CN115685512A - Zoom optical system with constant aperture and super-large zoom ratio and imaging method thereof - Google Patents
Zoom optical system with constant aperture and super-large zoom ratio and imaging method thereof Download PDFInfo
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- CN115685512A CN115685512A CN202211470456.5A CN202211470456A CN115685512A CN 115685512 A CN115685512 A CN 115685512A CN 202211470456 A CN202211470456 A CN 202211470456A CN 115685512 A CN115685512 A CN 115685512A
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- 238000003384 imaging method Methods 0.000 title claims abstract description 13
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- 239000000463 material Substances 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 239000005331 crown glasses (windows) Substances 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 7
- 238000012546 transfer Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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Abstract
The invention relates to a zoom optical system with constant aperture and super-large zoom ratio and an imaging method thereof, and the zoom optical system comprises a front fixing group, a zoom group, a compensation group, a diaphragm and a rear fixing group, wherein the front fixing group comprises a first cemented lens group formed by a positive crescent lens, a negative crescent lens and a biconvex lens in tight joint, and a second cemented lens group formed by a negative crescent lens and a positive crescent lens in tight joint; the zoom group comprises a third cemented lens group formed by tightly connecting a negative crescent lens, a biconcave lens and a positive crescent lens, and a fourth cemented lens group formed by tightly connecting a biconcave lens and a positive crescent lens; the compensation group comprises a biconvex lens, a positive crescent lens, a negative crescent lens and a fifth cemented lens group formed by tightly connecting the biconvex lens and the positive crescent lens; the rear fixing group comprises a sixth cemented lens group formed by tightly connecting a biconcave lens and a positive crescent lens, a negative crescent lens, a seventh cemented lens group formed by tightly connecting a biconvex lens and a negative crescent lens, and a biconvex lens. The zoom lens has the advantages of super large zoom ratio, high magnification, constant aperture, simple and compact appearance structure, high resolution, and clear and stable vertical and horizontal zooming.
Description
The technical field is as follows:
the invention relates to a zoom optical system with a constant aperture and an overlarge zoom ratio and an imaging method thereof.
The background art comprises the following steps:
with the expansion and deepening of the production practice activity field of people, the optical lens can search a target in a large range and can carry out large-magnification detailed observation on the target, and the concept of the zoom optical system is generated under the requirement. Today, the machining level is continuously improved, the precision of the machined cam can completely ensure the stability of an image plane, and therefore, the mechanical compensation is the most common zoom type.
The traditional mechanical compensation type zoom optical system is generally structured by sequentially forming a front fixed group, a zoom group, a compensation group and a rear fixed group. With the continuous decrease of the pixel size of the photoelectric sensor and the rapid increase of the nyquist frequency, the optical video monitoring has been developed from the previous simple restoration of external scenes to the present accurate discovery and identification, so that the zoom optical system is required to have not only the largest possible zoom ratio, but also high resolution, small distortion and high image restoration degree. The zoom ratio of the existing zoom optical system in the market is generally not high; the aperture is sometimes not constant with the increase of the zoom ratio, so that the optical machine structure is more complicated, which is undoubtedly an important influence factor for increasing the volume of the device, and further restricts the wide application of the zoom optical lens in various fields.
The invention content is as follows:
the present invention is directed to solving the above-mentioned problems in the prior art, and an object of the present invention is to provide a zoom optical system having a constant aperture and an ultra-large zoom ratio and an imaging method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: a zooming optical system with constant aperture and super-large zoom ratio comprises a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm and a rear fixed group D with positive focal power, which are sequentially arranged along the light incidence direction, wherein the front fixed group A comprises a positive crescent lens A-1, a first cemented lens group formed by a negative crescent lens A-2 and a double convex lens A-3 in tight joint, and a second cemented lens group formed by a negative crescent lens A-4 and a positive crescent lens A-5 in tight joint; the zoom group B comprises a negative crescent lens B-1, a third cemented lens group formed by tightly connecting a double concave lens B-2 and a positive crescent lens B-3, and a fourth cemented lens group formed by tightly connecting a double concave lens B-4 and a positive crescent lens B-5 which are sequentially arranged along the light incidence direction; the compensation group C comprises a biconvex lens C-1, a positive crescent lens C-2 and a fifth cemented lens group formed by a negative crescent lens C-3 and a biconvex lens C-4 which are sequentially arranged along the light incidence direction; the rear fixing group D comprises a sixth cemented lens group formed by a biconcave lens D-1 and a positive crescent lens D-2 which are closely connected, a negative crescent lens D-3, a seventh cemented lens group formed by a biconvex lens D-4 and a negative crescent lens D-5 which are closely connected and a biconvex lens D-6 which are sequentially arranged along the light incidence direction.
