provided between the aperture stop S and the first focusing group Gf1. It is preferable to arrange at least one.

  Further, an antireflection film may be applied to each lens surface in order to reduce flare and ghost and achieve high optical performance. The antireflection film can be appropriately selected, and the type of the film is not limited, such as a single layer coating, a multilayer film coating, and an antireflection film having an ultra-low refractive index layer made of fine crystal particles. The number of surfaces on which the antireflection film is applied is not particularly limited.

  Hereinafter, the outline of the method for manufacturing the variable power optical system ZL according to the present embodiment will be described with reference to FIG. Note that the description will be given here based on the variable power optical system ZL1 of the 6-group configuration shown in FIG. 1, but the same applies to the case of the 5-group or 7-group configuration. First, each lens is arranged to prepare each of the first lens group G1 to the sixth lens group G6 (step S100), the aperture stop S and the aperture stop S are disposed on the object side, and in the optical axis direction during focusing. At least one object-side focusing group GfF that moves, and at least one image-side focusing group GfR that is arranged on the image side of the aperture stop S and that moves in the optical axis direction during focusing are arranged (step S200). At the time of focusing, the object-side focusing group GfF and the image-side focusing group GfR are arranged so that their movement loci are different (step S300), and one of the object-side focusing group GfF and the image-side focusing group GfR are arranged. When one of them is the first focusing group Gf1 and the other is the second focusing group Gf2, they are arranged so as to satisfy the above-mentioned conditions (step S400).

  Specifically, in the present embodiment, for example, as shown in FIG. 1, a cemented positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are cemented in order from the object side, and an object side. A positive meniscus lens L13 having a convex surface facing toward is arranged to form a first lens group G1, and a negative meniscus lens L21 having a convex surface facing toward the object side, an object-side lens surface, and an image-side lens surface are formed into an aspherical shape. A biconcave lens-shaped aspherical negative lens L22 and a biconvex lens L23 are arranged to form a second lens group G2, and a negative meniscus lens L31 having a concave surface facing the object side is arranged to form a third lens group G3. -Side lens surface and image-side lens surface are formed into an aspherical shape, and a biconvex lens-shaped aspherical positive lens L41, and a cemented negative lens in which a biconvex lens L42 and a biconcave lens L43 are cemented Are arranged to form a fourth lens group G4, and a cemented negative lens in which a biconcave lens L51 and a positive meniscus lens L52 having a convex surface facing the object side are cemented is arranged to form a fifth lens group G5, and an object side lens surface A positive meniscus lens-shaped aspherical lens L61 having a concave surface facing the object side, and a biconvex lens-shaped aspherical lens L62 whose object-side lens surface is aspherical. A cemented positive lens in which a negative meniscus lens L63 having a concave surface facing the object side is cemented, and a negative meniscus lens L64 having a concave surface facing the object side are arranged to form a sixth lens group G6. The aperture stop S is arranged on the most object side of the fourth lens group G4. The third lens group G3 is an object-side focusing group GfF (first focusing group Gf1), and the fifth lens group G5 is an image-side focusing group GfR (second focusing group Gf2). The respective lens groups thus prepared are arranged by the above-described procedure to manufacture the variable power optical system ZL.

  Hereinafter, each example of the present application will be described with reference to the drawings. 1, FIG. 4, FIG. 7, FIG. 10, and FIG. 13 are cross-sectional views showing the configuration and refractive power distribution of the variable power optical system ZL (ZL1 to ZL5) according to each example. Further, in the lower part of the cross-sectional views of these variable power optical systems ZL1 to ZL5, each lens when zooming from the wide-angle end state (W) to the intermediate focal length state (M) to the telephoto end state (T) is performed. Moving directions of the groups G1 to G5 (or G6, G7) along the optical axis, and an object side focusing group GfF and an image side focusing when focusing from an infinity focusing state (∞) to a close focusing state The moving direction along the optical axis of the focal group GfR is indicated by an arrow.

In each example, the height of the aspherical surface in the direction perpendicular to the optical axis is y, and the distance along the optical axis from the tangent plane of the apex of each aspherical surface to the aspherical surface at the height y (sag amount). Is S (y), the radius of curvature of the reference spherical surface (paraxial radius of curvature) is r, the conic constant is K, and the aspherical coefficient of order n is An, expressed by the following equation (a). . In the following examples, 'e-n "denotes" × 10 ^-n ".

S (y) = (y ² / r) / {1+ (1-K × y ² / r ² ) ^1/2 }
^{+ A4 × y 4 + A6 ×} y 6 + A8 × y 8 + A10 × y 10 (a)

  In each embodiment, the quadratic aspherical coefficient A2 is zero. Further, in the tables of the respective examples, an aspherical surface is marked with * on the left side of the surface number.

[First embodiment]
FIG. 1 is a diagram showing a configuration of a variable power optical system ZL1 according to the first example. The variable power optical system ZL1 shown in FIG. 1 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group G2 having a negative refractive power. It is composed of a third lens group G3, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and a sixth lens group G6 having a positive refractive power. .

