JP5848099B2 - Inner focus type large aperture telephoto macro lens with anti-vibration function - Google Patents

Description

  The present invention is particularly suitable for a digital camera, a silver salt camera, a video camera, and the like, and can be photographed at a high magnification of 1: 2 or more, has an angle of view of 15 ° or less, and an F value of about F2.9. The present invention relates to an inner focus type large-aperture telephoto macro lens having an anti-vibration function.

  In an inner focus type macro lens having an anti-vibration function, in order to suppress the outer diameter of the product, it is necessary to reduce the lens diameter of the anti-vibration group and the movement amount of the anti-vibration group during anti-vibration.

  On the other hand, the effect of camera shake increases as the macro lens approaches the same magnification, so in order to obtain the necessary vibration isolation effect on the same magnification side while suppressing the outer diameter of the product and the movement amount of the vibration isolation group, It is necessary to increase the ratio of the image blur correction amount on the image plane to the unit movement amount of the group (hereinafter referred to as an image stabilization coefficient).

  Examples of the telephoto macro lens having an image stabilization function and an angle of view of 15 ° or less include the following patent documents.

Japanese Patent No. 4467920 Japanese Patent No. 3428209 US Pat. No. 5,825,546

  However, the optical system described in Patent Document 1 avoids an increase in the outer diameter due to a large aperture because the optical system performs vibration isolation in a part of the most object side group having a relatively large axial luminous flux. Is difficult. In addition, since the anti-vibration coefficient is small, it is necessary to increase the amount of movement of the anti-vibration lens group at the time of anti-vibration, thereby causing an increase in the size of the anti-vibration unit and increasing the product outer diameter.

  In addition, the optical systems described in Patent Documents 2 and 3 have a relatively small axial light beam, and perform vibration isolation with a part of the most image surface side group that is fixed with respect to the image surface at the time of focusing. Therefore, it is advantageous in terms of diameter, but since the anti-vibration coefficient is small, it is necessary to increase the amount of movement of the anti-vibration lens group during anti-vibration. There was a problem that would increase.

  Therefore, the present invention provides an inner focus type large-aperture telephoto macro lens having an image stabilization function capable of solving the above-described problems and obtaining good optical performance by means described below.

In order from the object side to the image plane side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a positive The fourth lens unit L4 having a refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power, are arranged to convert an object from infinity to a close object. At the time of focusing, the second lens unit L2 moves to the image plane side and at the same time, the third lens unit L3 moves to the object side, and the first lens unit L1, the fourth lens unit L4, and the fifth lens. The group L5 and the sixth lens group L6 are fixed with respect to the image plane, and the image is moved in the direction perpendicular to the optical axis by moving the fifth lens group L5 in a direction substantially perpendicular to the optical axis. have a stabilization function, characterized in that it is possible to, the following conditional expression (3) And characterized in that the foot

(3) 0.34 <| f2 / f | <0.97

Here, f is the focal length of the entire lens system when focusing on infinity, and f2 is the focal length of the second lens unit L2.

The inner focus type large-aperture telephoto macro lens having the second image stabilization function according to the present invention has a first lens unit L1 having a positive refractive power and a negative refractive power in order from the object side to the image surface side. A second lens unit L2 having a positive refractive power, a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, and a positive refraction. consists sixth lens unit L6 and having a force, when from infinity focusing to a close object, the second said lens unit L2 at the same time moved to the image side a third lens unit L3 is an object The first lens unit L1, the fourth lens unit L4, the fifth lens unit L5, and the sixth lens unit L6 are fixed with respect to the image plane, and light is transmitted through the fifth lens unit L5. vertical image with respect to the optical axis by moving in a direction substantially perpendicular to the axis Have a stabilization function, characterized in that it is possible to move to the direction, the following conditional expressions (1), characterized by satisfying the expression (2) and (3).

(1) 0.38 <f1 / f <1.00
(2) 3.33 <β2 <8.79
(3) 0.34 <| f2 / f | <0.97

Where f1 is the focal length of the first lens unit L1, f is the focal length of the entire lens system when focusing on infinity, β2 is the lateral magnification of the second lens unit L2 when focusing on infinity, and f2 is the first magnification. This is the focal length of the second lens unit L2.

An inner focus type large aperture telephoto macro lens having a third image stabilization function according to the present invention is an inner focus type large aperture telephoto macro lens having a second image stabilization function. The fourth lens unit L4 includes an object In order from the image surface side to the image surface side, a fourth F lens L4F having a negative refractive power and a fourth R lens L4R having a positive refractive power are satisfied, and the following conditional expression (5) is satisfied.

(5) 0.003 <f4R / f4 <0.070

Here, f4R is the focal length of the fourth R lens L4R, and f4 is the focal length of the fourth lens unit L4.

In addition, an inner focus type large-aperture telephoto macro lens having a fourth image stabilization function according to the present invention has a first lens unit L1 having a positive refractive power and a negative refractive power in order from the object side to the image surface side. A second lens unit L2 having a positive refractive power, a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, and a positive refraction. consists sixth lens unit L6 and having a force, when from infinity focusing to a close object, the second said lens unit L2 at the same time moved to the image side a third lens unit L3 is an object The first lens unit L1, the fourth lens unit L4, the fifth lens unit L5, and the sixth lens unit L6 are fixed with respect to the image plane, and light is transmitted through the fifth lens unit L5. vertical image with respect to the optical axis by moving in a direction substantially perpendicular to the axis Have a stabilization function, characterized in that it is possible to move to the direction, the fourth lens unit L4 includes, in order from the object side to the image plane side, a first 4F lens L4F of negative refractive power, positive A fourth R lens L4R having a refractive power of 1 and satisfying the following conditional expression (5) .

(5) 0.003 <f4R / f4 <0.070

Here, f4R is the focal length of the fourth R lens L4R, and f4 is the focal length of the fourth lens unit L4.

Further, the inner focus type large aperture telephoto macro lens having the fifth image stabilization function of the present invention is the inner focus type large aperture telephoto macro lens having the fourth image stabilization function, which satisfies the following conditional expression (3): It is characterized by doing.

(3) 0.34 <| f2 / f | <0.97

However,
f is the focal length of the entire lens system when focusing on infinity,
f2 is a focal length of the second lens unit L2.

  An inner focus type large aperture telephoto macro lens having a sixth image stabilization function according to the present invention is the inner focus type large aperture telephoto macro lens having any one of the first to fifth image stabilization functions. The group L3 includes at least one cemented lens.

An inner focus type large aperture telephoto macro lens having a seventh image stabilization function according to the present invention is the inner focus type large aperture telephoto macro lens having any one of the first to sixth image stabilization functions. The group L3 satisfies the following conditional expression (4).

(4) 0.81 <(f3 · Fno) / f <1.90

Here, f3 is the focal length of the third lens unit L3, Fno is the F value of the entire lens system when focusing on infinity, and f is the focal length of the entire lens system when focusing on infinity.

In addition, the inner focus type large-aperture telephoto macro lens having the eighth image stabilization function of the present invention is the following conditional expression in the inner focus type large-aperture telephoto macro lens having any one of the first to seventh image stabilization functions. (6) and (7) are satisfied.

(6) 0.40 <| 1 / {β6 · (1-β5)} | <0.86
(7) 0.016 <β6 / β5 <0.052

Where β6 is the lateral magnification of the sixth lens unit L6, and β5 is the lateral magnification of the fifth lens unit L5.

An inner focus type large-aperture telephoto macro lens having a ninth image stabilization function according to the present invention is the inner focus type large-aperture telephoto macro lens having any one of the first to eighth image stabilization functions. The group L1 includes at least one positive lens and at least one negative lens, and satisfies the following conditional expression (8).

(8) θgFL1′−θgFL1 <0.050

However, θgFL1 is an average value of partial dispersion ratios θgF regarding g-line and F-line of all positive lenses included in the first lens unit L1, and θgFL1 ′ is g of all negative lenses included in the first lens unit L1. This is the average value of the partial dispersion ratio θgF for the line and the F line, and the partial dispersion ratio θgF for the g line and the F line is expressed by the following equation.

