JPH05232383A - Wide-angle zoom lens - Google Patents

Abstract

PURPOSE:To obtain excellent image forming performance although a wide field angle range is included while maintaining simpler constitution by employing a zoom type which has a 1st positive lens group and a 2nd negative lens group and satisfying specific conditions. CONSTITUTION:The 1st lens group G1 consists of a front group GF with negative refracting power and a rear group GR with positive refracting power in order from the object side and the 2nd lens group has a positive lens which is convex to the image plane and a negative lens which is concave to the object side. Conditions shown by inequalities I-V1 are satisfied. Here, D2 is the on-axis distance from the most image-side lens surface in the front group GF of the 1st lens group G1 to the most object-side lens surface in the rear group GR, D3 the center thickness of the most object-side positive lens in the rear group GR of the 1st lens group G1, fw the focal length of the zoom lens at the wide-angle end, fF the focal length of the front group GF of the st lens group G1, f1 and f2 the focal lengths of the G1 and G2, and M the on-axis distance from the most object-side lens surface in the rear group GR of the G1 to the most image-side lens surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens suitable for a compact camera, and more particularly to a wide-angle zoom lens including a wide-angle range in which the total angle of view at the wide-angle end is about 80 °.

[0002]

2. Description of the Related Art Many conventional zoom lenses for compact cameras have been proposed in, for example, Japanese Patent Application Laid-Open No. 2-73322. Also, this kind of zoom lens
It consists of a first lens group having a positive refractive power and a second lens group having a negative refractive power, and zooming is achieved by changing the distance between the two lens groups.

[0003]

In recent years, there is an increasing demand for a wider angle of view for zoom lenses for compact cameras. However, the zoom lens proposed in the past has an angle of view of about 60 ° at the wide-angle end, which does not sufficiently satisfy the requirement for a wide angle.

A conventional two-group zoom lens composed of a positive first lens group G1 and a negative second lens group G2 as disclosed in Japanese Patent Laid-Open No. 2-73322 mentioned above has an angle of view of 80.
In order to obtain a wide angle of view of about ゜, it was difficult to secure the back focus at the wide-angle end and the space between the first lens group G1 and the second lens group G2 at the telephoto end at the same time. .. Further, if the focal length f1 of the first lens group G1 is shortened in order to achieve a wide angle of view, various aberrations are worsened accordingly. Therefore, in order to correct these various aberrations, the first lens group G1 had to have a complicated structure using a large number of lenses.

As described above, in the conventional positive / negative two-group zoom lens, it has been difficult to simply widen the angle while making the lens system compact. Therefore, in Japanese Patent Laid-Open No. 3-17650, the first lens group G1 is composed of a negative front group GF and a positive rear group GR, and a so-called retrofocus type is adopted. As a result, by arranging the rear principal point of the first lens group G1 at a position farther away from the image side than the most image side lens surface of the first lens group G1, ensuring the back focus at the wide angle end and the telephoto end. The first lens group G1 and the second
It has become possible to achieve the securing of the group spacing of the lens group G2 at the same time. In order to take such a structure, it is necessary to secure a certain distance between the negative front group GF and the positive rear group GR. This leads to an increase in the total length, and further an increase in the effective diameter of the negative lens group GF in order to secure the peripheral light amount. On the contrary, if the distance between the negative front lens group GF and the positive rear lens group GR is reduced in order to shorten the overall length, the refracting power of the negative front lens group GF is increased, which makes it difficult to correct aberrations.

Therefore, in the present invention, the positive first lens group G1
And a negative second lens group G2, which is a zoom type, and provides a wide-angle zoom lens having an excellent imaging performance while maintaining a simpler configuration and including a wide-angle range of about 80 °. The purpose is to

[0007]