  In this variable power optical system ZL1, the first lens group G1 has, in order from the object side, a cemented positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are cemented, and a convex surface facing the object side. It is configured to have a positive meniscus lens L13 directed to it. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface directed toward the object side, and a biconcave lens shape in which the object-side lens surface and the image-side lens surface are aspherical. It has a spherical negative lens L22 and a biconvex lens L23. The third lens group G3 includes a negative meniscus lens L31 having a concave surface facing the object side. The fourth lens group G4 includes, in order from the object side, a biconvex lens-shaped aspherical positive lens L41 having an object-side lens surface and an image-side lens surface formed in an aspherical shape, and a biconvex lens L42 and a biconvex lens L42. It has a cemented negative lens cemented with a concave lens L43. The fifth lens group G5 is configured to include a cemented negative lens in which, in order from the object side, a biconcave lens L51 and a positive meniscus lens L52 having a convex surface facing the object side are cemented. The sixth lens group G6 includes, in order from the object side, a positive meniscus lens-shaped aspherical positive lens L61 having a concave surface facing the object side, which has an aspherical lens surface on the object side, and an object-side lens. A cemented positive lens in which a biconvex lens-shaped aspherical positive lens L62 having an aspherical surface and a negative meniscus lens L63 having a concave surface facing the object side are cemented, and a negative meniscus lens having a concave surface facing the object side It is configured to include L64. Further, the aperture stop S is arranged on the object side of the lens surface (15th surface) closest to the object in the fourth lens group G4.

  In this variable power optical system ZL1, upon zooming from the wide-angle end state to the telephoto end state, the air gap between the first lens group G1 and the second lens group G2 increases, and the second lens group G2 and the third lens group G2. The air distance between G3 and G3 increases, the air distance between the third lens group G3 and fourth lens group G4 decreases, the air distance between fourth lens group G4 and fifth lens group G5 increases, and fifth lens Each lens group of the first lens group G1 to the sixth lens group G6 so that the air distance between the group G5 and the sixth lens group G6 decreases and the air distance between the sixth lens group G6 and the image plane I increases. Moves on the optical axis. The aperture stop S moves together with the fourth lens group G4 during zooming.

  Further, in this variable power optical system ZL1, the object-side focusing group GfF is the third lens group G3, the image-side focusing group GfR is the fifth lens group G5, and focusing from an infinite object to a short-distance object is performed. , The first lens group G1, the second lens group G2, the fourth lens group G4, and the sixth lens group G6 are fixed with respect to the image plane I, and the third lens group G3, which is the object-side focusing group GfF, is used as an optical axis. Along the optical axis from the image side to the object side, and the fifth lens group G5, which is the image side focusing group GfR, is moved from the image side to the object side along the optical axis. It should be noted that, in this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are different.

  The values of specifications of the variable power optical system ZL1 according to the first example are listed below. Here, “mm” is generally used as the unit of the focal length f, the radius of curvature r, the surface distance d, and other lengths listed in all the following specification values, but the optical system is proportionally enlarged or proportional. Even if the size is reduced, the same optical performance can be obtained, and the size is not limited to this. Further, the explanation of these reference numerals and the explanation of the specification table are the same in the following examples.

  First, Table 1 shows the overall specifications. In these specifications, f is the focal length of the entire system, FNO is the F number, ω is the half angle of view [°], Y is the maximum image height, TL is the total length, and BF is the back focus value. The values in the wide-angle end state (W), the intermediate focal length state (M), and the telephoto end state (T) are shown. Here, the total length TL indicates the distance on the optical axis from the most object-side lens surface (first surface in FIG. 1) to the image plane I when focusing on infinity. The back focus BF indicates the distance on the optical axis from the most image-side lens surface (29th surface in FIG. 1) to the image surface I when focused on infinity. BF (air) indicates the air-converted length of the back focus.

  Next, Table 2 shows lens data. In the lens data, the first column m is the order (surface number) of the lens surfaces from the object side along the traveling direction of the light beam, the second column r is the radius of curvature of each lens surface, and the third column d. Is the distance on the optical axis from each optical surface to the next optical surface (surface spacing), the fourth column nd and the fifth column νd are the refractive index and Abbe number for the d-line (λ = 587.6 nm). Shows. The radius of curvature 0.00000 indicates a plane, and the refractive index of air 1.0000 is omitted.

  Table 3 shows the lens group focal lengths. In the lens group focal length, g indicates the sign of each lens group, m indicates the starting surface of each lens group (the surface number of the lens surface closest to the object side), and fg indicates the focal length of each lens group.

  In this variable power optical system ZL1, the eighth surface, the ninth surface, the fifteenth surface, the sixteenth surface, the twenty-third surface and the twenty-fifth surface are formed in an aspherical shape. The following Table 4 shows aspherical surface data, that is, the values of the conical constant K and the respective aspherical constants A4 to A10.

  In the variable power optical system ZL1, the axial air distance D5 between the first lens group G1 and the second lens group G2, the axial air distance D11 between the second lens group and the third lens group G3, and the third lens On-axis air distance D13 between the group G3 and the fourth lens group G4, on-axis air distance D19 between the fourth lens group G4 and the fifth lens group G5, and on-axis air between the fifth lens group G5 and the sixth lens group G6 The air distance D22 and the axial air distance D29 (corresponding to the back focus BF) between the sixth lens group G6 and the image plane I change during zooming and focusing. Table 5 below shows the variable intervals in the in-focus state of the object at infinity and the in-focus state of the close distance. In Table 5, Infinite indicates the infinity in-focus state, and Closest indicates the close-up in-focus state. Further, W indicates the wide-angle end state, M indicates the intermediate focal length state, and T indicates the telephoto end state. Further, D0 indicates the distance from the most object side surface (first surface) of the variable power optical system ZL1 to the object, β indicates the photographing magnification, and f indicates the focal length of the entire system.