θgF = (ng−nF) / (nF−nC)

However, ng is the refractive index for g-line, nF is the refractive index for F-line, and nC is the refractive index for C-line.

  According to the present invention, it is possible to arrange a vibration isolation group at an optimal position for downsizing, to obtain a sufficient vibration isolation coefficient to obtain a necessary vibration isolation effect on the same magnification side, and to obtain good optical performance. It is possible to provide an inner focus type large-aperture telephoto macro lens having an anti-vibration function.

It is a lens block diagram of Example 1 of the present invention. FIG. 6 is a longitudinal aberration diagram at an object distance of infinity in Example 1 of the present invention. FIG. 6 is a longitudinal aberration diagram at an imaging magnification of 1: 2 in Example 1 of the present invention. FIG. 6 is a longitudinal aberration diagram at an imaging magnification of 1: 1 of Example 1 of the present invention. (A) is a lateral aberration diagram of the first embodiment of the present invention at infinite object distance, and (b) is a lateral chromatic aberration diagram of g-line and C-line with respect to d-line at infinite object distance of the first embodiment of the present invention. It is. (A) is a lateral aberration diagram at the imaging magnification 1: 2 of Example 1 of the present invention, and (b) is the magnification of the g-line and C-line with respect to the d-line at the imaging magnification 1: 2 of Example 1 of the present invention. It is a chromatic aberration diagram. (A) is a lateral aberration diagram at an imaging magnification of 1: 1 of Example 1 of the present invention, and (b) is a magnification of g-line and C-line with respect to d-line at an imaging magnification of 1: 1 of Example 1 of the present invention. It is a chromatic aberration diagram. FIG. 6 is a lateral aberration diagram at the time of 0.3 ° camera shake correction at an object distance of infinity according to Example 1 of the present invention. FIG. 6 is a lateral aberration diagram at the time of 0.3 ° camera shake correction at the photographing magnification of 1: 2 in Example 1 of the present invention. FIG. 6 is a lateral aberration diagram at the time of 0.3 ° camera shake correction at the photographing magnification of 1: 1 of Example 1 of the present invention. It is a lens block diagram of Example 2 of this invention. It is a longitudinal aberration figure in the object distance infinity of Example 2 of this invention. FIG. 6 is a longitudinal aberration diagram at an imaging magnification of 1: 2 in Example 2 of the present invention. FIG. 6 is a longitudinal aberration diagram at an imaging magnification of 1: 1 of Example 2 of the present invention. (A) is a lateral aberration diagram of the second embodiment of the present invention at infinite object distance, and (b) is a lateral chromatic aberration diagram of g-line and C-line with respect to d-line at infinite object distance of the second embodiment of the present invention. It is. (A) is a lateral aberration diagram at the imaging magnification 1: 2 of Example 2 of the present invention, and (b) is the magnification of the g-line and C-line with respect to the d-line at the imaging magnification 1: 2 of Example 2 of the present invention. It is a chromatic aberration diagram. (A) is a lateral aberration diagram at an imaging magnification of 1: 1 of Example 2 of the present invention, and (b) lateral chromatic aberration of g-line and C-line with respect to d-line at an imaging magnification of 1: 1 of Example 2 of the present invention. FIG. It is a lateral aberration figure at the time of 0.3 degree hand-shake correction | amendment in infinite object distance of Example 2 of this invention. FIG. 6 is a lateral aberration diagram at the time of 0.3 ° camera shake correction at an imaging magnification of 1: 2 in Example 2 of the present invention. FIG. 6 is a lateral aberration diagram at the time of 0.3 ° camera shake correction at an imaging magnification of 1: 1 of Example 2 of the present invention. It is a lens block diagram of Example 3 of the present invention. It is a longitudinal aberration figure in the object distance infinity of Example 3 of this invention. FIG. 6 is a longitudinal aberration diagram at an imaging magnification of 1: 2 in Example 3 of the present invention. FIG. 6 is a longitudinal aberration diagram at an imaging magnification of 1: 1 of Example 3 of the present invention. (A) is a lateral aberration diagram at infinite object distance of Example 3 of the present invention, and (b) is a lateral chromatic aberration diagram of g-line and C-line with respect to d-line at infinite object distance of Example 3 of the present invention. It is. (A) is a lateral aberration diagram at the imaging magnification 1: 2 of Example 3 of the present invention, and (b) is the magnification of the g-line and C-line with respect to the d-line at the imaging magnification 1: 2 of Example 3 of the present invention. It is a chromatic aberration diagram. (A) is a lateral aberration diagram at an imaging magnification of 1: 1 of Example 3 of the present invention, and (b) is a magnification of g-line and C-line with respect to d-line at an imaging magnification of 1: 1 of Example 3 of the present invention. It is a chromatic aberration diagram. It is a lateral aberration figure at the time of 0.3 degree hand-shake correction | amendment in the object distance infinity of Example 3 of this invention. FIG. 10 is a lateral aberration diagram at the time of 0.3 ° camera shake correction at an imaging magnification of 1: 2 in Example 3 of the present invention. FIG. 6 is a lateral aberration diagram at the time of 0.3 ° camera shake correction at an imaging magnification of 1: 1 of Example 3 of the present invention. It is a lens block diagram of Example 4 of this invention. It is a longitudinal aberration figure in the object distance infinity of Example 4 of this invention. It is a longitudinal aberration figure in imaging magnification 1: 2 of Example 4 of this invention. It is a longitudinal aberration figure in imaging magnification 1: 1 of Example 4 of this invention. (A) is a lateral aberration diagram at infinite object distance of Example 4 of the present invention, and (b) is a lateral chromatic aberration diagram of g-line and C-line with respect to d-line at infinite object distance of Example 4 of the present invention. It is. (A) is a lateral aberration diagram at the imaging magnification 1: 2 of Example 4 of the present invention, and (b) is the magnification of the g-line and C-line with respect to the d-line at the imaging magnification 1: 2 of Example 4 of the present invention. It is a chromatic aberration diagram. (A) is a lateral aberration diagram at an imaging magnification of 1: 1 of Example 4 of the present invention, and (b) is a magnification of g-line and C-line with respect to d-line at an imaging magnification of 1: 1 of Example 4 of the present invention. It is a chromatic aberration diagram. It is a lateral aberration figure at the time of 0.3 degree camera shake correction in the object distance infinity of Example 4 of this invention. It is a lateral aberration figure at the time of 0.3 degree camera shake correction | amendment in the imaging magnification 1: 2 of Example 4 of this invention. It is a lateral aberration figure at the time of 0.3 degree camera shake correction | amendment in the imaging magnification 1: 1 of Example 4 of this invention. It is a lens block diagram of Example 5 of this invention. It is a longitudinal aberration figure in the object distance infinity of Example 5 of this invention. It is a longitudinal aberration figure in imaging magnification 1: 2 of Example 5 of this invention. It is a longitudinal aberration figure in imaging magnification 1: 1 of Example 5 of this invention. (A) is a lateral aberration diagram at infinite object distance of Example 5 of the present invention, and (b) is a lateral chromatic aberration diagram of g-line and C-line with respect to d-line at infinite object distance of Example 5 of the present invention. It is. (A) is a lateral aberration diagram at the imaging magnification 1: 2 of Example 5 of the present invention, and (b) is the magnification of the g-line and C-line with respect to the d-line at the imaging magnification 1: 2 of Example 5 of the present invention. It is a chromatic aberration diagram. (A) is a lateral aberration diagram at an imaging magnification of 1: 1 of Example 5 of the present invention, and (b) is a magnification of g-line and C-line with respect to d-line at an imaging magnification of 1: 1 of Example 5 of the present invention. It is a chromatic aberration diagram. It is a lateral aberration figure at the time of 0.3 degree hand-shake correction | amendment in infinite object distance of Example 5 of this invention. It is a lateral aberration figure at the time of 0.3 degree camera shake correction | amendment in the imaging magnification 1: 2 of Example 5 of this invention. FIG. 10 is a lateral aberration diagram at the time of 0.3 ° camera shake correction in the photographing magnification 1: 1 of Example 5 of the present invention.