In order to achieve the above object, the present invention, as shown in FIG. 1, includes, in order from the object side, a first lens group G1 having a positive refractive power and a second lens group G1 having a negative refractive power. Lens group G
In the zoom lens having 2 and zooming by changing the group distance between the first lens group G1 and the second lens group G2, the first lens group G1 is arranged in order from the object side before the negative refracting power. It consists of the group GF and the rear group GR of positive refractive power, and the front group GF
Has at least one negative lens, the rear group GR has at least two positive lenses, and the rear group GR has a positive lens having a convex surface facing the object side and a lens having a concave surface facing the object side. ,
The second lens group G2 has a positive lens, has a positive lens having a convex surface facing the image surface, and has a negative lens having a concave surface facing the object side. (1) 0.1 <D2 / fw <0.4 (2) 0.2 <D3 / fw <0.4 (3) 0.75 <| fF / fw | <1.12; fF <0 (4) 0.6 <f1 / fw <0.95 (5) 0.38 <M / fw <0.86 (6) 0.7 <| f2 / fw | <1.7; f2 <0 where D2: the most lens side of the front lens group GF in the front lens group GF of the first lens group G1 to the rear lens group GR. Axial distance to the lens surface on the object side D3: Center thickness of the most object-side positive lens in the rear group GR of the first lens group G1 fw: Focal length of zoom lens at wide-angle end fF: First lens group G1 Of the front lens group GF of the first lens group G1: focal length of the first lens group G1 M: axial distance from the lens surface closest to the object side to the lens surface closest to the image side in the rear group GR of the first lens group G1 f2: Focal length of the second lens group G2

[0008]

According to the present invention, by adopting the above structure, the distance between the negative front lens group GF and the positive rear lens group GR is changed, and the refractive power of the negative front lens group GF is not increased. We were able to achieve a compact lens system. Then, it becomes possible to secure the peripheral light amount at the wide-angle end while suppressing the expansion of the effective diameter of the negative front lens group GF. Further, in order to obtain good performance, it satisfies various conditional expressions. Each conditional expression will be described below.

First, the conditional expression (1) is defined by the first lens group G1.
It defines an appropriate range of the distance between the negative front group GF and the positive rear group GR. If the upper limit of conditional expression (1) is exceeded, the overall length will increase, and the effective diameter on the most object side of the negative front lens group GF will become large in order to secure peripheral light quantity at the wide-angle end, making it difficult to make it compact. Become. Further, since the height of incidence of the chief ray passing through the negative front lens group GF on the first lens surface becomes large, chromatic aberration of magnification in the negative direction becomes large, which is not preferable. On the contrary, if the lower limit of the conditional expression (1) is exceeded, the refracting power of each lens in the first lens group becomes strong due to the extreme compactness, and in particular, the fluctuation of the coma aberration generated in the negative front lens group GF becomes large. ..

Conditional expression (2) defines an appropriate range of the center thickness of the positive lens closest to the object in the positive rear lens group GR in the first lens group G1. When the upper limit of conditional expression (2) is exceeded, when the chromatic aberration of magnification at the wide-angle end and the telephoto end is suppressed, the chromatic aberration of magnification remains positive during zooming, especially in the intermediate focal length state, and large fluctuations cannot be corrected. Further, an increase in the center thickness of the lens causes a drawback of an increase in weight.
On the contrary, when the value goes below the lower limit of the conditional expression (2), the bending of the chromatic aberration of magnification at the wide-angle end becomes large and tends to be positive, which causes deterioration of the coma aberration relating to color.

Conditional expression (3) defines the optimum range of the focal length of the negative front lens group GF in the first lens group G1. If the upper limit of conditional expression (3) is exceeded, the refractive power of the negative front lens group GF will be weakened, and the effect of the retrofocus type will be diminished in the entire first lens group G1. This makes it difficult to position the rear principal point of the first lens group G1 farther away from the image surface than the most image side lens surface of the first lens group G1. It is not preferable because it is difficult to achieve the securing and the securing of the group distance between the first lens group G1 and the second lens group G2 at the telephoto end at the same time. On the other hand, if the lower limit of conditional expression (3) is exceeded, the refracting power of the negative front lens group GF becomes too strong, and it becomes difficult to correct coma at the wide-angle end. Further, there is a drawback that the mutual eccentricity tolerance between the negative front group GF and the positive rear group GR becomes severe.

In order to correct various aberrations in good balance, the rear lens group GR of the first lens group G1 includes a positive lens having a convex surface facing the object side, a lens having a concave surface facing the object side, and a positive lens. It is desirable to have a further group GR
It is more desirable that the lens with the concave surface facing the object side is a negative lens. In this way, the rear group GR is positive / negative /
With the configuration having a positive lens, the refractive power arrangement of the first lens group G1 as a whole becomes negative / positive / negative / positive, which is an arrangement suitable for correcting various aberrations in a well-balanced manner. Particularly, the most object-side positive lens in the rear group GR has a function of correcting coma aberration generated in the front group GF, and the lens having a concave surface facing the object side in the rear group GR is the front group GF.
At the same time, it has a function of correcting in a well-balanced manner the positive distortion that occurs in the negative second lens group G2 at the wide-angle end.

