Compact high-magnification macro lens
By designing a compact high-magnification macro lens, a three-component zoom structure and a reasonable lens combination, the problem of low imaging resolution of existing macro lenses is solved, and high-performance imaging effects and cost-effective lens design are achieved.
Patent Information
- Application Number
- CN202421900576.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-08-07
AI Technical Summary
Existing macro lenses are difficult to achieve high-magnification imaging, resulting in low imaging resolution and resolution aberration, which has certain design difficulty.
A compact high-magnification macro lens is designed, adopting a three-component zoom structure, and by adjusting the movement of the second lens group along the optical axis, the focus at different object distances is achieved. At the same time, by reasonably allocating the power and lens design, chromatic aberration and aberration are reduced and imaging resolution is improved.
It realizes that the distance from infinity to 2 times the photography magnification can achieve high-performance imaging effects, with total optical length, light weight and low cost.
Smart Images
Figure CN222838273U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical lenses, in particular to a compact high-magnification macro lens. Background Art
[0002] A macro lens is a special lens used for macro photography, mainly used to shoot very fine objects, such as flowers, ornaments, object textures and other close-ups. Magnification is one of the basic specifications of a macro lens, which is used to indicate the ratio of the image to the actual size. At present, it is generally difficult for macro lenses to achieve higher magnifications. The aberration of high-magnification lenses will increase significantly, resulting in low imaging resolution and resolution aberrations, so it is difficult to design. Utility Model Content
[0003] The embodiment of the utility model provides a compact high-magnification macro lens, which can achieve high-performance imaging effect at a photographic magnification ranging from infinity to 2 times of the object distance, and has a short total optical length, light weight and low cost.
[0004] The embodiment of the utility model provides a compact high-magnification macro lens, comprising a first lens group with positive focal length, a second lens group with positive focal length, an aperture, and a third lens group with negative focal length, which are arranged in sequence from the object side to the image side along the optical axis;
[0005] The first lens group includes a first lens and a second lens arranged in sequence;
[0006] The second lens group includes a third lens with positive power, a fourth lens with positive power, a fifth lens with negative power, a sixth lens with positive power or negative power, a seventh lens with positive power or negative power, an eighth lens with negative power and a ninth lens with positive power, which are arranged in sequence;
[0007] The third lens group includes a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens arranged in sequence;
[0008] In the process of focusing from infinity to close distance, the second lens group moves along the optical axis toward the object side, and the first lens group and the third lens group are fixed.
[0009] Optionally, the first lens and the second lens are cemented together, the fifth lens and the sixth lens are cemented together, and the eleventh lens and the twelfth lens are cemented together.
[0010] Optionally, the fourth lens, the tenth lens and the thirteenth lens are all meniscus lenses;
[0011] And / or, the third lens and the fourteenth lens are both biconvex lenses.
[0012] Optionally, the sixth lens L6 and the fourteenth lens L14 are made of ED dispersion glass.
[0013] Optionally, the focal length of the second lens group is Φ2, and the focal length of the macro lens is Φ, satisfying:
[0014] 1.9<Φ2 / Φ<2.2.
[0015] Optionally, the focal power of the second lens group is Φ2, and the focal power of the third lens group is Φ3, satisfying:
[0016] -1.3<Φ2 / Φ3<-1.1.
[0017] Optionally, in the process of focusing from infinity to close distance, the movement amount of the second lens group is ZOL, and the focal length of the macro lens when the object distance is infinite is f, which satisfies:
[0018] 0.40 <ZOL / f<0.48。
[0019] Optionally, the clear aperture of the first lens is D1, and the distance from the object side surface to the image plane of the first lens is TTL, satisfying:
[0020] 0.28 <D1 / TTL<0.34。
[0021] Optionally, the focal power of the third lens is ΦL3, the focal power of the fourteenth lens is ΦL14, and the focal power of the macro lens is Φ, satisfying:
[0022] 1.0<ΦL3 / Φ<1.6; 1.8<ΦL14 / Φ<2.3.
[0023] Optionally, it is composed of 14 lenses, and the 14 lenses are the first lens to the fourteenth lens;
[0024] All 14 lenses are glass lenses.