  Hereinafter, an inner focus type large-aperture telephoto macro lens having an anti-vibration function according to an embodiment of the present invention will be described.

  The inner focus type large-aperture telephoto macro lens having an image stabilization function according to the present embodiment includes a first lens unit L1 having a positive refractive power and a second lens having a negative refractive power in order from the object side to the image plane side. The lens unit L2, the third lens unit L3 having a positive refractive power, the fourth lens unit L4 having a positive refractive power, the fifth lens unit L5 having a negative refractive power, and a positive refractive power And a sixth lens unit L6. When focusing from an object at infinity to a short-distance object, the second lens unit L2 moves to the image plane side and simultaneously the third lens unit L3 moves to the object side. The first lens group L1, the fourth lens group L4, the fifth lens group L5, and the sixth lens group L6 are fixed with respect to the image plane, and the fifth lens group L5 is fixed with respect to the optical axis. The image can be moved by moving it in a substantially vertical direction. The features.

  The third lens unit L3 preferably includes at least one cemented lens. This makes it possible to suppress spherical aberration fluctuations during focusing from infinity to the shortest object distance.

Moreover, it is preferable that the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the present embodiment satisfies the following conditional expression.

(1) 0.38 <f1 / f <1.00
(2) 3.33 <β2 <8.79
(3) 0.34 <| f2 / f | <0.97

Where f1 is the focal length of the first lens unit L1, f is the focal length of the entire lens system when focusing on infinity, β2 is the lateral magnification of the second lens unit L2 when focusing on infinity, and f2 is the first magnification. This is the focal length of the second lens unit L2.

  Conditional expression (1) defines the focal length of the first lens unit L1 in order to achieve both miniaturization and high performance. If the upper limit of conditional expression (1) is exceeded and the focal length of the first lens unit L1 is increased, the positive refractive power becomes weak, which is particularly advantageous for correcting aberrations of spherical aberration, but the total length of the entire lens system. Not only increases, but also the diameter of the first lens unit L1 increases, which makes it difficult to reduce the size. In order to secure the effect of the present application, the upper limit value of conditional expression (1) is preferably set to 0.84.

  Further, if the lower limit of conditional expression (1) is exceeded and the focal length of the first lens unit L1 is shortened, the positive refractive power becomes strong, which is advantageous for downsizing. Negative spherical aberration increases, making it difficult to correct this. In order to secure the effect of the present application, the lower limit value of conditional expression (1) is preferably set to 0.45.

  Conditional expression (2) defines the lateral magnification of the second lens unit L2 at the time of focusing on infinity in order to achieve both miniaturization and high performance. If the upper limit of conditional expression (2) is exceeded and the lateral magnification of the second lens unit L2 increases, the amount of focus movement from the infinite object distance to the shortest becomes smaller, which is advantageous for downsizing, but the second lens Not only the spherical surface and coma aberration in the group L2 increase, but also the aberration fluctuation during focusing becomes large and it is difficult to correct this well. In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (2) to 7.33.

  When the lower limit value of conditional expression (2) is exceeded, the lateral magnification of the second lens unit L2 approaches one, so the amount of focus movement from the infinite object distance to the shortest distance increases, and the total length of the entire lens system increases. Therefore, downsizing becomes difficult. At this time, in order to secure a sufficient amount of peripheral light, it is necessary to increase the diameters of the first lens unit L1 and the second lens unit L2, and thus it is difficult to further reduce the size. In order to secure the effect of the present application, it is preferable that the lower limit value of conditional expression (2) is 4.00.

  Conditional expression (3) defines the focal length of the second lens unit L2 in order to achieve both miniaturization and high performance. If the upper limit of conditional expression (3) is exceeded and the focal length of the second lens unit L2 is increased, the amount of focus movement from the infinite object distance to the shortest distance increases, and the overall length of the entire lens system increases, making it difficult to reduce the size. It becomes. In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (3) to 0.81.

  If the lower limit of conditional expression (3) is exceeded and the focal length of the second lens unit L2 is shortened, the amount of focus movement from the infinite object distance to the shortest distance is reduced, which is advantageous for downsizing. The coma aberration fluctuation at the time becomes large, and it becomes difficult to correct this well. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (3) to 0.41.

The third lens unit L3 preferably satisfies the following conditional expression (4).

(4) 0.81 <(f3 · Fno) / f <1.90

Here, f3 is the focal length of the third lens unit L3, Fno is the F value of the entire lens system when focusing on infinity, and f is the focal length of the entire lens system when focusing on infinity.

  Conditional expression (4) defines the focal length of the third lens unit L3 and the F value of the entire lens system at the time of focusing on infinity in order to reduce performance degradation due to downsizing and manufacturing errors. When the upper limit of conditional expression (4) is exceeded and the F value of the entire lens system at the time of focusing on infinity becomes large, or the focal length of the third lens group L3 becomes long, the apparent F in the third lens group L3 Since the value increases, it is advantageous for reducing the performance deterioration when the third lens unit L3 is decentered due to a manufacturing error, but the focus movement amount of the third lens unit L3 from the infinite object distance to the shortest is increased. Since the entire length of the entire lens system increases, it is difficult to reduce the size. In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (4) to 1.58.

  If the lower limit of conditional expression (4) is exceeded and the focal length of the third lens unit L3 becomes short or the F value of the entire lens system at the time of focusing on infinity becomes small, the object distance from infinity to the shortest is reached. The amount of focus movement of the third lens unit L3 can be suppressed, which is advantageous for downsizing, but the apparent F value in the third lens unit L3 is reduced, so that the axial luminous flux in the third lens unit L3 increases. In addition to increasing the diameter of the third lens unit L3, it also increases spherical aberration, and it is difficult to correct this well. In addition, due to manufacturing errors, there is a risk that the center performance is greatly deteriorated particularly when the third lens unit L3 is decentered. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (4) to 0.97.

The fourth lens unit L4 includes, in order from the object side to the image plane side, a fourth F lens L4F having a negative refractive power and a fourth R lens L4R having a positive refractive power. The following conditional expression ( It is preferable to satisfy 5).

(5) 0.003 <f4R / f4 <0.070

Here, f4R is the focal length of the fourth R lens L4R, and f4 is the focal length of the fourth lens unit L4.

  Conditional expression (5) defines the focal length of the fourth R lens component L4R in order to achieve both miniaturization and high performance. When the upper limit of conditional expression (5) is exceeded and the focal length of the fourth R lens component is increased, the positive refractive power of the fourth lens unit L4 becomes weaker, so that the peripheral field angle emitted from the fourth lens unit L4 is reduced. Since the emission angle of the upper light beam with respect to the optical axis is increased and the height of the incident light beam to the fifth lens unit L5 is increased, the diameter of the fifth lens unit L5 is increased and the diameter of the image stabilizing unit is increased. Become. In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (5) to 0.058.

  If the lower limit of conditional expression (5) is exceeded and the focal length of the fourth R lens component L4R becomes shorter, the positive refractive power of the fourth lens unit L4 becomes stronger, so the diameter of the fifth lens unit L5 is reduced. In particular, negative spherical aberration and astigmatism at the time of focusing at infinity are increased, and it is difficult to correct them satisfactorily. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (5) to 0.004.

Moreover, it is preferable that the following conditional expressions (6) and (7) are satisfied.

(6) 0.40 <| 1 / {β6 · (1-β5)} | <0.86
(7) 0.016 <β6 / β5 <0.052

Where β6 is the lateral magnification of the sixth lens unit L6, and β5 is the lateral magnification of the fifth lens unit L5.

  Conditional expression (6) defines an anti-vibration coefficient of the anti-vibration group in order to determine an optimal movement amount of the anti-vibration group.

The image stabilization coefficient kos is a ratio of the image blur correction amount Δy on the image plane to the movement amount Δx of the image stabilization group, and can be expressed by the following equation (a).

(A) kos = Δy / Δx = βB · (1-βos)

Here, kos is the image stabilization coefficient, Δx is the movement amount of the image stabilization group, Δy is the image blur correction amount on the image plane, βos is the lateral magnification of the image stabilization group,
βB is the lateral magnification of the group after the vibration isolation group.

