CN110361855B - Telephoto microspur exchangeable fixed focus lens - Google Patents
Telephoto microspur exchangeable fixed focus lens Download PDFInfo
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- CN110361855B CN110361855B CN201910764596.5A CN201910764596A CN110361855B CN 110361855 B CN110361855 B CN 110361855B CN 201910764596 A CN201910764596 A CN 201910764596A CN 110361855 B CN110361855 B CN 110361855B
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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Abstract
A telephoto macro exchangeable fixed focus lens comprising: the image capture device comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are arranged from the object side to the image side in sequence, wherein: the first lens group and the fourth lens group are fixedly arranged, and the second lens group and the third lens group are in floating focusing arrangement; the first lens group includes: a first negative focal power lens, a second negative focal power cemented lens and a third positive focal power lens; the second lens group includes: a fourth negative focal power cemented lens and a fifth negative focal power lens; the third lens group includes: a sixth positive focal power lens, a seventh positive focal power cemented lens and an eighth positive focal power lens; the fourth lens group includes: a ninth negative power lens and a tenth positive power cemented lens. The invention adopts a double-group floating focusing mode, the front group and the rear group are fixedly arranged, the middle two groups move to carry out floating focusing, the ratio of the moving amount of the second lens group to the moving amount of the third lens group is particularly optimized, and the respiratory effect is effectively weakened.
Description
Technical Field
The invention relates to a technology in the field of photographic lenses, in particular to a telephoto microspur exchangeable fixed focus lens.
Background
The film lens not only has the top-level optical quality, but also the mechanical structure thereof is designed to fully take the professional requirements of film production into consideration. However, the design difficulty and the manufacturing difficulty of the movie lens are high, and the field of the movie lens in China is still blank, but the common camera lens cannot meet the requirements of video and movie shooting, and the defects exist: 1. the resolution is insufficient: 2. has obvious dark corners: 3. distortion is large; 4. the respiratory effect is obvious; 5. the aperture is not large enough.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a telephoto macro exchangeable fixed focus lens, which adopts a double-group floating focusing mode, when a shot object changes from infinity to close distance, a front group and a rear group are fixedly arranged, the middle two groups move to carry out floating focusing, the ratio of the moving amount of a second lens group to the moving amount of a third lens group is particularly optimized, and the respiratory effect is effectively weakened.
The invention is realized by the following technical scheme:
the invention comprises the following steps: the first lens group, the second lens group, the diaphragm, the third lens group and the fourth lens group are arranged in sequence from the object side to the image side, wherein: the first lens group and the fourth lens group are fixedly arranged, and the second lens group and the third lens group are arranged in a floating focusing mode.
The first lens group comprises: the lens comprises a first negative focal power lens, a second negative focal power cemented lens and a third positive focal power lens.
The second lens group comprises: a fourth negative focal power cemented lens and a fifth negative focal power lens.
The third lens group comprises: a sixth positive focal power lens, a seventh positive focal power cemented lens and an eighth positive focal power lens.
The fourth lens group includes: a ninth negative power lens and a tenth positive power cemented lens.
The fourth lens group includes at least one aspherical lens.
The ratio of the moving amount of the second lens group to the moving amount of the third lens group is (0.8, 1.2).
The ratio of the integral focal length to the optical back focus is (2, 3).
The ratio of the focal length of the first lens group to the overall focal length is (0.25, 0.75).
The Abbe number of the second negative power cemented lens ranges from (86, 96).
Technical effects
Compared with the prior art, the invention has the technical effects that:
1. matching the 8k resolution of the full picture and the super35 picture, no obvious dark corner, small distortion, weak respiration effect, low cost and high cost performance;
2. the glass aspheric lens is added, so that the image resolving power and the resolution are remarkably improved, and the use of a professional-grade 8K resolution camera is met;
3. the peripheral brightness ratio is improved, and even when the aperture is fully opened, the peripheral brightness ratio is over 35 percent, so that light passing through the whole lens is more uniform on a picture, and accurate exposure during film shooting is facilitated;
4. the structure and the light path of the lens are optimized, the symmetry of a rear end group of the lens is enhanced, the TV distortion is below 1%, and the picture is ensured not to be deformed and distorted from the center to the most periphery;
5. and a double-group floating focusing mode is adopted, the first lens group and the fourth lens group are fixedly arranged, the second lens group moves from the object side to the image side, and the third lens group moves from the image side to the object side to perform double-group floating focusing.