[0025] The macro lens provided by the embodiment of the utility model adopts a three-element zoom structure. When the object distance changes, the focus at different object distances is achieved by adjusting the movement of the second lens group along the optical axis, so that the macro lens can image clearly. Through the design of the focal power of the first lens group, the second lens group with positive focal power, and the third lens group with negative focal power, the design of the position of the diaphragm, and the design of the lenses in the first lens group, the second lens group, and the third lens group, the focal power is reasonably distributed, and a macro lens that can achieve high-performance imaging effects at a photographic magnification from infinity to 2 times the object distance is provided, with a short total optical length, light weight, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1Schematic diagram of the structure of the macro lens in Embodiment 1;
[0027] Figure 2 is a field curvature distortion curve diagram of the macro lens at infinite object distance in Example 1;
[0028] Figure 3 is a field curvature distortion curve diagram of the macro lens at a close object distance in Example 1;
[0029] Figure 4 axial aberration diagram of the macro lens at infinite object distance in Example 1;
[0030] Figure 5 is an axial aberration diagram of the macro lens at close object distance in Example 1;
[0031] Figure 6 Schematic diagram of the structure of the macro lens in Embodiment 2;
[0032] Figure 7 is a field curvature distortion curve diagram of the macro lens at infinite object distance in Example 2;
[0033] Figure 8 is a field curvature distortion curve diagram of the macro lens at close object distance in Example 2;
[0034] Fig. 9 axial aberration diagram of the macro lens at infinite object distance in Example 2;
[0035] Fig.10 axial aberration diagram of the macro lens at close object distance in Example 2;
[0036] Fig.11 Schematic diagram of the structure of the macro lens in Embodiment 3;
[0037] Fig.12 is a field curvature distortion curve diagram of the macro lens at infinite object distance in Example 3;
[0038] Fig.13 is a field curvature distortion curve diagram of the macro lens at close object distance in Example 3;
[0039] Fig.14 axial aberration diagram of the macro lens at infinite object distance in Example 3;
[0040] Fig.15 This is the axial aberration diagram of the macro lens at close object distance in Example 3. DETAILED DESCRIPTION
[0041] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0042] Embodiment 1
[0043] Figure 1 is a schematic diagram of the structure of the macro lens in Example 1, referring to Figure 1 The compact high-power macro lens includes a first lens group G1 with positive power, a second lens group G2 with positive power, an aperture STP and a third lens group G3 with negative power, which are arranged in sequence from the object side to the image side along the optical axis. The first lens group G1 includes a first lens L1 and a second lens L2 arranged in sequence. The second lens group G2 includes a third lens L3 with positive power, a fourth lens L4 with positive power, a fifth lens L5 with negative power, a sixth lens L6 with positive power or negative power, a seventh lens L7 with positive power or negative power, an eighth lens L8 with negative power and a ninth lens L9 with positive power, which are arranged in sequence. The third lens group G3 includes a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13 and a fourteenth lens L14 arranged in sequence. In the process of focusing from infinity to close distance, the second lens group G2 moves along the optical axis toward the object side, and the first lens group G1 and the third lens group G3 are fixed.
[0044] The macro lens provided by the embodiment of the utility model adopts a three-element zoom structure. When the object distance changes, the focus at different object distances is achieved by adjusting the movement of the second lens group G2 along the optical axis, so that the macro lens can image clearly. Through the design of the focal power of the first lens group G1, the second lens group G2 with positive focal power, and the third lens group G3 with negative focal power, the design of the position of the aperture STP, and the design of the lenses in the first lens group G1, the second lens group G2, and the third lens group G3, the focal power is reasonably distributed, and a macro lens that can achieve high-performance imaging effects at a photographic magnification from infinity to 2 times of the object distance is provided, with a short total optical length, light weight, and low cost.
[0045] For example, the focal length of the macro lens can reach 100 mm when the object distance is infinite, and the total optical length is as short as 144 mm. The total optical length refers to the distance from the object side of the first lens L1 to the image plane Image.