  If the upper limit of conditional expression (6) is exceeded and the image stabilization coefficient becomes smaller, the refractive power of the image stabilization group becomes weaker, which is advantageous for aberration correction. However, the amount of movement required during image stabilization increases, and image stabilization occurs. Since the unit diameter increases, miniaturization becomes difficult. In order to secure the effect of the present application, it is preferable to set the upper limit of conditional expression (6) to 0.71.

  Also, if the lower limit of conditional expression (6) is exceeded and the image stabilization coefficient increases, the amount of movement required during image stabilization can be reduced, but the refractive power of the image stabilization group becomes stronger, so the astigmatism during non-image stabilization is reduced. Aberrations, coma aberrations, eccentric coma during vibration isolation, and lateral chromatic aberration fluctuations increase, making it difficult to correct them well. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (6) to 0.42.

  Conditional expression (7) defines the lateral magnification of the fifth lens unit L5 and the sixth lens unit L6 for higher performance. If the upper limit value of the conditional expression (7) is exceeded while securing the image stabilization coefficient defined by the conditional expression (6), the lateral magnification of the sixth lens group L6 increases, and the fifth lens group L5 is decentered due to manufacturing errors. Astigmatism fluctuations at this time are magnified by the sixth lens unit L6, and in particular, the performance of the peripheral field angle of the entire lens system may be greatly deteriorated. In order to secure the effect of the present application, the upper limit value of conditional expression (7) is preferably 0.044.

  If the lower limit of conditional expression (7) is exceeded while securing the image stabilization coefficient defined by conditional expression (6), the lateral magnification of the sixth lens unit L6 becomes small, and the performance of the peripheral angle of view deteriorates due to manufacturing errors. However, the lateral magnification of the fifth lens unit L5 increases, and decentration coma aberration and lateral chromatic aberration fluctuation during image stabilization increase, making it difficult to correct them satisfactorily. In order to secure the effect of the present application, it is preferable to set the lower limit of conditional expression (7) to 0.019.

In the inner focus type large-aperture telephoto macro lens having an image stabilization function according to the present embodiment, the first lens unit L1 includes at least one positive lens and at least one negative lens. Is preferably satisfied.

(8) θgFL1′−θgFL1 <0.050

However, θgFL1 is an average value of partial dispersion ratios θgF regarding g-line and F-line of all positive lenses included in the first lens unit L1, and θgFL1 ′ is g of all negative lenses included in the first lens unit L1. This is the average value of the partial dispersion ratio θgF for the line and the F line, and the partial dispersion ratio θgF for the g line and the F line is expressed by the following equation (b).

(B) θgF = (ng−nF) / (nF−nC)

However, ng is the refractive index for g-line, nF is the refractive index for F-line, and nC is the refractive index for C-line.

  In order to achieve high performance in the conditional expression (8), the average value of partial dispersion ratios regarding the g-line and F-line of the positive lens included in the first lens unit L1 and the negative value included in the first lens unit L1. It defines the difference between the average values of the partial dispersion ratios regarding the g-line and the F-line of the lens. If the upper limit value of conditional expression (8) is exceeded, not only the secondary spectrum correction at infinity focusing will be insufficient, but also the lateral chromatic aberration correction at the shortest shooting time will be insufficient, and these will be corrected well by the entire lens system. Difficult to do. In order to secure the effect of the present application, the upper limit value of conditional expression (8) is preferably 0.042.

  In order to suppress the outer diameter of the product while securing a desired F value at infinity focusing, it is preferable that the aperture stop S is disposed between the third lens group L3 and the fourth lens group L4. The aperture stop S is preferably variable so that the aperture stop diameter becomes small when focusing from infinity to the shortest object distance, so that a favorable aberration correction can be maintained when focusing from infinity to the shortest object distance. It is possible to set to the F value.

  The first lens unit L1 includes a plurality of single-convex lenses including at least one convex lens having an Abbe number of 80 or more in order from the object side to the image plane side, and a biconvex lens in order from the object side to the image plane side. And a biconcave lens, it is possible to satisfactorily correct axial chromatic aberration especially at the time of focusing on infinity, and to mitigate the performance deterioration of the first lens unit L1 due to manufacturing errors. Become.

  The third lens unit L3 is composed of a convex meniscus lens having a convex surface facing the object side, a concave meniscus lens having a convex surface facing the object side, and a biconvex lens in order from the object side to the image surface side. As a result, it is possible to alleviate performance degradation when the third lens unit L3 is decentered due to manufacturing errors.

  Hereinafter, an inner focus type large-aperture telephoto macro lens having an image stabilization function according to a numerical example will be described with reference to the drawings.

  FIG. 1 is a lens configuration diagram of an inner focus type large-aperture telephoto macro lens having an anti-vibration function according to Example 1 when focusing on infinity.

  The inner focus type large-aperture telephoto macro lens of FIG. 1 includes, in order from the object side to the image plane side, a first lens unit L1 having a positive refractive power that is fixed with respect to the image plane at the time of focusing from infinity to the shortest object distance; A second lens unit L2 having a negative refractive power that moves toward the image surface during focusing, a third lens unit L3 having a positive refractive power that moves toward the object side during focusing, and an aperture that is fixed with respect to the image surface during focusing. The aperture stop S includes a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power.

  During focusing from infinity to the shortest object distance, the second lens unit L2 moves from the object side to the image plane side as indicated by the arrow, and the third lens unit L3 moves from the image plane side to the object side, thereby focusing. The image plane fluctuation is corrected well.

  The first lens unit L1 includes, in order from the object side to the image surface side, a biconvex lens, a biconvex lens, a convex meniscus lens having a convex surface facing the object side, and a cemented lens of a biconvex lens and a biconcave lens. The second lens unit L2 includes, in order from the object side to the image surface side, a concave meniscus lens having a convex surface directed toward the object side, and a cemented lens of a plano-convex lens having a flat surface directed toward the object side and a biconcave lens. The third lens unit L3 includes, in order from the object side to the image plane side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens. The fourth lens unit L4 includes a biconcave lens and a biconvex lens in order from the object side to the image plane side. The fifth lens unit L5 includes, in order from the object side to the image plane side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, a convex meniscus lens having a convex surface facing the object side, and a biconcave lens. The sixth lens unit L6 includes, in order from the object side to the image surface side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens.

  The specification values of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 1 are shown below. In (overall specifications), f represents a focal length, Fno represents an F number, and 2ω represents an angle of view (unit: °). In (lens specifications), the first column is the order of the lens surfaces counted from the object side, the second column R is the radius of curvature of the lens surfaces, the third column D is the lens surface interval, and the fourth column nd is the d line (wavelength). The refractive index at λ = 587.6 nm), the fifth column νd represents the Abbe number at the d-line (wavelength λ = 587.6 nm). R = 0.0000 represents a plane, Bf represents a back focus, the diaphragm represents a diaphragm surface, and the refractive index n = 1.0000 of air is omitted. (Variable interval) indicates a photographing magnification and a variable interval. In the (glass material refractive index table), the first column is the lens number counted in order from the object side to the image plane side, the second column nC is the refractive index at the C line (wavelength λ = 656.3 nm), and the third column nF is The refractive index at F line (wavelength λ = 486.1 nm), the fourth column ng is the refractive index at g line (wavelength λ = 435.8 nm), and the fifth column θgF is the partial dispersion ratio for g line and F line. Show.

  In all the following values, the described focal length f, radius of curvature R, lens surface distance D, and other lengths are “mm” unless otherwise specified. Even in proportional reduction, the same optical performance can be obtained, and the present invention is not limited to this. Since these symbols are the same in the following embodiments, the description after the second embodiment will be omitted.

  The specification values of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 1 are shown below.