Further, it is more desirable to satisfy the conditional expressions (4) and (5) in order to achieve a better balanced aberration correction. Conditional expression (4) defines the optimum focal length of the first lens group G1. When the upper limit of conditional expression (4) is exceeded, the imaging magnification β of the second lens group G2 at the wide-angle end becomes close to 1, and at the wide-angle end, the second lens group G2 remarkably approaches the image plane. It is not preferable because the back focus cannot be sufficiently secured. On the other hand, if the lower limit of conditional expression (4) is exceeded, the refracting power of the first lens group G1 will become excessive, and it will be difficult to satisfactorily correct various aberrations such as spherical aberration, field curvature, astigmatism, and coma. Become. In order to make it easier to correct various aberrations and to keep the number of lens components of the first lens group G1 small, it is desirable to set the lower limit of conditional expression (4) to 0.7.

Conditional expression (5) is defined by the rear group G of the first lens group G1.
It defines the optimum distance from the most object side lens surface of R to the most image side lens surface. If the upper limit of conditional expression (5) is exceeded, the axial thickness of the first lens group G1 becomes large, which leads to an increase in the size of the entire lens system, which is not preferable. On the contrary, if the rear group GR of the first lens group G1 is made smaller than the lower limit of conditional expression (5), off-axis aberrations such as distortion and coma are deteriorated, so that good imaging performance is obtained. Hard to get.

Incidentally, it is preferable that the second lens group G2 has a positive / negative lens structure in order from the object side in order to correct various aberrations and secure a back focus. Particularly, if the image side surface of the positive lens of the second lens group G2 is made convex and the object side surface of the negative lens is made concave, it is suitable for correction of distortion and coma. It is more preferable that the conditional expression (6) is further satisfied.

Conditional expression (6) defines the optimum focal length of the second lens group G2 in order to simultaneously correct various aberrations and secure a zoom ratio. If the upper limit of conditional expression (6) is exceeded, the refracting power of the second lens group G2 becomes weak, and the amount of movement of the second lens group G2 during zooming increases. As a result, when trying to obtain a desired zoom ratio, it is difficult to obtain a sufficient zoom ratio because the first lens group G1 and the second lens group G2 mechanically interfere with each other. On the other hand, if the lower limit of conditional expression (6) is exceeded, the refractive power of the second lens group G2 becomes large, and the desired zoom ratio can be obtained with a small amount of movement, which is advantageous for achieving a high zoom ratio. It is not preferable because it becomes difficult to correct various aberrations such as distortion and coma. Also, the first
The mutual decentering tolerance between the lens group G1 and the second lens group G2 becomes strict, which is not preferable. If any of the lens surfaces in the second lens group G2 is aspherical, it is effective in correcting various off-axis aberrations such as distortion, coma, and field curvature.

In order to satisfactorily correct lateral chromatic aberration, it is more preferable that the Abbe number of the negative lens in the front lens group GF of the first lens group G1 is νd and the following conditional expression (7) is satisfied. (7) νd ＞ 50

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 7 show the first to seventh aspects of the present invention.
FIG. 1 is a lens configuration diagram of an example, and each example is a wide-angle zoom lens having a two-group configuration including a first lens group G1 having a positive refractive power and a second lens group having a negative refractive power. The first lens group G1 is basically composed of a front lens group GF having a negative refractive power and a rear lens group GR having a positive refractive power, and the front lens group GF is composed of a negative meniscus lens LF1 having a convex surface directed toward the object side. The rear lens group GR is a cemented lens of a biconvex positive lens LR1, a biconcave negative lens LR2 and a biconvex positive lens LR3, and is a meniscus-shaped cemented negative lens whose concave surface faces the object side as a whole.
The second lens group G is composed of a biconvex positive lens LR4.
2 is a positive meniscus lens L21 having a convex surface facing the image side,
And a negative meniscus lens L22 having a concave surface facing the object side.

The first to seventh examples have basically the same lens construction, and in order to correct various off-axis aberrations in a better balance, the negative meniscus lens L22 in the second lens group is used. An aspherical surface is provided on the side surface of the object. Further, in the zooming from the wide-angle end to the telephoto end, as shown in FIGS. 1 to 7 in each of the embodiments, both lens groups are arranged so that the group distance between the first lens group G1 and the second lens group G2 is reduced. Move to the object side. In each embodiment, the diaphragm S is disposed on the image side of the first lens group G1 and moves integrally with the first lens group G1 during zooming.