Further, the air space between the front fixed group A and the variable-magnification group B is 2.2-192.9 mm, the air space between the variable-magnification group B and the compensation group C is 3.1-234.1 mm, and the air space between the compensation group C and the rear fixed group D is 4.2-44.4 mm.
Further, the air space between the orthodontic lens A-1 and the first cemented lens group is 4.4 mm; the air interval between the first gluing lens group and the second gluing lens group is 0.1 mm; the air interval between the negative crescent lens B-1 and the third cemented lens group is 13.4 mm; the air interval between the third gluing lens group and the fourth gluing lens group is 4.5 mm; the air space between the biconvex lens C-1 and the orthodontic lens C-2 is 0.1 mm; the air space between the positive crescent lens C-2 and the fifth cemented lens group is 0.1 mm; the air space between the sixth cemented lens group and the negative crescent lens D-3 is 24.1 mm, and the air space between the negative crescent lens D-3 and the seventh cemented lens group is 20.4 mm; and the air space between the seventh cemented lens group and the biconvex lens D-6 is 0.1 mm.
Further, the ratio of the focal length fa of the front fixed group a to the focal length fb of the variable magnification group B satisfies: and | fa/fb | is less than or equal to 10 and less than or equal to 18, and the ratio of the focal length fb of the zooming group B to the focal length fc of the compensation group C satisfies the following conditions: | fb/fc | ≦ 0.52 ≦ 0.9, and the ratio of the focal length fc of the compensation group C to the focal length fd of the rear fixed group D satisfies: | fc/fd | is more than or equal to 0.95 and less than or equal to 1.7.
Further, the ratio of the focal length fa of the front fixed group a to the effective focal length fL at the telephoto position satisfies: and | fa/fL | is more than or equal to 0.35 and less than or equal to 0.6, and the ratio of the focal length fb of the zoom group B to the effective focal length fL of the tele position satisfies the following conditions: | fb/fL | is more than or equal to 0.02 and less than or equal to 0.06, and the ratio of the focal length fc of the compensation group C to the effective focal length fL of the telephoto position satisfies the following conditions: | fc/fL | < 0.03 ≦ 0.09, and the ratio of the focal length fd of the rear fixed group D to the effective focal length fL of the tele position satisfies: the absolute value of fd/fL is more than or equal to 0.02 and less than or equal to 0.06.
Furthermore, at least one lens in the front fixed group A is made of a fluorine crown glass material, and at least one lens in the variable power group B is made of a material with an Abbe coefficient smaller than 18.
Further, the ratio of the back focal length FL of the optical system to the effective focal length FL of the tele position satisfies: FL/fL is more than or equal to 0.02.
The invention adopts another technical scheme that: an imaging method of a zoom optical system with a constant aperture and an overlarge zoom ratio comprises the following steps: the light rays sequentially pass through a positive crescent lens A-1, a first gluing lens group formed by tightly connecting a negative crescent lens A-2 and a double convex lens A-3, a second gluing lens group formed by tightly connecting a negative crescent lens A-4 and a positive crescent lens A-5, a negative crescent lens B-1, a third gluing lens group formed by tightly connecting a double concave lens B-2 and a positive crescent lens B-3, a fourth gluing lens group formed by tightly connecting a double concave lens B-4 and a positive crescent lens B-5, a double convex lens C-1, a positive crescent lens C-2, a fifth gluing lens group formed by tightly connecting a negative crescent lens C-3 and a double convex lens C-4, a sixth gluing lens group formed by tightly connecting a double concave lens D-1 and a positive crescent lens D-2, a negative crescent lens D-3, a seventh gluing lens group formed by tightly connecting a double convex lens D-4 and a negative crescent lens D-5 and a lens D-6 from left to right to form images.