Numerical example 1
(Lens origin)
RD nd vd
[1] 499.4272 4.7709 1.51680 64.20
[2] -499.4272 0.2500
[3] 204.2556 5.9603 1.43700 95.10
[4] -1000.0000 0.2500
[5] 125.4643 5.7322 1.43700 95.10
[6] 543.5587 0.2500
[7] 99.9492 9.8174 1.59349 67.00
[8] -183.3644 2.5000 1.80610 40.73
[9] 283.2889 d9
[10] 1000.0000 2.5000 1.77250 49.62
[11] 101.3017 3.8000
[12] 0.0000 4.3200 1.80518 25.46
[13] -131.8207 2.0000 1.51823 58.96
[14] 97.7767 d14
[15] 55.9854 4.7160 1.72916 54.67
[16] 1000.0000 0.1500
[17] 61.6150 1.3000 1.80610 33.27
[18] 28.9369 8.2943 1.43700 95.10
[19] -902.7037 d19
[20] Aperture 4.6731
[21] -98.6986 1.6298 1.84666 23.78
[22] 47.9525 4.3719
[23] 61.9220 5.9922 1.84666 23.78
[24] -81.4001 3.3330
[25] 82.2704 0.9000 1.62041 60.34
[26] 19.7785 3.2167 1.80518 25.46
[27] 27.2441 4.6189
[28] -76.7767 0.9000 1.62041 60.34
[29] 59.0591 2.8946
[30] 67.8594 2.9883 1.62041 60.34
[31] 241.3292 0.1500
[32] 59.7660 2.5000 1.84666 23.78
[33] 26.5740 9.5000 1.80610 40.73
[34] -554.6594 Bf

(General specifications)
Magnification INF 1: 2 1: 1
f 174.60 133.36 101.19
Fno 2.91 4.72 5.32
2ω 14.07 5.23 1.98

(Variable interval)
Magnification INF 1: 2 1: 1
d9 5.0528 20.0456 36.6935
d14 70.7920 38.0818 6.0597
d19 4.0522 21.7696 37.1438
Bf 52.97 52.97 52.97

(Glass refractive index table)
Lens nC nF ng θgF
1 1.51432 1.52237 1.52667 0.534
2 1.43559 1.44019 1.44264 0.533
3 1.43559 1.44019 1.44264 0.533
4 1.59078 1.59964 1.60439 0.536
5 1.80022 1.82001 1.83123 0.567

  FIG. 2 shows longitudinal aberrations at the time of focusing on infinity of the inner focus type large aperture telephoto macro lens having the image stabilization function according to the first embodiment. FIG. 3 shows longitudinal aberrations at an imaging magnification of 1: 2 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the first embodiment. FIG. 4 shows longitudinal aberrations at an imaging magnification of 1: 1 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the first embodiment. In FIG. 5, the normal lateral aberration of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the first embodiment at the time of focusing on infinity is (a), and the magnification of the g-line and C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 6, the normal lateral aberration of the imaging magnification 1: 2 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 1 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 7, the lateral aberration at the normal time of the photographing magnification 1: 1 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 1 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. FIG. 8 shows lateral aberrations of the inner focus large aperture telephoto macro lens having the image stabilization function according to Example 1 when correcting camera shake corresponding to an incident angle of 0.3 ° when focusing on infinity. FIG. 9 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 2 of the inner focus type large aperture telephoto macro lens having the image stabilization function according to the first embodiment. FIG. 10 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 1 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the first example.

  In each aberration diagram, Fno is the F number, C is the C line (wavelength λ = 656.3 nm), d is the d line (wavelength λ = 587.6 nm), g is the g line (wavelength λ = 435.8 nm), ΔM Denotes a d-line meridional image plane, and ΔS denotes a d-line sagittal image plane. Since these symbols are the same in the following embodiments, description thereof will be omitted.

  FIG. 11 is a lens configuration diagram of an inner focus type large aperture telephoto macro lens having an image stabilization function according to Example 2 when focusing on infinity.

  The inner focus type large-aperture telephoto macro lens in FIG. 11 includes, in order from the object side to the image plane side, a first lens unit L1 having a positive refractive power that is fixed with respect to the image plane at the time of focusing from the infinite object distance to the shortest distance; A second lens unit L2 having a negative refractive power that moves toward the image surface during focusing, a third lens unit L3 having a positive refractive power that moves toward the object side during focusing, and an aperture that is fixed with respect to the image surface during focusing. The aperture stop S includes a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power.

  When focusing from infinity to the shortest object distance, the second lens unit L2 moves from the object side to the image plane side as indicated by the arrow, and the third lens unit L3 moves from the image plane side to the object side. The image plane fluctuation at the time of focus is corrected well.

  The first lens unit L1 includes, in order from the object side to the image surface side, a biconvex lens, a biconvex lens, a convex meniscus lens having a convex surface facing the object side, and a cemented lens of a biconvex lens and a biconcave lens. The second lens unit L2 includes, in order from the object side to the image surface side, a concave meniscus lens having a convex surface directed toward the object side, and a cemented lens of a plano-convex lens having a flat surface directed toward the object side and a biconcave lens. The third lens unit L3 includes, in order from the object side to the image plane side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens. The fourth lens unit L4 includes a biconcave lens and a biconvex lens in order from the object side to the image plane side. The fifth lens unit L5 includes, in order from the object side to the image plane side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, a convex meniscus lens having a convex surface facing the object side, and a biconcave lens. The sixth lens unit L6 includes, in order from the object side to the image surface side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens.

  The specification values of the inner focus type large aperture telephoto macro lens according to Example 2 are shown below.

Numerical example 2
(Lens origin)
RD nd vd
[1] 502.7544 4.9645 1.51680 64.20
[2] -502.7544 0.2500
[3] 227.4305 5.9179 1.43700 95.10
[4] -1000.0000 0.2500
[5] 132.3846 5.9221 1.43700 95.10
[6] 634.3574 0.2500
[7] 100.0713 10.3585 1.59349 67.00
[8] -186.4796 2.5000 1.80610 40.73
[9] 269.9115 d9
[10] 789.5498 2.5000 1.77250 49.62
[11] 105.7920 3.8000
[12] 0.0000 4.4176 1.80518 25.46
[13] -138.2928 2.0000 1.51823 58.96
[14] 98.1202 d14
[15] 57.5218 4.6931 1.72916 54.67
[16] 996.1094 0.1500
[17] 61.0475 1.3000 1.80610 33.27
[18] 29.5595 8.3023 1.43700 95.10
[19] -1000.0000 d19
[20] Aperture 2.7464
[21] -116.8912 2.1207 1.80518 25.46
[22] 50.7383 4.1973
[23] 65.0249 5.6223 1.80518 25.46
[24] -95.7593 3.5133
[25] 93.4176 0.9000 1.62041 60.34
[26] 19.8131 3.1430 1.80518 25.46
[27] 27.8919 4.3024
[28] -73.9049 0.9000 1.58913 61.25
[29] 56.8499 2.9237
[30] 67.7077 2.7826 1.62041 60.34
[31] 308.2191 1.2017
[32] 62.8338 1.3000 1.84666 23.78
[33] 28.6712 9.5000 1.80610 40.73
[34] -434.5575 Bf

(General specifications)
Magnification INF 1: 2 1: 1
f 174.60 135.59 103.47
Fno 2.92 4.62 5.34
2ω 14.07 4.90 2.70

(Variable interval)
Magnification INF 1: 2 1: 1
d9 4.9234 20.5289 37.6004
d14 73.9422 39.9411 6.3155
d19 5.8630 24.2585 40.8127
Bf 53.29 53.29 53.29

(Glass refractive index table)
Lens nC nF ng θgF
1 1.51432 1.52237 1.52667 0.534
2 1.43559 1.44019 1.44264 0.533
3 1.43559 1.44019 1.44264 0.533
4 1.59078 1.59964 1.60439 0.536
5 1.80022 1.82001 1.83123 0.567

  FIG. 12 shows longitudinal aberrations at the time of focusing on infinity of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the second embodiment. FIG. 13 shows longitudinal aberrations at an imaging magnification of 1: 2 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the second embodiment. FIG. 14 shows longitudinal aberrations at an imaging magnification of 1: 1 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to the second embodiment. In FIG. 15, the normal lateral aberration of the inner focus type large aperture telephoto macro lens having the image stabilization function according to the second embodiment at the time of focusing on infinity is (a), and the magnification of the g line and the C line with respect to the d line. A chromatic aberration diagram is shown in FIG. In FIG. 16, the normal lateral aberration of the imaging magnification 1: 2 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 2 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 17, the lateral aberration at the normal time of the photographing magnification of 1: 1 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 2 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. FIG. 18 shows lateral aberrations of the inner focus large-aperture telephoto macro lens having the image stabilization function according to Example 2 when correcting camera shake corresponding to an incident angle of 0.3 ° when focusing at infinity. FIG. 19 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 2 of the inner focus type large-aperture telephoto macro lens having an image stabilization function according to Example 2. FIG. 20 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 1 of the inner focus large-aperture telephoto macro lens having an image stabilization function according to Example 2.