  Table 6 below shows values corresponding to the conditional expressions in the variable power optical system ZL1. In this conditional expression corresponding value, ff1 is the focal length of the first focusing group Gf1, ff2 is the focal length of the second focusing group Gf2, and FZ1W is the first focusing group in the wide-angle end state and the infinity focusing state. The fluctuation amount [mm] of the on-axis focusing position when Gf1 moves 1 [mm] in the optical axis direction, the FZ1T is the first focusing group Gf1 in the optical axis direction in the telephoto end state and the infinity focusing state. The amount of variation [mm] of the on-axis focusing position when moved by 1 [mm], the second focusing group Gf2 is moved by 1 [mm] in the optical axis direction when the FZ2W is in the wide-angle end state and the infinity focusing state. FZ2T is the amount of variation [mm] of the on-axis focusing position when the second focusing group Gf2 moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. The variation amount [mm] of the focal position, νd1 is the medium of the lens included in the first focusing group Gf1. Represent respectively the Abbe number for the line. In the first embodiment, the first focusing group Gf1 corresponds to the third lens group G3 that is the object-side focusing group GfF, and the second focusing group Gf2 is the image-side focusing group GfR. The fifth lens group G5 corresponds to this. Further, νd1 is a value of the negative meniscus lens L31 of the third lens group G3 which is the first focusing group Gf1.

  As described above, the variable power optical system ZL1 according to the first example satisfies the conditional expressions (1) to (3), (5) and (3 ′), (6) and (7).

  A spherical aberration diagram, an astigmatism diagram, a distortion diagram, a chromatic aberration diagram of magnification, and a wide-angle end state, an intermediate focal length state, and a telephoto end state of the variable power optical system ZL1 in the infinity focus state and the close-up focus state. Transverse aberration diagrams are shown in FIGS. 2 and 3. In each aberration diagram, FNO is an F number, NA is a numerical aperture, and Y is an image height. In the spherical aberration diagram, the F number or numerical aperture value corresponding to the maximum aperture is shown, in the astigmatism diagram and the distortion diagram, the maximum image height is shown, and in the transverse aberration diagram, the image height value is shown. ing. Further, d represents a d-line (λ = 587.6 nm), and g represents a g-line (λ = 435.8 nm). In the astigmatism diagram, the solid line shows the sagittal image plane and the broken line shows the meridional image plane. Further, the distortion diagram shows the value of the d line. Also, in the aberration diagrams of the respective examples shown below, the same reference numerals as in the present example are used. From these aberration diagrams, this variable power optical system ZL1 corrects various aberrations from the infinity object focus state to the close focus state during focusing, and from the wide angle end state to the telephoto end state during zooming. You can see that it is done.

[Second Embodiment]
FIG. 4 is a diagram showing the configuration of the variable power optical system ZL2 according to the second example. The variable power optical system ZL2 shown in FIG. 4 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group G2 having a negative refractive power. It is composed of a third lens group G3, a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and a sixth lens group G6 having a positive refractive power. .

  In this variable power optical system ZL2, the first lens group G1 includes, in order from the object side, a cemented positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are cemented, and a convex surface facing the object side. It is configured to have a positive meniscus lens L13 directed to it. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave lens-shaped aspherical negative lens L22 having an aspherical lens surface on the object side, and , And has a biconvex lens L23. The third lens group G3 includes a cemented negative lens in which a biconcave lens L31 and a biconvex lens L32 are cemented in order from the object side. The fourth lens group G4 includes, in order from the object side, a biconvex lens-shaped aspherical positive lens L41 having an object-side lens surface and an image-side lens surface formed in an aspherical shape, and a biconvex lens L42 and a biconvex lens L42. It is configured to have a cemented positive lens in which the concave lens L43 is cemented. The fifth lens group G5 is configured to include a cemented negative lens in which, in order from the object side, a biconcave lens L51 and a positive meniscus lens L52 having a convex surface facing the object side are cemented. In the sixth lens group G6, the object-side lens surface is formed in an aspherical shape in order from the object side, and a positive meniscus lens-shaped aspherical positive lens L61 having a concave surface facing the object side and a concave surface facing the object side are formed. A cemented positive lens cemented with a negative meniscus lens L62 directed to it, a cemented positive lens cemented with a biconvex lens L63 and a negative meniscus lens L64 having a concave surface facing the object side, a positive meniscus lens L65 having a concave surface facing the object side, and , And has a biconcave lens L66. Further, the aperture stop S is arranged on the object side of the lens surface (sixteenth surface) closest to the object side of the fourth lens group G4.

  In this variable power optical system ZL2, during zooming from the wide-angle end state to the telephoto end state, the air gap between the first lens group G1 and the second lens group G2 increases, and the second lens group G2 and the third lens group G2. The air distance between G3 and G3 increases, the air distance between the third lens group G3 and fourth lens group G4 decreases, the air distance between fourth lens group G4 and fifth lens group G5 increases, and fifth lens Each lens group of the first lens group G1 to the sixth lens group G6 so that the air distance between the group G5 and the sixth lens group G6 decreases and the air distance between the sixth lens group G6 and the image plane I increases. Moves on the optical axis. The aperture stop S moves together with the fourth lens group G4 during zooming.

  Further, in this variable power optical system ZL2, the object side focusing group GfF is the third lens group G3, the image side focusing group GfR is the fifth lens group G5, and focusing from an object at infinity to a short distance object is performed. , The first lens group G1, the second lens group G2, the fourth lens group G4, and the sixth lens group G6 are fixed with respect to the image plane I, and the third lens group G3, which is the object-side focusing group GfF, is used as an optical axis. Along the optical axis from the image side to the object side, and the fifth lens group G5, which is the image side focusing group GfR, is moved from the image side to the object side along the optical axis. It should be noted that, in this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are different.