Drawings
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is an image parameter chart of embodiment 1 of the present invention;
FIG. 3 is an image parameter chart of embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of embodiment 2 of the present invention;
FIG. 5 is an image parameter chart of embodiment 2 of the present invention;
FIG. 6 is an image parameter chart of embodiment 2 of the present invention;
in the figure: the lens comprises a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a first negative power lens L1, a second negative power cemented lens L2, a third positive power lens L3, a fourth negative power cemented lens L4, a fifth negative power lens L5, a sixth positive power lens L6, a seventh positive power cemented lens L7, an eighth positive power lens L8, a ninth negative power lens L9, a tenth positive power cemented lens L10 and a diaphragm STP.
Detailed Description
Example 1
As shown in fig. 1, the telephoto and macro interchangeable fixed focus lens according to the present embodiment includes: a first lens group G1, a second lens group G2, a stop STP, a third lens group G3, and a fourth lens group G4, arranged in order from the object side to the image side, wherein: the first lens group G1 and the fourth lens group G4 are fixedly disposed, and the second lens group G2 and the third lens group G3 are arranged in a floating focus manner.
The first lens group G1 includes: a first negative power lens L1, a second negative power cemented lens L2, and a third positive power lens L3.
The second lens group G2 includes: a fourth negative power cemented lens L4 and a fifth negative power lens L5.
The third lens group G3 includes: a sixth positive power lens L6, a seventh positive power cemented lens L7, and an eighth positive power lens L8.
The diaphragm STP is arranged between the fifth negative power lens L5 and the sixth positive power lens L6.
The fourth lens group G4 includes: a ninth negative power lens L9 and a tenth positive power cemented lens L10.
The fourth lens group G4 includes at least one aspheric lens, and if no aspheric lens is used, the resolving power of the lens cannot be significantly improved, and thus the lens cannot be used by a camera with 6k or 8k resolution, and the volume and weight of the lens are reduced, thereby achieving miniaturization.
The ratio of the moving amount of the second lens group G2 to the moving amount of the third lens group G3 satisfies the following condition:
(1)0.8< | S1/S2| <1.2, wherein: s1 is the movement amount of the second lens group G2, and S2 is the movement amount of the third lens group G3, so that the change in the angle of view of the lens is small during the change of the lens object distance from infinity to close distance. When the lower limit of the conditional expression is lower than the lower limit of the conditional expression, the movement amount of the third lens group G2 is too large, so that the overall outer diameter is increased, the cost is greatly increased, and the optimization of the magnification chromatic aberration of the lens is not facilitated, so that the resolution is reduced, and the use requirement of the 8k camera cannot be met; if the distance is higher than the upper limit of the conditional expression, the angle of view of the lens is changed too much in the process of changing the object distance of the lens from infinity to a close distance, so that the respiration effect is obvious, and the shooting and use of the movie are not facilitated.
The whole focal length and the back focal length of the lens meet the following requirements:
(2)2< EFL/BFL <3, wherein: EFL is the whole focal length of this camera lens, BFL is the optics back focal of this camera lens, makes the ratio of focal length and the back focal of camera lens in a suitable range. When the value is lower than the upper limit of the conditional expression, the back focal length of the lens is too long, so that the fourth lens group G4 needs to have higher focal power to adjust the spherical aberration, the peripheral coma aberration and the variation of chromatic aberration caused by focusing, and the optical performance is rapidly deteriorated and cannot reach the resolution of 8 k; if the upper limit of the conditional expression is exceeded, the back focus of the lens is too short, so that the lens is not suitable for a film camera on the market, and the practicability is deteriorated.