[0046] Optionally, refer to Figure 1, the first lens L1 and the second lens L2 are cemented to correct the chromatic aberration of the first lens group G1. The fifth lens L5 and the sixth lens L6 are cemented to correct the chromatic aberration of the second lens group G2. The eleventh lens L11 and the twelfth lens L12 are cemented to correct the chromatic aberration of the third lens group G3. Thus, a cemented lens is provided in each lens group to correct the chromatic aberration of each lens group. And the chromatic aberration of the macro lens is corrected as a whole.
[0047] Optionally, refer to Figure 1 The fourth lens L4, the tenth lens L10 and the thirteenth lens L13 are all meniscus lenses to correct the field curvature of the macro lens.
[0048] Optionally, the third lens L3 and the fourteenth lens L14 are both biconvex lenses. The object side surface of the third lens L3 is convex toward the object side, and the image side surface of the third lens L3 is convex toward the image side. The object side surface of the fourteenth lens L14 is convex toward the object side, and the image side surface of the fourteenth lens L14 is convex toward the image side.
[0049] Optionally, since the close object distance of the macro lens is very short, a very high resolution is required to take a clear picture, and chromatic aberration in this macro lens is a major factor affecting the imaging resolution. Chromatic aberration accounts for a relatively large proportion of all aberrations in this macro lens. Therefore, in the embodiment of the utility model, the sixth lens L6 and the fourteenth lens L14 use ED dispersion glass. ED dispersion glass can promote the actual focusing of light of various wavelengths on the same point, reduce the chromatic aberration produced by the macro lens, and the characteristics of low dispersion light wavelength, and then through reasonable material matching with other lenses, reduce chromatic aberration and improve color reproduction.
[0050] Optionally, the macro lens is focused by moving the second lens group G2. The focal power of the second lens group is Φ2, and the focal power of the macro lens is Φ, which satisfies: 1.9<Φ2 / Φ<2.2. This ensures that the image quality deteriorates less during the focusing process. If Φ2 / Φ≤1.9, the image quality of the macro lens at different object distances during the focusing process is quite different, and it is difficult to achieve clear imaging at close object distances. If Φ2 / Φ≥2.2, the amount of residual aberration correction that the first lens group G1 and the third lens group G3 need to bear increases.
[0051] Optionally, the focal power of the second lens group G2 is Φ2, and the focal power of the third lens group G3 is Φ3, satisfying:
[0052] -1.3<Φ2 / Φ3<-1.1. By constraining the focal length of the zoom group (i.e., the second lens group G2) and the fixed group (i.e., the third lens group G3), the aberration distribution balance of each lens group can be effectively controlled, which is beneficial to ensuring the image quality of the macro lens during the focusing process and balancing the overall aberration of the macro lens.
[0053] Optionally, during the focusing process of the object distance from infinity to a close distance, the movement amount of the second lens group G2 is ZOL, and the focal length of the macro lens in the state where the object distance is infinite is f, satisfying: 0.40 < ZOL / f < 0.48. This requirement restricts the movement range of the second lens group G2. Within this constraint clause, it is avoided that the movement range of the second lens group G2 is too large, resulting in difficulty in compressing the overall length of the lens. When 0.40 < ZOL / f < 0.48 is satisfied, the overall optical length of the macro lens is reduced.
[0054] Optionally, the clear aperture of the first lens L1 is D1, and the distance from the object side of the first lens L1 to the image plane Image is TTL, satisfying: 0.28 < D1 / TTL < 0.34. By controlling the size of the clear aperture of the first lens L1, it is beneficial to reduce the volume of the macro lens, further avoids the excessive overall optical length of the macro lens due to the too large clear aperture of the first lens L1, and is beneficial to reducing the weight of the macro lens.
[0055] Optionally, the optical power of the third lens is ΦL3, the optical power of the fourteenth lens is ΦL14, and the optical power of the macro lens is Φ, satisfying: 1.0 < ΦL3 / Φ < 1.6; 1.8 < ΦL14 / Φ < 2.3. The off-axis ray heights of the third lens L3 before the diaphragm STP and the fourteenth lens L14 after the diaphragm STP are both relatively high, and the influence on aberration is more obvious. By restricting 1.0 < ΦL3 / Φ < 1.6 and 1.8 < ΦL14 / Φ < 2.3, the optical powers of the third lens L3 and the fourteenth lens L14 are restricted within this range, which can effectively converge the ray heights at both ends of the entire macro lens, reduce off-axis aberration, and improve the resolution of the macro lens.