  The values of specifications of the variable power optical system ZL2 according to the second example are listed below. First, Table 7 shows the overall specifications.

  Next, Table 8 shows lens data in the second embodiment.

  Table 9 shows the lens group focal lengths in the second embodiment.

  In this variable power optical system ZL2, the eighth surface, the sixteenth surface, the seventeenth surface and the twenty-fourth surface are formed in an aspherical shape. The following Table 10 shows aspherical surface data, that is, the values of the conical constant K and the respective aspherical surface constants A4 to A10.

  In the variable power optical system ZL2, the axial air distance D5 between the first lens group G1 and the second lens group G2, the axial air distance D11 between the second lens group and the third lens group G3, and the third lens On-axis air distance D14 between the group G3 and the fourth lens group G4, On-axis air distance D20 between the fourth lens group G4 and the fifth lens group G5, On-axis air between the fifth lens group G5 and the sixth lens group G6 The air distance D23 and the axial air distance D33 (corresponding to the back focus BF) between the sixth lens group G6 and the image plane I change during zooming and focusing. Table 11 below shows variable distances in the in-focus state of the object at infinity and in the close-focus state.

  Table 12 below shows values corresponding to the conditional expressions in the variable power optical system ZL2. In the second embodiment, the first focus group Gf1 corresponds to the third lens group G3 that is the object side focus group GfF, and the second focus group Gf2 is the image side focus group GfR. The fifth lens group G5 corresponds to this. Further, νd1 is a value of the biconcave lens L31 of the third lens group G3 which is the first focusing group Gf1.

  As described above, the variable power optical system ZL2 according to the second example satisfies the conditional expressions (1) to (3), (5) and (3 ′), (6) and (7).

  A spherical aberration diagram, an astigmatism diagram, a distortion diagram, a lateral chromatic aberration diagram of a wide-angle end state, an intermediate focal length state, and a telephoto end state of the variable power optical system ZL2 in the infinity focused state and the close-up focused state. Transverse aberration diagrams are shown in FIGS. 5 and 6. From these aberration diagrams, this variable power optical system ZL2 corrects various aberrations from the infinity object focus state to the close focus state during focusing, and from the wide angle end state to the telephoto end state during zooming. You can see that it is done.

[Third Embodiment]
FIG. 7 is a diagram showing a configuration of a variable power optical system ZL3 according to the third example. The variable power optical system ZL3 shown in FIG. 7 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a first lens group G2 having a positive refractive power. It is composed of a third lens group G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

  In the variable power optical system ZL3, the first lens group G1 is a cemented positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side are cemented in order from the object side. Is configured. The second lens group G2 includes, in order from the object side, a negative meniscus lens L21 having a convex surface facing the object side, and an object-side lens surface having an aspherical shape, and a negative meniscus lens shape having a convex surface facing the object side. The aspherical negative lens L22, the biconvex lens L23, and the biconcave lens-shaped aspherical negative lens L24 having an aspherical image-side lens surface. The third lens group G3 includes, in order from the object side, a biconvex lens-shaped aspherical positive lens L31 in which the object-side lens surface and the image-side lens surface are formed in an aspherical shape, a biconvex lens L32, and an object side lens. A cemented positive lens cemented with a negative meniscus lens L33 having a concave surface, a cemented positive lens cemented with a biconcave lens L34 and a positive meniscus lens L35 having a convex surface facing the object side, and a lens surface on the object side and an image side. It has a biconvex lens-shaped aspherical positive lens L36 whose lens surface is formed in an aspherical shape. The fourth lens group G4 is configured to include an aspherical negative lens L41 having a negative meniscus lens shape with an image-side lens surface formed in an aspherical shape and having a convex surface facing the object side. The fifth lens group G5 includes a biconvex lens-shaped aspherical positive lens L51 having an aspherical surface on the object side. Further, the aperture stop S is arranged between the aspherical positive lens L31 and the biconvex lens L32 of the third lens group G3. A filter FL is arranged between the fifth lens group G5 and the image plane I.

  In this variable power optical system ZL3, during zooming from the wide-angle end state to the telephoto end state, the air gap between the first lens group G1 and the second lens group G2 increases, and the second lens group G2 and the third lens group G2. The air gap with G3 decreases, the air gap between the third lens group G3 and the fourth lens group G4 increases, the air gap between the fourth lens group G4 and the fifth lens group G5 increases, and the fifth lens Each lens group from the first lens group G1 to the fifth lens group G5 moves on the optical axis so that the air gap between the group G5 and the filter FL decreases. The aperture stop S moves together with the third lens group G3 during zooming.

  Further, in this variable power optical system ZL3, the object side focusing group GfF is the second lens group G2, the image side focusing group GfR is the fourth lens group G4, and focusing from an object at infinity to a short distance object is performed. , The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed with respect to the image plane I, and the second lens group G2, which is the object-side focusing group GfF, is fixed from the image side along the optical axis. The fourth lens group G4, which is the image-side focusing group GfR, is moved to the object side and is moved from the object side to the image side along the optical axis. It should be noted that, in this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are different.

  The values of specifications of the variable power optical system ZL3 according to the third example are listed below. First, Table 13 shows the overall specifications.

  Next, Table 14 shows lens data in the third example.

  Table 15 shows the lens group focal lengths in the third example.