  FIG. 21 is a lens configuration diagram of an inner focus type large aperture telephoto macro lens having an image stabilization function according to Example 3 when focusing on infinity. The inner focus type large-aperture telephoto macro lens in FIG. 21 includes, in order from the object side to the image plane side, a first lens unit L1 having a positive refractive power that is fixed with respect to the image plane at the time of focusing from the infinite object distance to the shortest distance; A second lens unit L2 having a negative refractive power that moves toward the image surface during focusing, a third lens unit L3 having a positive refractive power that moves toward the object side during focusing, and an aperture that is fixed with respect to the image surface during focusing. The aperture stop S includes a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power.

  When focusing from infinity to the shortest object distance, the second lens unit L2 moves from the object side to the image plane side as indicated by the arrow, and the third lens unit L3 moves from the image plane side to the object side. The image plane fluctuation at the time of focus is corrected well.

  The first lens unit L1 includes, in order from the object side to the image surface side, a biconvex lens, a biconvex lens, a convex meniscus lens having a convex surface facing the object side, and a cemented lens of a biconvex lens and a biconcave lens. The second lens unit L2 includes, in order from the object side to the image surface side, a concave meniscus lens having a convex surface directed toward the object side, and a cemented lens of a plano-convex lens having a flat surface directed toward the object side and a biconcave lens. The third lens unit L3 includes, in order from the object side to the image plane side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens. The fourth lens unit L4 includes a biconcave lens and a biconvex lens in order from the object side to the image plane side. The fifth lens unit L5 includes, in order from the object side to the image plane side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, a convex meniscus lens having a convex surface facing the object side, and a biconcave lens. The sixth lens unit L6 includes, in order from the object side to the image surface side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens.

  In the following, specification values of the inner focus type large aperture telephoto macro lens according to Example 3 are shown.

Numerical Example 3
(Lens origin)
RD nd vd
[1] 492.8167 4.6242 1.48749 70.45
[2] -506.3088 0.2500
[3] 206.2789 5.7646 1.43700 95.10
[4] -1000.0000 0.2500
[5] 127.1662 5.7084 1.43700 95.10
[6] 639.8833 0.2500
[7] 92.0853 10.0948 1.59349 67.00
[8] -183.0723 2.5000 1.80610 40.73
[9] 307.4926 d9
[10] 1000.0000 2.5000 1.77250 49.62
[11] 94.4688 3.8000
[12] 0.0000 4.4413 1.80518 25.46
[13] -123.6119 2.0000 1.51823 58.96
[14] 88.4352 d14
[15] 54.4297 4.7996 1.72916 54.67
[16] 863.8238 0.1500
[17] 62.9746 1.3000 1.80610 33.27
[18] 28.7987 8.3094 1.43700 95.10
[19] -962.8406 d19
[20] Aperture 4.5465
[21] -113.5030 1.7220 1.84666 23.78
[22] 50.4836 4.5559
[23] 67.5265 5.7372 1.84666 23.78
[24] -89.6814 3.4383
[25] 82.2264 0.9000 1.62041 60.34
[26] 19.7133 3.2157 1.80518 25.46
[27] 27.1831 4.6058
[28] -77.3095 0.9000 1.59349 67.00
[29] 59.4689 2.8719
[30] 66.3235 3.8000 1.59349 67.00
[31] 236.4941 0.1500
[32] 59.0593 2.4997 1.84666 23.78
[33] 27.1686 9.5000 1.80610 40.73
[34] -784.0271 Bf

(General specifications)
Magnification INF 1: 2 1: 1
f 174.60 132.20 100.27
Fno 2.91 4.74 5.31
2ω 14.07 5.41 1.77

(Variable interval)
Magnification INF 1: 2 1: 1
d9 5.0578 17.6750 31.0877
d14 66.2667 35.6295 6.3277
d19 4.0616 22.0816 37.9707
Bf 52.18 52.18 52.18

(Glass refractive index table)
Lens nC nF ng θgF
1 1.48535 1.49227 1.49594 0.530
2 1.43559 1.44019 1.44264 0.533
3 1.43559 1.44019 1.44264 0.533
4 1.59078 1.59964 1.60439 0.536
5 1.80022 1.82001 1.83123 0.567

  FIG. 22 shows longitudinal aberrations of the inner focus large aperture telephoto macro lens having the image stabilization function according to Example 3 when focusing on infinity. FIG. 23 shows longitudinal aberrations at an imaging magnification of 1: 2 of the inner focus large-aperture telephoto macro lens having an image stabilization function according to Example 3. FIG. 24 shows longitudinal aberrations at an imaging magnification of 1: 1 of the inner focus large-aperture telephoto macro lens having the image stabilization function according to the third embodiment. In FIG. 25, the normal lateral aberration of the inner focus type large-aperture telephoto macro lens having an image stabilization function according to Example 3 at the time of focusing on infinity is (a), and the magnification of the g-line and C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 26, the normal lateral aberration of the imaging magnification 1: 2 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 3 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 27, the lateral aberration at the normal time of the photographing magnification 1: 1 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 3 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. FIG. 28 shows lateral aberrations in the case of camera shake correction corresponding to an incident angle of 0.3 ° when the inner focus type large aperture telephoto macro lens having the image stabilization function according to Example 3 is focused at infinity. FIG. 29 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 2 of the inner focus type large-aperture telephoto macro lens having an image stabilization function according to Example 3. FIG. 30 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 1 of the inner focus type large-aperture telephoto macro lens having an image stabilization function according to Example 3.

  FIG. 31 is a lens configuration diagram of an inner focus type large aperture telephoto macro lens having an image stabilization function according to Example 4 when focusing on infinity.

  The inner focus type large-aperture telephoto macro lens in FIG. 31 includes, in order from the object side to the image plane side, a first lens unit L1 having a positive refractive power fixed to the image plane at the time of focusing from the infinite object distance to the shortest distance; A second lens unit L2 having a negative refractive power that moves toward the image surface during focusing, a third lens unit L3 having a positive refractive power that moves toward the object side during focusing, and an aperture that is fixed with respect to the image surface during focusing. The aperture stop S includes a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power.

  When focusing from infinity to the shortest object distance, the second lens unit L2 moves from the object side to the image plane side as indicated by the arrow, and the third lens unit L3 moves from the image plane side to the object side. The image plane fluctuation at the time of focus is corrected well.

  The first lens unit L1 includes, in order from the object side to the image surface side, a biconvex lens, a biconvex lens, a convex meniscus lens having a convex surface facing the object side, and a cemented lens of a biconvex lens and a biconcave lens. The second lens unit L2 includes, in order from the object side to the image surface side, a concave meniscus lens having a convex surface directed toward the object side, and a cemented lens of a plano-convex lens having a flat surface directed toward the object side and a biconcave lens. The third lens unit L3 includes, in order from the object side to the image plane side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens. The fourth lens unit L4 includes a biconcave lens and a biconvex lens in order from the object side to the image plane side. The fifth lens unit L5 includes, in order from the object side to the image plane side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, a convex meniscus lens having a convex surface facing the object side, and a biconcave lens. The sixth lens unit L6 includes, in order from the object side to the image surface side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens.

  The specification values of the inner focus type large-aperture telephoto macro lens according to Example 4 are shown below.