[0056] Optionally, the macro lens is composed of 14 lenses. The 14 lenses are the first lens L1 to the fourteenth lens L14. That is to say, the 14 lenses are the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, and the fourteenth lens L14. All 14 lenses are glass lenses. The macro lens adopts a 14G all-glass structure. Through the combination of lens materials and the reasonable distribution of optical power, a macro lens with high-performance imaging effects, short overall optical length, light weight, and low cost can be achieved for object distances from infinity to a 2-fold photographic magnification.
[0057] Exemplarily, referring to Figure 1 , a flat glass can also be provided on the side of the fourteenth lens L14 away from the first lens L1. The flat glass can include, for example, a flat filter and a protective glass.
[0058] Table 1 A design value of the macro lens in Example 1
[0059] Surface number Face type Radius of curvature thickness Refractive Index Abbe number Object INF INF 1 Spherical 313.0985 1.1661 1.76231 26.297 2 Spherical 121.7247 3.3700 1.96361 26.707 3 Spherical 403.4226 d1 4 Spherical 80.3640 5.0021 1.80487 45.897 5 Spherical -236.6094 0.1012 6 Spherical 38.2245 4.8611 1.72002 53.324 7 Spherical 109.6457 2.5555 8 Spherical -180.7488 4.1596 1.70536 33.679 9 Spherical 31.6666 6.6502 1.47397 86.651 10 Spherical -92.8032 1.9862 11 Spherical -37.4897 4.5138 1.98627 20.518 12 Spherical -38.5458 0.1035 13 Spherical 43.7177 1.1974 1.93646 29.863 14 Spherical 26.2953 2.9848 15 Spherical 42.1555 3.1918 1.70119 52.727 16 Spherical 525.0331 1.1257 STP Aperture INF d2 18 Spherical 81.7650 1.2049 2.03933 27.8 19 Spherical 22.9830 3.6069 20 Spherical -37.2826 2.2516 1.55877 32.087 21 Spherical 23.7106 9.0121 1.69005 24.078 22 Spherical -31.9397 8.3649 23 Spherical -24.1987 1.1997 1.71128 94.99 24 Spherical -113.5767 0.1001 25 Spherical 42.9249 9.4217 1.55264 94.99 26 Spherical -91.2839 14.8774 27 flat INF 2.0000 1.5168 64.199 28 flat INF 1.0000 Image INF
[0060] Table 1 shows a design value of the macro lens in Example 1, and its specific value can be adjusted according to product requirements and is not a limitation of the embodiment of the utility model. The macro lens shown in Table 1 can be Figure 1 As shown in . A lens generally includes two surfaces, each of which is a refractive surface. The surface numbers in Table 1 are numbered according to the surfaces of each lens. Among them, surface number 1 represents the object side of the first lens L1, surface number 2 represents the image side of the first lens L1, and so on, which will not be repeated here. It should be noted that STO in the surface number column represents the plane where the aperture Stop is located. Object in the surface number column represents the object surface. Image in the surface number column represents the image surface. The radius of curvature represents the degree of curvature of the lens surface. A positive radius of curvature value represents that the center of curvature is on the side of the surface close to the image side, and a negative radius of curvature value represents that the center of curvature is on the side of the surface away from the image side. INF in the radius of curvature column represents that the surface is a plane. The unit of the radius of curvature is mm. The value in the thickness column represents the axial distance from the current surface to the next surface. The unit of thickness is mm. The refractive index column represents the refractive index of the medium between the current surface and the next surface. The blank in the refractive index column is the refractive index of air, and the refractive index of air is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and the space represents that the current position is air.
[0061] In Example 1, when the object distance is infinity, the focal length of the macro lens is 98.47 mm. When the object distance is infinity, d1 is 46.7847 mm. When the object distance is infinity, d2 is 1 mm. The object distance can be as close as 82.547 mm. When the object distance is 82.547 mm, the focal length of the macro lens is 37.03 mm. When the object distance is 82.547 mm, d1 is 1.01 mm. When the object distance is 82.547 mm, d2 is 46.7726 mm.