  In the variable power optical system ZL3, the sixth surface, the eleventh surface, the twelfth surface, the thirteenth surface, the twenty-first surface, the twenty-second surface, the twenty-fourth surface and the twenty-fifth surface are formed in an aspherical shape. The following Table 16 shows aspherical surface data, that is, the values of the conical constant K and the respective aspherical constants A4 to A10.

  In the variable power optical system ZL3, an axial air distance D3 between the first lens group G1 and the second lens group G2, an axial air distance D11 between the second lens group and the third lens group G3, and a third lens An axial air distance D22 between the group G3 and the fourth lens group G4, an axial air distance D24 between the fourth lens group G4 and the fifth lens group G5, and an axial air distance between the fifth lens group G5 and the filter FLI. The distance D26 changes during zooming and focusing. Table 17 below shows variable intervals in the in-focus state of the object at infinity and in the close-focus state.

  Table 18 below shows values corresponding to the conditional expressions in the variable power optical system ZL3. In the third embodiment, the first focusing group Gf1 corresponds to the second lens group G2 which is the object side focusing group GfF, and the second focusing group Gf2 is the image side focusing group GfR. The fourth lens group G4 corresponds to this. Further, νd1 is the value of the negative meniscus lens L21 of the second lens group G2 which is the first focusing group Gf1.

  As described above, the variable power optical system ZL3 according to the third example satisfies the conditional expressions (1) to (3), (5) and (3 '), (6) and (7).

  A spherical aberration diagram, an astigmatism diagram, a distortion diagram, a lateral chromatic aberration diagram of a wide-angle end state, an intermediate focal length state, and a telephoto end state of the variable power optical system ZL3 in the infinity focused state and the close-up focused state. Transverse aberration diagrams are shown in FIGS. 8 and 9. From these aberration diagrams, this variable power optical system ZL3 corrects various aberrations from the infinity object focus state to the close focus state during focusing, and from the wide angle end state to the telephoto end state during zooming. You can see that it is done.

[Fourth Embodiment]
FIG. 10 is a diagram showing the configuration of a variable power optical system ZL4 according to the fourth example. The variable power optical system ZL4 shown in FIG. 10 includes, in order from the object side, a first lens group G1 having a negative refractive power, a second lens group G2 having a negative refractive power, and a second lens group G2 having a positive refractive power. It is composed of a third lens group G3, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

  In this variable power optical system ZL4, the first lens group G1 includes, in order from the object side, a negative meniscus lens L11 having a convex surface directed toward the object side, an object-side lens surface formed in an aspherical shape, and a convex surface directed toward the object side. A negative meniscus lens-shaped aspherical negative lens L12 and a biconvex lens L13. In the second lens group G2, the lens surface on the object side is formed in an aspherical shape in order from the object side, and a negative meniscus lens-shaped aspherical negative lens L21 having a concave surface facing the object side and a concave surface on the object side are formed. It is configured to have a cemented negative lens that is cemented with the positive meniscus lens L22 facing the lens. In the third lens group G3, the object-side lens surface and the image-side lens surface are formed in an aspherical shape in order from the object side, and the positive meniscus lens-shaped aspherical positive lens L31 having a convex surface facing the object side. , And a cemented positive lens in which a biconvex lens L32 and a biconcave lens L33 are cemented. The fourth lens group G4 is configured to include a cemented negative lens in which, in order from the object side, a biconcave lens L41 and a positive meniscus lens L42 having a convex surface facing the object side are cemented. In the fifth lens group G5, the object-side lens surface is formed into an aspherical shape, and a negative meniscus lens-shaped aspherical negative lens L51 having a convex surface facing the object side and a positive meniscus lens having a convex surface facing the object side. It is configured to have a cemented negative lens cemented with L52, a cemented positive lens cemented with a biconvex lens L53 and a negative meniscus lens L54 having a concave surface facing the object side, a biconvex lens L55, and a biconcave lens L56. Further, the aperture stop S is arranged on the object side of the lens surface (11th surface) closest to the object of the third lens group G3.

  In this variable power optical system ZL4, during zooming from the wide-angle end state to the telephoto end state, the air gap between the first lens group G1 and the second lens group G2 increases, and the second lens group G2 and the third lens group G3. , The air distance between the third lens group G3 and the fourth lens group G4 increases, the air distance between the fourth lens group G4 and the fifth lens group G5 decreases, and the fifth lens group G5 and the image Each lens group from the first lens group G1 to the fifth lens group G5 moves on the optical axis so that the air gap on the surface I increases. The aperture stop S moves together with the third lens group G3 during zooming.

  Further, in this variable power optical system ZL4, the object side focusing group GfF is the second lens group G2, the image side focusing group GfR is the fourth lens group G4, and focusing from an object at infinity to a short distance object is performed. , The first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed with respect to the image plane I, and the second lens group G2, which is the object-side focusing group GfF, is fixed from the image side along the optical axis. The fourth lens group G4, which is the image-side focusing group GfR, is moved from the image side to the object side along the optical axis. It should be noted that, in this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are different.

  The values of specifications of the variable power optical system ZL4 according to the fourth example are listed below. First, Table 19 shows the overall specifications.

  Next, Table 20 shows lens data in the fourth example.

  Table 21 shows the lens group focal lengths in the fourth example.

  In the variable power optical system ZL4, the third surface, the seventh surface, the eleventh surface, the twelfth surface, and the nineteenth surface are formed in an aspherical shape. The following Table 22 shows aspherical surface data, that is, the values of the conical constant K and the respective aspherical surface constants A4 to A10.