Compared with the prior art, the invention has the following effects: the invention has reasonable design, adopts twenty spherical lenses, has the maximum image surface of phi 8.8 mm, continuously changes the field angle of 0.84-49.4 degrees, has the total system length of 450 mm and the maximum distortion of less than 4 percent, has good imaging effect, has super large zoom ratio, high magnification, constant aperture, simple and compact appearance structure, high resolution and clear and stable length and breadth during zooming.
Description of the drawings:
FIG. 1 is a schematic view showing the configuration of an optical system in an embodiment of the present invention;
FIG. 2 is a modulation transfer function curve of the optical system at a short focus position at normal temperature in the embodiment of the present invention;
FIG. 3 is a modulation transfer function curve of the optical system at the middle focal position at normal temperature in the embodiment of the present invention;
FIG. 4 is a modulation transfer function curve of the optical system at the telephoto position at normal temperature in the embodiment of the present invention
FIG. 5 is a distortion curve of an optical system in an embodiment of the present invention;
FIG. 6 is a graph of relative illuminance of an optical system in an embodiment of the present invention.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in FIG. 1, the zoom optical system with constant aperture and super-large zoom ratio of the present invention comprises a front fixed group A with positive focal power, a zoom group B with negative focal power, a compensation group C with positive focal power, a diaphragm and a rear fixed group D with positive focal power, which are sequentially arranged along the incident direction of light from left to right, wherein the front fixed group A comprises a positive crescent lens A-1, a first cemented lens group formed by tightly connecting a negative crescent lens A-2 and a double convex lens A-3, and a second cemented lens group formed by tightly connecting a negative crescent lens A-4 and a positive crescent lens A-5; the variable power group B comprises a negative crescent lens B-1, a third cemented lens group formed by a biconcave lens B-2 and a positive crescent lens B-3 in a close joint manner, and a fourth cemented lens group formed by a biconcave lens B-4 and a positive crescent lens B-5 in a close joint manner, which are arranged in sequence along the incident direction of light rays from left to right; the compensation group C comprises a biconvex lens C-1, a positive crescent lens C-2 and a fifth cemented lens group formed by a negative crescent lens C-3 and a biconvex lens C-4 which are sequentially arranged along the incident direction of light rays from left to right; the rear fixing group D comprises a sixth cemented lens group formed by a biconcave lens D-1 and a positive crescent lens D-2 which are closely connected, a negative crescent lens D-3, a seventh cemented lens group formed by a biconvex lens D-4 and a negative crescent lens D-5 which are closely connected and a biconvex lens D-6 which are sequentially arranged along the incident direction of light rays from left to right. Twenty spherical lenses are adopted, the maximum image surface reaches phi 8.8 mm, the field angle is continuously changed from 0.84 to 49.4 degrees, the total length of the system is 450 mm, the maximum distortion is less than 4 percent, the imaging effect is good, and the imaging lens has the advantages of super-large zoom ratio, high magnification, constant aperture, simple and compact appearance structure, high resolution and clear and stable length and breadth during zooming.
In this embodiment, the air space between the front fixed group a and the zoom group B is 2.2-192.9 mm, the air space between the zoom group B and the compensation group C is 3.1-234.1 mm, and the air space between the compensation group C and the rear fixed group D is 4.2-44.4 mm.
In this embodiment, the air space between the orthodontic lens a-1 and the first cemented lens group is 4.4 mm; the air interval between the first cemented lens group and the second cemented lens group is 0.1 mm; the air interval between the negative crescent lens B-1 and the third cemented lens group is 13.4 mm; the air interval between the third gluing lens group and the fourth gluing lens group is 4.5 mm; the air space between the biconvex lens C-1 and the orthodontic lens C-2 is 0.1 mm; the air interval between the positive crescent lens C-2 and the fifth cemented lens group is 0.1 mm; the air interval between the sixth cemented lens group and the negative crescent lens D-3 is 24.1 mm, and the air interval between the negative crescent lens D-3 and the seventh cemented lens group is 20.4 mm; and the air space between the seventh cemented lens group and the biconvex lens D-6 is 0.1 mm.
In this embodiment, the 5 lenses in the front fixed group a are arranged in a positive-negative positive arrangement; at least one group of the variable power group B is a cemented lens group formed by tightly connecting a negative lens and a positive lens.