In the following, the values of specifications and the numerical values corresponding to the conditions of the respective embodiments of the present invention will be listed in order. However, the number at the left end of the specifications table indicates the order from the object side, and r
Is the radius of curvature of the lens surface, d is the lens surface spacing, ν is the Abbe number, n is the refractive index at the d line (λ = 587.6 nm), 2ω is the angle of view, FNO is the F number, and f is the focal length of the entire system. It represents.

Further, the aspherical surface shown in the specification values is a distance X (h) from the tangent plane of the apex of each aspherical surface at a height h in the vertical direction from the optical axis, and is defined as a reference value. Let r be the paraxial radius of curvature of k, k be the conic constant, and c n be the aspherical coefficient of order n.

[0022]

[Equation 1]

It is represented by.

[0024]

[Table 1] Specifications of the first embodiment 2ω = 81.3 ° to 49.9 °, FNO = 4.08 to 7.82 (Variable distance in zooming) f 24.7000 35.0000 47.0000 d 9 13.2523 7.3493 3.7351 d13 6.3891 19.7808 35.3828 (Aspherical shape of the 10th surface of the first embodiment) Conic constant k = .1000 × 10 aspherical coefficient c 2 = .0000 c 4 = .3439 × 10 ^-4 c 6 = .1040 × 10 ^-6 c 8 = .1110 × 10 ^-8 c10 = .1862 × 10 ^-10 (Values corresponding to conditions) (1) D2 / fw = 0.133 (2) D3 / fw = 0.219 (3) | fF / fw | = 0.838 (4) f1 / fw = 0.790 (5) M / fw = 0.664 (6) | f2 / fw | = 1.028 (7) νd = 55.60

[0025]

[Table 2] Specifications of the second embodiment 2ω = 81.2 ° to 50.1 °, FNO = 4.08 to 7.83 (Variable distance in zooming) f 24.7000 35.0000 47.0000 d 9 13.2618 7.3674 3.7585 d13 7.0341 21.0606 37.4022 (Aspherical shape of the 10th surface of the second embodiment) Conic constant k = .1000 × 10 aspherical coefficient c 2 = .0000 c 4 = .3149 × 10 ^-4 c 6 = .2485 × 10 ^-7 c 8 = .3372 × 10 ^-8 c10 = .8716 × 10 ^-11 (Values corresponding to conditions) (1) D2 / fw = 0.150 (2) D3 / fw = 0.263 (3) | fF / fw | = 0.804 (4) f1 / fw = 0.772 (5) M / fw = 0.668 (6) | f2 / fw | = 1.051 (7) νd = 55.60

[0026]

[Table 3] Specifications of the third embodiment 2ω = 81.3 ° to 49.9 °, FNO = 4.10 to 7.87 (Variable distance in zooming) f 24.7000 35.0000 47.0000 d 9 13.3040 7.3914 3.7713 d13 7.0230 20.7253 36.6891 (Aspherical shape of the 10th surface of the third embodiment) Conic constant k = .1000 × 10 aspherical coefficient c 2 = .0000 c 4 = .2758 × 10 ^-4 c 6 = .1565 × 10 ^-6 c 8 = .1325 × 10 ^-8 c10 = .6892 × 10 ^-11 (Values corresponding to conditions) (1) D2 / fw = 0.133 (2) D3 / fw = 0.227 (3) | fF / fw | = 0.760 (4) f1 / fw = 0.782 (5) M / fw = 0.664 (6) | f2 / fw | = 1.040 (7) νd = 55.60

[0027]

[Table 4] Specifications of the fourth embodiment 2ω = 81.2 ° to 49.8 °, FNO = 4.08 to 7.82 (Variable distance in zooming) f 24.7000 35.0000 47.0000 d 9 13.2718 7.3725 3.7606 d13 5.9704 19.2136 34.6425 (Aspherical shape of the 10th surface of the fourth embodiment) Conic constant k = .1000E × 10 Aspherical coefficient c 2 = .0000 c 4 = .3207 × 10 ^-4 c 6 = .1167 × 10 ^-6 c 8 = .1127 × 10 ^-8 c10 = .1492 × 10 ^-10 (Values corresponding to conditions) (1) D2 / fw = 0.133 (2) D3 / fw = 0.232 (3) | fF / fw | = 0.833 (4) f1 / fw = 0.794 (5) M / fw = 0.670 (6) | f2 / fw | = 1.022 (7) νd = 55.60

[0028]