  In the variable power optical system ZL4, the axial air distance D6 between the first lens group G1 and the second lens group G2, the axial air distance D9 between the second lens group and the third lens group G3, and the third lens On-axis air distance D15 between the group G3 and the fourth lens group G4, on-axis air distance D18 between the fourth lens group G4 and the fifth lens group G5, and on-axis between the fifth lens group G5 and the image plane I. The air gap D28 (corresponding to the back focus BF) changes during zooming and focusing. Table 23 below shows the variable intervals in the in-focus state of the object at infinity and in the close-focus state.

  Table 24 below shows values corresponding to the conditional expressions in the variable power optical system ZL4. In the fourth embodiment, the first focusing group Gf1 corresponds to the second lens group G2 that is the object-side focusing group GfF, and the second focusing group Gf2 is the image-side focusing group GfR. The fourth lens group G4 corresponds to this. Further, νd1 is a value of the aspherical negative lens L21 of the second lens group G2 which is the first focusing group Gf1.

  As described above, the variable power optical system ZL4 according to the fourth example satisfies the conditional expressions (1) to (3), (5) and (3 '), (6) and (7).

  A spherical aberration diagram, an astigmatism diagram, a distortion diagram, a lateral chromatic aberration diagram of a wide-angle end state, an intermediate focal length state, and a telephoto end state of this variable power optical system ZL4 in an infinite focus state and a close focus state. Transverse aberration diagrams are shown in FIGS. 11 and 12. From these aberration diagrams, this variable power optical system ZL4 corrects various aberrations from the infinity object focus state to the close focus state during focusing, and from the wide angle end state to the telephoto end state during zooming. You can see that it is done.

[Fifth Embodiment]
FIG. 13 is a diagram showing the configuration of the variable power optical system ZL5 according to the fifth example. The variable power optical system ZL5 shown in FIG. 13 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a second lens group G2 having a negative refractive power. The third lens group G3, the fourth lens group G4 having a positive refracting power, the fifth lens group G5 having a positive refracting power, the sixth lens group G6 having a negative refracting power, and the negative refracting power are It has a seventh lens group G7 which has.

  In the variable power optical system ZL5, the first lens group G1 includes, in order from the object side, a cemented positive lens in which a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12 are cemented, and a convex surface facing the object side. It is configured to have a positive meniscus lens L13 directed to it. The second lens group G2 cements, in order from the object side, a cemented positive lens in which a biconvex lens L21 and a biconcave lens L22 are cemented, and a biconcave lens L23 and a positive meniscus lens L24 having a convex surface facing the object side. It has a cemented negative lens. The third lens group G3 includes a negative meniscus lens L31 having a concave surface facing the object side. The fourth lens group G4 includes, in order from the object side, a biconvex lens L41, a cemented positive lens in which a biconcave lens L42 and a biconvex lens L43 are cemented, and a positive meniscus lens L44 having a concave surface facing the object side and an object side. It is configured to have a cemented negative lens in which a negative meniscus lens L45 having a concave surface is cemented. In the fifth lens group G5, a cemented negative lens in which a biconvex lens L51 and a biconcave lens L52 are cemented in order from the object side, and a lens surface on the object side and a lens surface on the image side are formed in an aspherical shape. It has an aspherical positive lens L53 having a biconvex lens shape. In the sixth lens group G6, the object-side lens surface is formed in an aspherical shape in order from the object side, and a negative meniscus lens-shaped aspherical negative lens L61 having a convex surface facing the object side and a convex surface facing the object side are provided. It is configured to have a cemented negative lens cemented with a positive meniscus lens L62 directed to it, and a biconvex lens L63. The seventh lens group G7 is configured to include, in order from the object side, a cemented negative lens in which a positive meniscus lens L71 having a convex surface facing the object side and a negative meniscus lens L72 having a convex surface facing the object side are cemented. ing. Further, the aperture stop S is arranged on the object side of the lens surface (15th surface) closest to the object in the fourth lens group G4. A filter FL is arranged between the seventh lens group G7 and the image plane I.

  In this variable power optical system ZL5, during zooming from the wide-angle end state to the telephoto end state, the air gap between the first lens group G1 and the second lens group G2 increases, and the second lens group G2 and the third lens group G2. The air distance between G3 and G3 decreases, the air distance between the third lens group G3 and fourth lens group G4 decreases, the air distance between fourth lens group G4 and fifth lens group G5 changes, and fifth lens Each of the first lens group G1 to the sixth lens group G6 is arranged so that the air gap between the group G5 and the sixth lens group G6 changes and the air gap between the sixth lens group G6 and the seventh lens group G7 changes. The lens group moves on the optical axis. At this time, the seventh lens group G7 is fixed with respect to the image plane I. The aperture stop S moves together with the fourth lens group G4 during zooming.

  Further, in this variable power optical system ZL5, the object side focusing group GfF is the third lens group G3, the image side focusing group GfR is the fifth lens group G5, and focusing from an object at infinity to a short distance object is performed. , The first lens group G1, the second lens group G2, the fourth lens group G4, the sixth lens group G6, and the seventh lens group G7 are fixed with respect to the image plane I, and are the object-side focusing group GfF. The lens group G3 is moved from the image side to the object side along the optical axis, and the fifth lens group G5, which is the image side focusing group GfR, is moved from the image side to the object side along the optical axis. It is configured. It should be noted that, in this focusing, the movement loci of the object-side focusing group GfF and the image-side focusing group GfR are different.