[0062] In the embodiment of the macro lens shown in Table 1, Φ2 / Φ=2.0197, Φ2 / Φ3=-1.2669, ZOL / f=0.4649, D1 / TTL=0.3079, ΦL3 / Φ=1.3126, ΦL14 / Φ=1.8183.
[0063] Embodiment 2
[0064] Table 2 A design value of the macro lens in Example 2
[0065] Surface number Face type Radius of curvature thickness Refractive Index Abbe number Object INF INF 1 Spherical 366.3489 1.3330 1.95159 94.99 2 Spherical 356.3474 1.9758 1.99086 19.948 3 Spherical 450.3893 D1 4 Spherical 59.1958 6.0701 1.83844 42.414 5 Spherical -489.8270 0.1667 6 Spherical 42.1304 4.2874 1.71307 59.103 7 Spherical 90.7266 2.0519 8 Spherical -2842.1141 1.1713 1.67971 31.342 9 Spherical 32.5630 7.2266 1.47593 87.39 10 Spherical -109.7558 0.0993 11 Spherical -115.9429 2.2405 1.93507 33.964 12 Spherical 407.2803 8.5534 13 Spherical 31.7881 1.1631 1.91173 26.585 14 Spherical 24.1393 3.4713 15 Spherical 43.4040 3.3475 1.77661 44.711 16 Spherical -470.2442 1.0079 STP Aperture INF D2 18 Spherical 70.8611 1.2352 2.04283 31.309 19 Spherical 22.5412 2.6840 20 Spherical -70.8903 8.9202 1.82761 23.241 21 Spherical -16.2755 4.9850 1.59361 44.82 22 Spherical -371.5562 4.9616 23 Spherical -18.5975 1.1498 1.87214 50.897 24 Spherical -32.1667 0.0999 25 Spherical 43.1426 9.9201 1.57791 94.981 26 Spherical -81.5520 14.9392 27 flat INF 2.0000 1.5168 64.199 28 flat INF 1.0000 Image INF
[0066] Table 2 shows a design value of the macro lens in Example 2, and its specific value can be adjusted according to product requirements and is not a limitation of the embodiment of the utility model. The macro lens shown in Table 2 can be Figure 6 as shown in .
[0067] In the second embodiment, when the object distance is infinite, the focal length of the macro lens is 98.49 mm. When the object distance is infinite, d1 is 46.9395 mm. When the object distance is infinite, d2 is 1 mm. The object distance can be as close as 82.547 mm. When the object distance is 82.547 mm, the focal length of the macro lens is 36.51 mm. When the object distance is 82.547 mm, d1 is 1.8471 mm. When the object distance is 82.547 mm, d2 is 46.0922 mm.
[0068] In the embodiment of the macro lens shown in Table 2, Φ2 / Φ=2.0591, Φ2 / Φ3=-1.1742, ZOL / f=0.4578, D1 / TTL=0.3008, ΦL3 / Φ=1.5562, ΦL14 / Φ=1.9591.
[0069] Embodiment 3
[0070] Table 3 A design value of the macro lens in Example 3
[0071] Surface number Face type Radius of curvature thickness Refractive Index Abbe number Object INF INF 1 Spherical 276.7687 1.2860 1.85323 16.912 2 Spherical 135.7438 5.4385 1.99397 17.145 3 Spherical 338.0379 D1 4 Spherical 95.2750 4.4389 1.79953 41.329 5 Spherical -149.4757 0.1416 6 Spherical 34.1716 4.2260 1.74929 47.738 7 Spherical 87.2547 2.4669 8 Spherical -126.3910 3.0646 2.0346 23.896 9 Spherical 34.6501 4.9335 1.46153 87.461 10 Spherical -201.6762 2.2165 11 Spherical 31.4934 4.3842 1.86137 18.266 12 Spherical -838.7375 0.1449 13 Spherical 83.9975 1.8440 2.0196 20.565 14 Spherical 23.5488 2.9444 15 Spherical 71.0142 4.6578 1.7127 47.006 16 Spherical -90.5831 0.9998 STP Aperture INF D2 18 Spherical 105.0106 1.1199 1.8682 45.721 19 Spherical 23.6366 3.9229 20 Spherical -178.7829 4.4013 1.98035 16.614 21 Spherical -18.8354 7.8679 1.76601 20.036 22 Spherical 1526.7106 7.2216 23 Spherical -21.2205 1.1322 1.58238 41.982 24 Spherical -131.5062 0.1025 25 Spherical 57.9285 7.2157 1.64718 94.98 26 Spherical -56.9925 19.5287 27 flat INF 2.0000 1.5168 64.199 28 flat INF 1.0000 Image INF
[0072] Table 3 shows a design value of the macro lens in Example 3, and its specific value can be adjusted according to product requirements and is not a limitation of the embodiments of the utility model. The macro lens shown in Table 3 can be Fig.11 as shown in .