[Table 5] Specifications of the fifth embodiment 2ω = 81.2 ° to 49.7 ° FNO = 4.08 to 7.82 (Variable spacing in zooming) f 24.7000 35.0000 47.0000 d 9 13.1481 7.3266 3.7623 d13 5.6707 18.9887 34.5049 (Aspherical shape of the 10th surface of the fifth embodiment) Conic constant k = .1000 × 10 aspherical coefficient c 2 = .0000 c 4 = .3906 × 10 ^-4 c 6 = .414 1 × 10 ^-6 c 8 =-. 1854 × 10 ^-8 c10 = .3529 × 10 ^-10 (Values corresponding to conditions) (1) D2 / fw = 0. 133 (2) D3 / fw = 0.263 (3) | fF / fw | = 0.869 (4) f1 / fw = 0.787 (5) M / fw = 0.696 (6) | f2 / fw │ = 1.018 (7) νd = 60.14

[0029]

[Table 6] Specifications of the sixth embodiment 2ω = 80.9 ° to 49.7 °, FNO = 3.96 to 7.60 (Variable spacing in zooming) f 24.6992 35.0000 47.0018 d 9 13.3720 7.5415 3.9717 d13 5.6017 18.8215 34.2242 (Aspherical shape of the 10th surface of the sixth embodiment) Conic constant k = .1000 × 10 aspherical coefficient c 2 = .0000 c 4 = .3784 × 10 ^-4 c 6 = .69 40 × 10 ^-6 c 8 =-. 4462 × 10 ^-8 c10 = .5012 × 10 ^-10 (Values corresponding to conditions) (1) D2 / fw = 0. 300 (2) D3 / fw = 0.202 (3) | fF / fw | = 1.115 (4) f1 / fw = 0.791 (5) M / fw = 0.675 (6) | f2 / fw │ = 1.015 (7) νd = 60.64

[0030]

[Table 7] Specifications of the seventh embodiment 2ω = 81.2 ° to 49.8 °, FNO = 4.00 to 7.66 (Variable spacing during zooming) f 24.7000 35.0002 47.0006 d 9 13.3694 7.5413 3.9729 d13 5.6023 18.9256 34.4481 (Aspherical shape of the 10th surface of the seventh embodiment) Conic constant k = .1000 × 10 aspherical coefficient c 2 = .0000 c4 = .3777 × 10 ^-4 c 6 = .8613 × 10 ^-6 c 8 =-. 7697 × 10 ^-8 c10 = .6687 × 10 ^-10 (Values corresponding to conditions) (1) D2 / fw = 0. 263 (2) D3 / fw = 0.259 (3) | fF / fw | = 0.994 (4) f1 / fw = 0.787 (5) M / fw = 0.680 (6) | f2 / fw │ = 1.018 (7) ν d = 60.64 From the values of the specifications of each embodiment or more, it can be seen that the lens system of each embodiment is compactly configured with a small number of lens components of about 7 lenses. I understand.

Further, various aberration diagrams at the wide angle end in the first to seventh examples are shown in FIGS. 8, 11, 14, and 17, respectively.
It is shown in FIGS. 20, 23, and 26. FIGS. 9, 12, 15, 18, 21, and 24 are graphs showing various aberrations in the intermediate focal length state in the first to seventh examples, respectively.
It is shown in FIG. Then, various aberration diagrams at the telephoto end in the first to seventh examples are shown in FIGS. 10, 13, and 1, respectively.
6, FIG. 19, FIG. 22, FIG. 25, and FIG. The dotted line in each aberration diagram shows the meridional image plane, and the solid line shows the sagittal image plane.

From each of the aberration diagrams, it can be seen that the image forming performance is excellent from the wide-angle end to the telephoto end, even though the wide angle of view reaches 80 ° at the wide-angle end.

[0033]

As described above, according to the present invention, it is possible to provide a wide-angle zoom lens which is compact and has an angle of view of up to 80 ° and which has excellent image forming performance from the wide-angle end to the telephoto end.

[Brief description of drawings]

FIG. 1 is a lens configuration diagram of a first embodiment according to the present invention.

FIG. 2 is a lens configuration diagram of a second embodiment according to the present invention.

FIG. 3 is a lens configuration diagram of a third embodiment according to the present invention.

FIG. 4 is a lens configuration diagram of a fourth embodiment according to the present invention.

FIG. 5 is a lens configuration diagram of a fifth embodiment according to the present invention.

FIG. 6 is a lens configuration diagram of a sixth embodiment according to the present invention.