  The values of specifications of the variable power optical system ZL5 according to the fifth example are listed below. First, Table 25 shows the overall specifications.

  Next, Table 26 shows lens data in the fifth example.

  Further, Table 27 shows the lens group focal lengths in the fifth example.

  In the variable power optical system ZL5, the 26th surface, the 27th surface and the 28th surface are formed in an aspherical shape. The following Table 28 shows aspherical surface data, that is, the values of the conical constant K and the respective aspherical surface constants A4 to A10.

  In the variable power optical system ZL5, the axial air distance D5 between the first lens group G1 and the second lens group G2, the axial air distance D11 between the second lens group and the third lens group G3, and the third lens On-axis air distance D13 between group G3 and fourth lens group G4, on-axis air distance D22 between fourth lens group G4 and fifth lens group G5, on-axis air between fifth lens group G5 and sixth lens group G6 The air gap 27 and the axial air gap D32 between the sixth lens group G6 and the seventh lens group G7 change during zooming and focusing. Table 29 below shows variable intervals in the in-focus state of the object at infinity and in the close-focus state.

  Table 30 below shows values corresponding to each conditional expression in the variable power optical system ZL5. In the fifth embodiment, the first focusing group Gf1 corresponds to the fifth lens group G5 which is the image-side focusing group GfR, and the second focusing group Gf2 is the object-side focusing group GfF. The third lens group G3 corresponds to this. Further, νd1 is a value of the aspherical positive lens L53 of the fifth lens group G5 which is the first focusing group Gf1.

  Thus, the variable power optical system ZL5 according to the fifth example satisfies the above conditional expressions (1), (2), (4) to (7).

  A spherical aberration diagram, an astigmatism diagram, a distortion diagram, a chromatic aberration diagram of magnification, and a wide-angle end state, an intermediate focal length state, and a telephoto end state of the variable power optical system ZL5 in an infinite focus state and a close-up focus state. Transverse aberration diagrams are shown in FIGS. 14 and 15. From these aberration diagrams, this variable power optical system ZL5 corrects various aberrations from the infinity object focus state to the close focus state during focusing, and from the wide angle end state to the telephoto end state during zooming. You can see that it is done.

1 Camera (optical equipment) ZL (ZL1 to ZL5) Variable magnification optical system GfF Object side focusing group S Aperture stop GfR Image side focusing group Gf1 First focusing group Gf2 Second focusing group

Claims (20)