[0073] In Example 3, when the object distance is infinity, the focal length of the macro lens is 97.92 mm. When the object distance is infinity, d1 is 44.2999 mm. When the object distance is infinity, d2 is 1 mm. The object distance can be as close as 82.547 mm. When the object distance is 35.682 mm, the focal length of the macro lens is 35.682 mm. When the object distance is 82.547 mm, d1 is 3.1548 mm. When the object distance is 82.547 mm, d2 is 42.1449 mm.
[0074] In the embodiment of the macro lens shown in Table 3, Φ2 / Φ=2.1009, Φ2 / Φ3=-1.1259, ZOL / f=0.4202, D1 / TTL=0.3194, ΦL3 / Φ=1.3350, ΦL14 / Φ=2.1520.
[0075] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A compact high-magnification macro lens, characterized in that: The lens comprises a first lens group with positive focal power, a second lens group with positive focal power, a stop and a third lens group with negative focal power, which are arranged in sequence from the object side to the image side along the optical axis; The first lens group includes a first lens and a second lens arranged in sequence; The second lens group includes a third lens with positive power, a fourth lens with positive power, a fifth lens with negative power, a sixth lens with positive power or negative power, a seventh lens with positive power or negative power, an eighth lens with negative power and a ninth lens with positive power, which are arranged in sequence; The third lens group includes a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens arranged in sequence; In the process of focusing from infinity to close distance, the second lens group moves along the optical axis toward the object side, and the first lens group and the third lens group are fixed.
2. The compact high-magnification macro lens according to claim 1, characterized in that: The first lens is cemented with the second lens, the fifth lens is cemented with the sixth lens, and the eleventh lens is cemented with the twelfth lens.
3. The compact high-magnification macro lens according to claim 1, characterized in that: The fourth lens, the tenth lens and the thirteenth lens are all meniscus lenses; And / or, the third lens and the fourteenth lens are both biconvex lenses.
4. The compact high-magnification macro lens according to claim 1, characterized in that: The material of the sixth lens L6 and the fourteenth lens L14 is ED dispersion glass.
5. The compact high-magnification macro lens according to claim 1, characterized in that: The focal power of the second lens group is Φ2, and the focal power of the macro lens is Φ, which satisfies: 1.9<Φ2 / Φ<2.
2.
6. The compact high-magnification macro lens according to claim 1, characterized in that: The focal power of the second lens group is Φ2, and the focal power of the third lens group is Φ3, satisfying: -1.3<Φ2 / Φ3<-1.
1.
7. The compact high-magnification macro lens according to claim 1, characterized in that: In the process of focusing from infinity to close distance, the movement amount of the second lens group is ZOL, and the focal length of the macro lens when the object distance is infinite is f, which satisfies: 0.40 <ZOL / f<0.48。 8. The compact high-magnification macro lens according to claim 1, characterized in that: The clear aperture of the first lens is D1, and the distance from the object side to the image plane of the first lens is TTL, which satisfies: 0.28 <D1 / TTL<0.34。 9. The compact high-magnification macro lens according to claim 1, characterized in that: The focal power of the third lens is ΦL3, the focal power of the fourteenth lens is ΦL14, and the focal power of the macro lens is Φ, which satisfies: 1.0<ΦL3 / Φ<1.6; 1.8<ΦL14 / Φ<2.
3.
10. The compact high-magnification macro lens according to claim 1, characterized in that: The device is composed of 14 lenses, wherein the 14 lenses are the first lens to the fourteenth lens; All 14 lenses are glass lenses.