FIG. 7 is a lens configuration diagram of a seventh embodiment according to the present invention.

FIG. 8 is a diagram of various types of aberration at the wide-angle end according to the first example of the present invention.

FIG. 9 is a diagram of various types of aberration in the intermediate focal length state of Example 1 according to the present invention.

FIG. 10 is a diagram of various types of aberration at the telephoto end of the first embodiment according to the present invention.

FIG. 11 is a diagram of various types of aberration at the wide-angle end according to the second example of the present invention.

FIG. 12 is a diagram of various types of aberration in the intermediate focal length state of the second example according to the present invention.

FIG. 13 is a diagram of various types of aberration at the telephoto end of the second embodiment according to the present invention.

FIG. 14 is a diagram of various types of aberration at the wide-angle end according to the third example of the present invention.

FIG. 15 is a diagram of various types of aberration in the intermediate focal length state of the third example according to the present invention.

FIG. 16 is a diagram of various types of aberration at the telephoto end of the third embodiment according to the present invention.

FIG. 17 is a diagram of various types of aberration at the wide-angle end according to the fourth example of the present invention.

FIG. 18 is a diagram of various types of aberration in the intermediate focal length state of the fourth example according to the present invention.

FIG. 19 is a diagram of various types of aberration at the telephoto end of the fourth embodiment according to the present invention.

FIG. 20 is a diagram of various types of aberration at the wide-angle end according to the fifth example of the present invention.

FIG. 21 is a diagram of various types of aberration in the intermediate focal length state of the fifth example according to the present invention.

FIG. 22 is a diagram of various types of aberration at the telephoto end of the fifth embodiment according to the present invention.

FIG. 23 is a diagram of various types of aberration at the wide-angle end according to the sixth example of the present invention.

FIG. 24 is a diagram of various types of aberration in the intermediate focal length state of the sixth example according to the present invention.

FIG. 25 is a diagram of various types of aberration at the telephoto end of the sixth embodiment according to the present invention.

FIG. 26 is a diagram of various types of aberration at the wide-angle end according to the seventh example of the present invention.

FIG. 27 is a diagram of various types of aberration in the intermediate focal length state of the seventh example according to the present invention.

FIG. 28 is a diagram of various types of aberration at the telephoto end of the seventh example according to the present invention.

[Explanation of symbols for main parts]

 G1 ・ ・ ・ ・ ・ ・ First lens group G2 ・ ・ ・ ・ ・ ・ Second lens group GF ・ ・ ・ ・ ・ ・ Front group GR ・ ・ ・ ・ ・ ・ Rear group dM ・..... d-line meridional image plane dS .....- d-line sagittal image plane gM .....- g-line meridional image plane gS .. ..G-line sagittal image plane

Claims (3)

[Claims] 1. A first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power, which are arranged in this order from the object side, the first lens group G1 and the second lens group G2. In the zoom lens for changing the magnification by changing the interval of, the first lens group G1 is composed of, in order from the object side, a front lens group GF having a negative refractive power and a rear lens group GR having a positive refractive power. The front group GF has at least one negative lens, and the rear group G
R is a wide-angle zoom lens characterized by having at least two positive lenses and satisfying the following conditions. (1) 0.1 <D2 / fw <0.4 (2) 0.2 <D3 / fw <0.4 (3) 0.75 <| fF / fw | <1.12; fF <0 However, D2: in the front lens group GF of the first lens group G1 Distance from the lens surface closest to the image side to the lens surface closest to the object in the rear lens group fw: Focal length of the zoom lens at the wide-angle end D3: Most object in the rear lens group GR of the first lens group G1 Thickness of the positive lens on the side fF: Focal length of the front lens group GF of the first lens group G1 2. The rear lens group GR has a positive lens having a convex surface facing the object side, a lens having a concave surface facing the object side, and a positive lens, and further satisfies the following conditions. The wide-angle zoom lens according to claim 1. (4) 0.6 <f1 / fw <0.95 (5) 0.38 <M / fw <0.86 where f1 is the focal length of the first lens group G1 M is the lens closest to the object in the rear lens group GR of the first lens group G1 On-axis distance from the surface to the lens surface closest to the image 3. The second lens group G2 comprises, in order from the object side, a positive lens having a convex surface facing the image surface and a negative lens having a concave surface facing the object side, and further satisfying the following conditions. The wide-angle zoom lens according to claim 2. (6) 0.7 <| f2 / fw | <1.7; f2 <0 where f2: focal length of the second lens group G2