A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
When one of the one of the object-side focusing group and one of the image-side focusing groups is the first focusing group and the other is the second focusing group, the condition of the following expression should be satisfied. Characteristic variable power optical system.
｜ ff1 / ff2 ｜ < 0.800
0.010 <| FZ2T / FZ1T | <1.000
0.699 ≤ | FZ2W / FZ2T | <0.950
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 mm in the optical axis direction in the telephoto end state and the infinity focusing state Amount of variation of on-axis focusing position when [mm]
FZ2W: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Variation amount [mm] of the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
When one of the one of the object-side focusing group and one of the image-side focusing groups is the first focusing group and the other is the second focusing group, the condition of the following expression should be satisfied. Characteristic variable power optical system.
| Ff1 / ff2 | <1,000
0.010 <| FZ2T / FZ1T | <1.000
0.764 ≤ | FZ2W / FZ2T | <0.950
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 mm in the optical axis direction in the telephoto end state and the infinity focusing state Amount of variation of on-axis focusing position when [mm]
FZ2W: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Variation amount [mm] of the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
When one of the one of the object-side focusing group and one of the image-side focusing groups is the first focusing group and the other is the second focusing group, the condition of the following equation is satisfied ,
｜ ff1 / ff2 ｜ < 0.700
0.010 <| FZ2T / FZ1T | <1.000
0.050 <| FZ2W / FZ2T | <0.950
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 mm in the optical axis direction in the telephoto end state and the infinity focusing state Amount of variation of on-axis focusing position when [mm]
FZ2W: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Variation amount [mm] of the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state.
The variable power optical system, wherein the first focusing unit has a lens satisfying the following condition .
νd1> 45.0
However,
νd1: Abbe number for the d-line of the medium of the lens included in the first focusing group A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
The object-side focusing unit is one, and is composed of one negative lens,
A negative lens group having a negative refractive power is provided at a position facing the object side of the object side focusing group,
A positive lens group having a positive refractive power is provided at a position facing the image side of the object side focusing group,
When one of the one of the object-side focusing group and one of the image-side focusing groups is the first focusing group and the other is the second focusing group, the condition of the following expression should be satisfied. Characteristic variable power optical system.
｜ ff1 / ff2 ｜ < 0.700
0.010 <| FZ2T / FZ1T | <1.000
0.050 <| FZ2W / FZ2T | <0.950
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 mm in the optical axis direction in the telephoto end state and the infinity focusing state Amount of variation of on-axis focusing position when [mm]
FZ2W: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Variation amount [mm] of the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
When one of the one of the object-side focusing group and one of the image-side focusing groups is the first focusing group and the other is the second focusing group, the condition of the following expression should be satisfied. Characteristic variable power optical system.
| Ff1 / ff2 | <1,000
0.010 <| FZ2T / FZ1T | <1.000
0.050 <| FZ2W / FZ2T | <0.950
ff1> 0
However,
ff1: Focal length of the first focusing group ff2: Focal length of the second focusing group FZ1T: The first focusing group moves 1 mm in the optical axis direction in the telephoto end state and the infinity focusing state Amount of variation of on-axis focusing position when [mm]
FZ2W: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Variation amount [mm] of the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
When one of the image-side focusing groups is a first focusing group and one of the object-side focusing groups is a second focusing group, the following formula is satisfied. Optical system.
｜ ff1 / ff2 ｜ < 0.800
0.699 ≤ | FZ2W / FZ2T | <0.950
However,
ff1: focal length of the first focusing group ff2: focal length of the second focusing group
FZ2W: Amount of variation [mm] in the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and infinity focusing state
FZ2T: Variation amount [mm] of the axial focusing position when the second focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
On the object side of the object side focusing group, at least one positive lens group having a positive refractive power and at least one negative lens group having a negative refractive power are provided,
During zooming, the distance between the positive lens group and the negative lens group, and the distance between the negative lens group and the object-side focusing group changes,
When one of the image-side focusing groups is the first focusing group and one of the object-side focusing groups is the second focusing group, the condition of the following equation is satisfied ,
| Ff1 / ff2 | <1,000
However,
ff1: focal length of the first focusing group ff2: focal length of the second focusing group
The variable power optical system, wherein the first focusing unit has a lens satisfying the following condition.
νd1> 45.0
However,
νd1: Abbe number for the d-line of the medium of the lens included in the first focusing group A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
On the object side of the object side focusing group, at least one positive lens group having a positive refractive power and at least one negative lens group having a negative refractive power are provided,
During zooming, the distance between the positive lens group and the negative lens group, and the distance between the negative lens group and the object-side focusing group changes,
The object-side focusing unit is one, and is composed of one negative lens,
A negative lens group having a negative refractive power is provided at a position facing the object side of the object side focusing group,
A positive lens group having a positive refractive power is provided at a position facing the image side of the object side focusing group,
When one of the image-side focusing groups is a first focusing group and one of the object-side focusing groups is a second focusing group, the following formula is satisfied. Optical system.
| Ff1 / ff2 | <1,000
However,
ff1: focal length of the first focusing group ff2: focal length of the second focusing group A variable power optical system having a plurality of lens groups, wherein the distance between the lens groups changes during zooming,
An aperture stop,
At least one object-side focusing group that is arranged on the object side of the aperture stop and moves in the optical axis direction when focusing;
And at least one image-side focusing unit that is disposed on the image side of the aperture stop and moves in the optical axis direction when focusing,
At the time of focusing, the movement trajectories of the object-side focusing group and the image-side focusing group are different,
On the object side of the object side focusing group, at least one positive lens group having a positive refractive power and at least one negative lens group having a negative refractive power are provided,
During zooming, the distance between the positive lens group and the negative lens group, and the distance between the negative lens group and the object-side focusing group changes,
When one of the image-side focusing groups is a first focusing group and one of the object-side focusing groups is a second focusing group, the following formula is satisfied. Optical system.
| Ff1 / ff2 | <1,000
ff1> 0
However,
ff1: focal length of the first focusing group ff2: focal length of the second focusing group On the object side of the object side focusing group, at least one positive lens group having a positive refractive power and at least one negative lens group having a negative refractive power are provided,
Upon zooming, the interval between the positive lens group and the negative lens group, and any one of claims 1 to 6, characterized in that the distance between the negative lens the object-side focus group and units vary one A variable power optical system described in the item . The variable power optical system according to any one of claims 1, 2, 4, 5, 6, 8, and 9, wherein the first focusing group includes a lens satisfying the following condition. .
νd1> 45.0
However,
νd1: Abbe number for the d-line of the medium of the lens included in the first focusing group The object-side focusing unit is one, and is composed of one negative lens,
A negative lens group having a negative refractive power is provided at a position facing the object side of the object side focusing group,
Any one of claims 1,2,3,5,6,7,9 a position facing the image side of the object-side focusing lens group, characterized by having a positive lens group having a positive refractive power A variable power optical system described in the item .   The variable power optical system according to any one of claims 1, 2, 3, 4, and 6, which satisfies the following condition.
ff1> 0
  However,
  ff1: focal length of the first focusing group 14. The variable power optical system according to claim 1, wherein the condition of the following expression is satisfied.
0.010 <| FZ1W / FZ1T | <1.500
However,
FZ1W: Variation amount [mm] of the axial focusing position when the first focusing unit moves 1 [mm] in the optical axis direction in the wide-angle end state and the infinity focusing state
FZ1T: Amount of variation [mm] in the on-axis focusing position when the first focusing unit moves 1 [mm] in the optical axis direction in the telephoto end state and the infinity focusing state. On the object side from the object-side focusing group, at least one object-side lens group,
Upon zooming, zooming optical system according to any one of claims 1 to 14, characterized in that the distance between the object-side lens group and the object side focusing lens group is changed. On the object side of the object side focusing group, at least one negative lens group having a negative refractive power,
16. The variable power optical system according to claim 1, wherein the distance between the negative lens group and the object-side focusing group changes during zooming. 17. The variable power optical system according to claim 1, wherein one of the object-side focusing groups is composed of a negative lens having a concave surface facing the object side. 18. The variable power optical system according to claim 1, wherein each of the object side focusing group and the image side focusing group is one. At the time of zooming, the distance between the second focusing group and the lens group disposed at the position facing the object side of the second focusing group changes, and the second focusing group and the second focusing group are changed. The variable power optical system according to any one of claims 1 to 18, wherein a distance between the lens group and a lens group disposed at a position facing the image side is changed.   20. The variable power optical system according to claim 1, which satisfies the condition of the following equation.
ff2 <0
  However,
  ff2: focal length of the second focusing group