The focal length of the first lens group G1 and the overall focal length of the lens meet the following requirements:
(3)0.25<FG1/F<0.75, wherein: fG1When the focal length of the first lens group G1 of the lens is less than the lower limit of the conditional expression, the focal power of the first lens group G1 of the lens is distributed too much, and further the focal powers of the second lens group G2 and the third lens group G3 are too low, so that the lens diameters of the second lens group G2 and the third lens group G3 are increased, the overall weight is increased, and the focusing process of the lens due to the change of the object distance is not facilitated; if the optical power is higher than the upper limit of the conditional expression, the focal power of the first lens group G1 of the lens is too weak, so that the entire aperture of the lens is too large, which is not favorable for miniaturization of the lens, and is also not favorable for assembly of the lens and adjustment of the entire weight and center of gravity, and it is also difficult to correct the change of spherical aberration, peripheral chromatic aberration, and coma caused by focusing.
The second negative-power cemented lens L2 satisfies the following conditions:
(4)86<VDL2<96, wherein: vDL2The abbe number of the front lens L2 of the second negative power cemented lens L2 is lower than the lower limit, and the abbe number of the front lens L2 of the second negative power cemented lens is too low to correct axial chromatic aberration and chromatic aberration of magnification of the lens, and meanwhile, spherical aberration formed by the first lens group G1 is difficult to compensate; if the value is higher than the upper limit, the spherical aberration formed by the first lens group G1 is corrected too much, resulting in a reduction in lens performance and a too high lens price.
As shown in fig. 2 and 3, in example 1, EFL is 100.0, TNO is 2.2(TNO is an aperture value after calculating a transmittance of a lens), and table 1 shows structural parameters of each lens.
TABLE 1
TABLE 2
| POS1 | POS2 | |
| D0 | INF | 136 |
| D1 | 2.85 | 19.25 |
| D2 | 21.32 | 4.92 |
| D3 | 22.86 | 3.05 |
| D4 | 1.81 | 21.62 |
| FOV | 12.26 | 11.96 |
| Magnification ratio | / | 1X |
The process of changing from POS1 to POS2, i.e., the process of changing object distance from infinity to the closest photographic distance, wherein: the FOV is the angle of view of the lens, and when the FOV changes from POS1 to POS2, the FOV changes by 2.5%, and the respiratory effect is weak.
The aspheric coefficients of the ninth negative power lens L9 are shown in table 3:
TABLE 3
| S20 | S21 | ||
| K | 0 | K | 0 |
| A(4th) | -1.74E-05 | A(4th) | 7.56E-05 |
| B(6th) | 8.17E-06 | B(6th) | -3.15E-06 |
| C(8th) | 2.58E-08 | C(8th) | -7.45E-07 |
| D(10th) | 5.24E-08 | D(10th) | 8.16E-12 |
Wherein: k is the conic coefficient and e is the scientific number, e.g. e-005 means 10-5。
Example 2
As shown in fig. 4 and 5, the only difference of this embodiment compared to embodiment 1 is that: EFL is 101.0, TNO is 2.0(TNO is an aperture value after the lens transmittance is calculated), and table 4 shows the structural parameters of each lens in this example.
TABLE 4
TABLE 5
The process of changing from POS1 to POS2, i.e., the process of changing the object distance from infinity to the closest shooting distance; the FOV is the angle of view of the lens, and when the FOV changes from POS1 to POS2, the FOV changes by 2.6%, and the respiratory effect is weak.
The aspherical surface coefficients of the ninth negative power lens L9 are shown in table 6.