Numerical Example 4
(Lens origin)
RD nd vd
[1] 501.8254 4.8237 1.51680 64.20
[2] -501.8254 0.2500
[3] 228.6284 5.7210 1.43700 95.10
[4] -1000.0000 0.2500
[5] 134.4117 5.7416 1.43700 95.10
[6] 680.6884 0.2500
[7] 106.9729 9.7769 1.59349 67.00
[8] -183.8450 2.5000 1.80610 40.73
[9] 259.8097 d9
[10] 848.6872 2.5000 1.77250 49.62
[11] 118.6206 3.8000
[12] 0.0000 4.3931 1.80518 25.46
[13] -141.8028 2.0000 1.51823 58.96
[14] 101.2027 d14
[15] 58.8329 4.6169 1.72916 54.67
[16] 1000.0000 0.1500
[17] 58.7628 1.3000 1.80610 33.27
[18] 29.5443 8.3144 1.43700 95.10
[19] -1000.0000 d19
[20] Aperture 4.5131
[21] -120.7949 1.6038 1.80518 25.46
[22] 51.5727 4.8161
[23] 67.8080 5.5094 1.80518 25.46
[24] -99.5849 3.5576
[25] 89.2229 0.9000 1.62041 60.34
[26] 19.4303 3.1904 1.80518 25.46
[27] 27.5604 4.3605
[28] -71.8493 0.9000 1.58913 61.25
[29] 55.2687 2.9354
[30] 66.5878 3.8000 1.62041 60.34
[31] 229.1403 0.3523
[32] 62.2968 2.0000 1.84666 23.78
[33] 27.5289 9.5000 1.80610 40.73
[34] -308.2575 Bf

(General specifications)
Magnification INF 1: 2 1: 1
f 174.60 136.53 104.18
Fno 2.89 4.73 5.33
2ω 14.07 5.09 2.19

(Variable interval)
Magnification INF 1: 2 1: 1
d9 4.9566 23.0854 43.5339
d14 78.8484 42.8399 6.2618
d19 4.0630 21.9427 38.0723
Bf 52.74 52.74 52.74

(Glass refractive index table)
Lens nC nF ng θgF
1 1.51432 1.52237 1.52667 0.534
2 1.43559 1.44019 1.44264 0.533
3 1.43559 1.44019 1.44264 0.533
4 1.59078 1.59964 1.60439 0.536
5 1.80022 1.82001 1.83123 0.567

  FIG. 32 shows longitudinal aberrations at the time of focusing on infinity of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 4. FIG. 33 shows longitudinal aberrations at an imaging magnification of 1: 2 of the inner focus large-aperture telephoto macro lens having an image stabilization function according to Example 4. FIG. 34 shows longitudinal aberrations at an imaging magnification of 1: 1 of the inner focus large-aperture telephoto macro lens having the image stabilization function according to Example 4. In FIG. 35, the normal lateral aberration of the inner focus type large-aperture telephoto macro lens having an image stabilization function according to Example 4 at the time of focusing on infinity is shown in (a), and the magnification of the g-line and C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 36, the normal lateral aberration of the imaging magnification 1: 2 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 4 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 37, the lateral aberration at the normal time of the photographing magnification 1: 1 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 4 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. FIG. 38 shows lateral aberrations of the inner focus type large aperture telephoto macro lens having the image stabilization function according to Example 4 when correcting the camera shake corresponding to an incident angle of 0.3 ° when focusing on infinity. FIG. 39 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 2 of the inner-focus large-aperture telephoto macro lens having an image stabilization function according to Example 4. FIG. 40 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 1 of the inner focus large-aperture telephoto macro lens having an image stabilization function according to Example 4.

  FIG. 41 is a lens configuration diagram of the inner focus large-aperture telephoto macro lens having the image stabilization function according to Example 5 when focusing on infinity.

  The inner focus type large-aperture telephoto macrolens in FIG. 41 includes, in order from the object side to the image plane side, a first lens unit L1 having a positive refractive power that is fixed with respect to the image plane at the time of focusing from infinity to the shortest object distance; A second lens unit L2 having a negative refractive power that moves toward the image surface during focusing, a third lens unit L3 having a positive refractive power that moves toward the object side during focusing, and an aperture that is fixed with respect to the image surface during focusing. The aperture stop S includes a fourth lens unit L4 having a positive refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power.

  When focusing from infinity to the shortest object distance, the second lens unit L2 moves from the object side to the image plane side as indicated by the arrow, and the third lens unit L3 moves from the image plane side to the object side. The image plane fluctuation at the time of focus is corrected well.

  The first lens unit L1 includes, in order from the object side to the image surface side, a biconvex lens, a biconvex lens, a convex meniscus lens having a convex surface facing the object side, and a cemented lens of a biconvex lens and a biconcave lens. The second lens unit L2 includes, in order from the object side to the image surface side, a concave meniscus lens having a convex surface directed toward the object side, and a cemented lens of a plano-convex lens having a flat surface directed toward the object side and a biconcave lens. The third lens unit L3 includes, in order from the object side to the image plane side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens. The fourth lens unit L4 includes a biconcave lens and a biconvex lens in order from the object side to the image plane side. The fifth lens unit L5 includes, in order from the object side to the image plane side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, a convex meniscus lens having a convex surface facing the object side, and a biconcave lens. The sixth lens unit L6 includes, in order from the object side to the image surface side, a convex meniscus lens having a convex surface facing the object side, a cemented lens of a concave meniscus lens having a convex surface facing the object side, and a biconvex lens.

  The specification values of the inner focus type large-aperture telephoto macro lens according to Example 5 are shown below.

Numerical Example 5
(Lens origin)
RD nd vd
[1] 497.9679 4.7491 1.51680 64.20
[2] -497.9679 0.2500
[3] 223.1134 5.6678 1.43700 95.10
[4] -1000.0000 0.2500
[5] 130.8862 5.6739 1.43700 95.10
[6] 634.8587 0.2500
[7] 102.7184 9.7593 1.59349 67.00
[8] -181.3097 2.5000 1.80610 40.73
[9] 260.5743 d9
[10] 940.6304 2.5000 1.77250 49.62
[11] 109.0209 3.8000
[12] 0.0000 4.4387 1.80518 25.46
[13] -133.6726 2.0000 1.51823 58.96
[14] 102.8251 d14
[15] 57.0430 4.6014 1.72916 54.67
[16] 610.2521 0.1500
[17] 58.6170 1.3000 1.80610 33.27
[18] 29.0972 8.5990 1.43700 95.10
[19] -426.0296 d19
[20] Aperture 4.5224
[21] -118.9693 1.3000 1.80518 25.46
[22] 46.5038 4.8549
[23] 57.4072 5.8058 1.80518 25.46
[24] -97.9626 3.5169
[25] 111.6508 0.9000 1.62041 60.34
[26] 19.9357 3.1476 1.80518 25.46
[27] 28.0652 4.2929
[28] -72.5767 0.9000 1.58913 61.25
[29] 55.8282 2.9955
[30] 69.6865 3.8000 1.62041 60.34
[31] 289.7155 0.4865
[32] 63.4341 1.7639 1.84666 23.78
[33] 27.7906 9.5000 1.80610 40.73
[34] -325.5525 Bf

(General specifications)
Magnification INF 1: 2 1: 1
f 174.60 135.06 103.04
Fno 2.91 4.73 5.33
2ω 14.07 5.36 1.72

(Variable interval)
Magnification INF 1: 2 1: 1
d9 5.0151 21.7678 40.7961
d14 74.0922 40.3567 6.1746
d19 3.8779 20.8607 36.0145
Bf 53.49 53.49 53.49

(Glass refractive index table)
Lens nC nF ng θgF
1 1.51432 1.52237 1.52667 0.534
2 1.43559 1.44019 1.44264 0.533
3 1.43559 1.44019 1.44264 0.533
4 1.59078 1.59964 1.60439 0.536
5 1.80022 1.82001 1.83123 0.567

  FIG. 42 shows longitudinal aberrations at the time of focusing on infinity of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 5. FIG. 43 shows longitudinal aberrations at an imaging magnification of 1: 2 of the inner focus type large-aperture telephoto macro lens having an image stabilization function according to Example 5. FIG. 44 shows longitudinal aberrations of the imaging magnification 1: 1 of the inner focus large-aperture telephoto macro lens having the image stabilization function according to the fifth embodiment. In FIG. 45, (a) is the normal lateral aberration of the inner focus large-aperture telephoto macro lens having the image stabilization function according to Example 5 when focusing on infinity, and the magnification of the g-line and C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 46, the normal lateral aberration of the imaging magnification 1: 2 of the inner focus type large-aperture telephoto macro lens having the image stabilization function according to Example 5 is (a), and the magnification of the g-line and the C-line with respect to the d-line. A chromatic aberration diagram is shown in FIG. In FIG. 47, the normal lateral aberration at an imaging magnification of 1: 1 of the inner focus type large aperture telephoto macro lens having the image stabilization function according to Example 5 is (a), and the magnification of the g line and the C line with respect to the d line. A chromatic aberration diagram is shown in FIG. FIG. 48 shows lateral aberrations in the case of camera shake correction corresponding to an incident angle of 0.3 ° when the inner focus type large aperture telephoto macro lens having an image stabilization function according to Example 5 is focused at infinity. FIG. 49 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 2 of the inner focus large-aperture telephoto macro lens having an image stabilization function according to Example 5. FIG. 50 shows lateral aberrations at the time of camera shake correction corresponding to an incident angle of 0.3 ° at an imaging magnification of 1: 1 of the inner focus large-aperture telephoto macro lens having an image stabilization function according to Example 5.

  In addition, a list of corresponding values of the conditional expressions in each of these examples is shown.

(Values for conditional expressions)
Condition range Example 1 Example 2 Example 3 Example 4 Example 5
(1) 0.38 <f1 / f <1.00 0.61 0.63 0.57 0.67 0.65
(2) 3.33 <β2 <8.79 5.41 5.40 5.86 5.00 5.21
(3) 0.34 <| f2 / f | <0.97 0.57 0.59 0.51 0.65 0.62
(4) 0.81 <(f3 ・ Fno) / f <1.90 1.25 1.26 1.26 1.23 1.21
(5) 0.003 <f4R / f4 <0.070 0.044 0.015 0.024 0.005 0.047
(6) 0.40 <| 1 / {β6 ・ (1-β5)} | <0.86 0.55 0.55 0.57 0.55 0.53
(7) 0.016 <β6 / β5 <0.052 0.031 0.035 0.024 0.036 0.035
(8) θgFL1'-θgFL1 <0.050 0.033 0.033 0.034 0.033 0.033

L1 First lens unit L1
L2 Second lens unit L2
L3 Third lens unit L3
L4 Fourth lens unit L4
L5 5th lens unit L5
L6 6th lens group L6
L4F 4F lens group L4R 4R lens group S Aperture stop I Image plane d d-line C C-line g g-line Fno F-number ΔS sagittal image plane ΔM meridional image plane

Claims (9)

In order from the object side to the image plane side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a positive The fourth lens unit L4 having a refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power, are arranged to convert an object from infinity to a close object. At the time of focusing, the second lens unit L2 moves to the image plane side and at the same time, the third lens unit L3 moves to the object side, and the first lens unit L1, the fourth lens unit L4, and the fifth lens. The group L5 and the sixth lens group L6 are fixed with respect to the image plane, and the image is moved in the direction perpendicular to the optical axis by moving the fifth lens group L5 in a direction substantially perpendicular to the optical axis. have a stabilization function, characterized in that it is possible to, the following conditional expression (3) Internal focusing large-aperture telephoto macro lens, characterized in that the foot.

(3) 0.34 <| f2 / f | <0.97

However,
f is the focal length of the entire lens system when focusing on infinity,
f2 is a focal length of the second lens unit L2.
In order from the object side to the image plane side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a positive The fourth lens unit L4 having a refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power, are arranged to convert an object from infinity to a close object. At the time of focusing, the second lens unit L2 moves to the image plane side and at the same time, the third lens unit L3 moves to the object side, and the first lens unit L1, the fourth lens unit L4, and the fifth lens. The group L5 and the sixth lens group L6 are fixed with respect to the image plane, and the image is moved in the direction perpendicular to the optical axis by moving the fifth lens group L5 in a direction substantially perpendicular to the optical axis. have a stabilization function, characterized in that it is possible to, the following conditional expressions (1), 2) and internal focusing large-aperture telephoto macro lens that satisfies the (3).

(1) 0.38 <f1 / f <1.00
(2) 3.33 <β2 <8.79
(3) 0.34 <| f2 / f | <0.97

However,
f1 is a focal length of the first lens unit L1,
f is the focal length of the entire lens system when focusing on infinity,
β2 is the lateral magnification of the second lens unit L2 when focused at infinity,
f2 is a focal length of the second lens unit L2.
The fourth lens unit L4 includes, in order from the object side to the image plane side, a fourth F lens L4F having a negative refractive power and a fourth R lens L4R having a positive refractive power, and satisfies the following conditional expression (5): An inner focus type large-aperture telephoto macro lens having an image stabilization function according to claim 2 .

(5) 0.003 <f4R / f4 <0.070

However,
f4R is the focal length of the fourth R lens L4R,
f4 is a focal length of the fourth lens unit L4.
In order from the object side to the image plane side, a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, and a positive The fourth lens unit L4 having a refractive power, a fifth lens unit L5 having a negative refractive power, and a sixth lens unit L6 having a positive refractive power, are arranged to convert an object from infinity to a close object. At the time of focusing, the second lens unit L2 moves to the image plane side and at the same time, the third lens unit L3 moves to the object side, and the first lens unit L1, the fourth lens unit L4, and the fifth lens. The group L5 and the sixth lens group L6 are fixed with respect to the image plane, and the image is moved in the direction perpendicular to the optical axis by moving the fifth lens group L5 in a direction substantially perpendicular to the optical axis. have a stabilization function, characterized in that it is possible to, the fourth lens unit L4 Inner to order from the object side to the image side, wherein a first 4F lens L4F a negative refractive power and a second 4R lens L4R a positive refractive power, by satisfying the following conditional expression (5) Focus type large aperture telephoto macro lens.

(5) 0.003 <f4R / f4 <0.070
However,
f4R is the focal length of the fourth R lens L4R,
f4 is a focal length of the fourth lens unit L4.
The inner focus type large-aperture telephoto macro lens having an image stabilization function according to claim 4 , wherein the following conditional expression (3) is satisfied.

(3) 0.34 <| f2 / f | <0.97

However,
f is the focal length of the entire lens system when focusing on infinity,
f2 is a focal length of the second lens unit L2.
The inner focus type large-aperture telephoto macro lens having an image stabilization function according to any one of claims 1 to 5, wherein the third lens unit L3 includes at least one cemented lens.
The inner focus type large-aperture having an anti-vibration function according to any one of claims 1 to 6, wherein the third lens unit L3 satisfies the following conditional expression (4): Telephoto macro lens.
(4) 0.81 <(f3 · Fno) / f <1.90
However,
f3 is a focal length of the third lens unit L3,
Fno is the F value of the entire lens system when focusing on infinity,
f is the focal length of the entire lens system when focusing on infinity.
Any one of claims 1 to 7, characterized by satisfying the following conditional expression (6) and (7) 1
An inner focus type large-aperture telephoto macro lens having the vibration-proofing function described in the paragraph.

(6) 0.40 <| 1 / {β6 · (1-β5)} | <0.86
(7) 0.016 <β6 / β5 <0.052

However,
β6 is the lateral magnification of the sixth lens unit L6,
β5 is the lateral magnification of the fifth lens unit L5.
Said first lens unit L1 at least one positive lens including at least one negative lens, according to any one of claims 1 to 8, characterized by satisfying the following conditional expression (8) Inner focus type large aperture telephoto macro lens with anti-vibration function.

(8) θgFL1′−θgFL1 <0.050

However,
θgFL1 is an average value of partial dispersion ratios θgF regarding g-line and F-line of all positive lenses included in the first lens unit L1,
θgFL1 ′ is an average value of the partial dispersion ratio θgF regarding the g-line and the F-line of all the negative lenses included in the first lens unit L1,
The partial dispersion ratio θgF regarding the g line and the F line is expressed by the following equation.

θgF = (ng−nF) / (nF−nC)

However,
ng is the refractive index for g-line,
nF is the refractive index for F-line,
nC is a refractive index with respect to C line.

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