TABLE 6
| S20 | S21 | ||
| K | 0 | K | 0 |
| A(4th) | 3.17E-05 | A(4th) | 5.82E-06 |
| B(6th) | -6.35E-07 | B(6th) | -8.24E-07 |
| C(8th) | 1.36E-10 | C(8th) | -2.47E-08 |
| D(10th) | -5.28E-09 | D(10th) | -6.13E-09 |
Wherein: k is the conic coefficient and e is the scientific number, e.g. e-005 means 10-5。
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. A telephoto macro exchangeable fixed focus lens, comprising: the image capture device comprises a first lens group, a second lens group, a third lens group and a fourth lens group which are arranged from the object side to the image side in sequence, wherein: the first lens group and the fourth lens group are fixedly arranged, and the second lens group and the third lens group are in floating focusing arrangement;
the first lens group comprises: a first negative focal power lens, a second negative focal power cemented lens and a third positive focal power lens;
the second lens group comprises: a fourth negative focal power cemented lens and a fifth negative focal power lens;
the third lens group comprises: a sixth positive focal power lens, a seventh positive focal power cemented lens and an eighth positive focal power lens;
the fourth lens group comprises: a ninth negative power lens and a tenth positive power cemented lens, the fourth lens group comprising at least one aspheric lens;
the ratio of the moving amount of the second lens group to the moving amount of the third lens group satisfies: 0.8< | S1/S2| <1.2, wherein: s1 is the moving amount of the second lens group G2, and S2 is the moving amount of the third lens group G3;
the ratio of the integral focal length to the optical back focal length of the telephoto microspur exchangeable fixed-focus lens meets the following requirements: 2< EFL/BFL <3, wherein: EFL is the overall focal length of the lens, BFL is the optical back focus of the lens,
the ratio of the focal length of the first lens group to the integral focal length of the lens meets the following requirements: 0.25<FG1/F<0.75, wherein: fG1The focal length of the first lens group G1 of the lens, F is the overall focal length of the lens,
the abbe number of the front lens of the second negative focal power cemented lens meets the following requirements: 86<VDL2<96。
2. The telephoto macro interchangeable prime lens according to claim 1, wherein the ratio of the moving amounts of the second lens group and the third lens group is (0.8, 1.2).
3. The telephoto macro interchangeable prime lens according to claim 1, wherein the ratio of the overall focal length to the optical back focus of the lens is (2, 3).
4. The telephoto macro interchangeable prime lens according to claim 1, wherein the ratio of the focal length of the first lens group to the overall focal length of the lens is (0.25, 0.75).
5. The telephoto macro interchangeable prime lens according to claim 1, wherein the abbe number of the second negative power cemented lens is in the range of (86, 96).
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| EP2725406A2 (en) * | 2012-10-25 | 2014-04-30 | Ricoh Imaging Company, Ltd. | Zoom lens system |
| CN104024912A (en) * | 2011-11-04 | 2014-09-03 | 富士胶片株式会社 | Zoom lens and imaging device |
| JP2015001550A (en) * | 2013-06-13 | 2015-01-05 | オリンパスイメージング株式会社 | Zoom lens and imaging apparatus including the same |
| JP2016051137A (en) * | 2014-09-02 | 2016-04-11 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN209117962U (en) * | 2018-12-17 | 2019-07-16 | 东莞市宇瞳光学科技股份有限公司 | A kind of zoom lens and video camera |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4817699B2 (en) * | 2005-04-01 | 2011-11-16 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP2007219316A (en) * | 2006-02-17 | 2007-08-30 | Nikon Corp | Zoom lens and optical equipment equipped with the same |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104024912A (en) * | 2011-11-04 | 2014-09-03 | 富士胶片株式会社 | Zoom lens and imaging device |
| EP2725406A2 (en) * | 2012-10-25 | 2014-04-30 | Ricoh Imaging Company, Ltd. | Zoom lens system |
| JP2015001550A (en) * | 2013-06-13 | 2015-01-05 | オリンパスイメージング株式会社 | Zoom lens and imaging apparatus including the same |
| JP2016051137A (en) * | 2014-09-02 | 2016-04-11 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN209117962U (en) * | 2018-12-17 | 2019-07-16 | 东莞市宇瞳光学科技股份有限公司 | A kind of zoom lens and video camera |
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