In this embodiment, the ratio of the focal length fa of the front fixed group a to the focal length fb of the zoom group B satisfies: and | fa/fb | is less than or equal to 10 and less than or equal to 18, and the ratio of the focal length fb of the zooming group B to the focal length fc of the compensation group C satisfies the following conditions: | fb/fc | ≦ 0.52 ≦ 0.9, and the ratio of the focal length fc of the compensation group C to the focal length fd of the rear fixed group D satisfies: | fc/fd | is more than or equal to 0.95 and less than or equal to 1.7.
In this embodiment, the ratio of the focal length fa of the front fixed group a to the effective focal length fL of the telephoto position satisfies: and | fa/fL | is more than or equal to 0.35 and less than or equal to 0.6, and the ratio of the focal length fb of the zoom group B to the effective focal length fL of the tele position satisfies the following conditions: | fb/fL | is more than or equal to 0.02 and less than or equal to 0.06, and the ratio of the focal length fc of the compensation group C to the effective focal length fL of the telephoto position satisfies the following conditions: | fc/fL | is more than or equal to 0.03 and less than or equal to 0.09, and the ratio of the focal length fd of the rear fixed group D to the effective focal length fL of the tele position satisfies: the | fd/fL | is more than or equal to 0.02 and less than or equal to 0.06.
In this embodiment, at least one lens of the front fixed group a is made of a fluoro crown material.
In this embodiment, at least one lens in the variable power group B is made of a material having an abbe number smaller than 18.
In this embodiment, the ratio of the back focal length FL of the optical system to the effective focal length FL of the telephoto position satisfies: FL/fL is more than or equal to 0.02.
In the embodiment, the maximum image surface matched by the optical system is phi 8.8 mm, the field angle is continuously changed from 0.84 degrees to 49.4 degrees, and the maximum distortion is less than 4 percent.
In this embodiment, the aperture of the optical system is constant during zooming, and is maintained at 5.5 from short focus to long focus.
In this embodiment, the thickness of the positive crescent lens A-1 is 16.4 mm, the thickness of the negative crescent lens A-2 is 6.0 mm, the thickness of the biconvex lens A-3 is 26.0 mm, the thickness of the negative crescent lens A-4 is 4.0 mm, and the thickness of the positive crescent lens A-5 is 21.2 mm; the thickness of the negative crescent lens B-1 is 2.5 mm, the thickness of the double concave lens B-2 is 2.0 mm, the thickness of the positive crescent lens B-3 is 12.4 mm, the thickness of the double concave lens B-4 is 1.5 mm, and the thickness of the positive crescent lens B-5 is 5.3 mm; the thickness of the biconvex lens C-1 is 3.1 mm, the thickness of the positive crescent lens C-2 is 2.7 mm, the thickness of the negative crescent lens C-3 is 1.0 mm, and the thickness of the biconvex lens C-4 is 4.8 mm; the thickness of the biconcave lens D-1 is 1.0 mm, the thickness of the positive crescent lens D-2 is 2.6 mm, the thickness of the negative crescent lens D-3 is 1.0 mm, the thickness of the biconvex lens D-4 is 4.3 mm, the thickness of the negative crescent lens D-5 is 1.0 mm, and the thickness of the biconvex lens D-6 is 3.6 mm.
In this embodiment, when the optical system performs imaging: the light rays sequentially pass through a positive crescent lens A-1, a first gluing lens group formed by tightly connecting a negative crescent lens A-2 and a double convex lens A-3, a second gluing lens group formed by tightly connecting a negative crescent lens A-4 and a positive crescent lens A-5, a negative crescent lens B-1, a third gluing lens group formed by tightly connecting a double concave lens B-2 and a positive crescent lens B-3, a fourth gluing lens group formed by tightly connecting a double concave lens B-4 and a positive crescent lens B-5, a double convex lens C-1, a positive crescent lens C-2, a fifth gluing lens group formed by tightly connecting a negative crescent lens C-3 and a double convex lens C-4, a sixth gluing lens group formed by tightly connecting a double concave lens D-1 and a positive crescent lens D-2, a negative crescent lens D-3, a seventh gluing lens group formed by tightly connecting a double convex lens D-4 and a negative crescent lens D-5 and a lens D-6 from left to right to form images.
In this embodiment, specific parameters of each lens in the optical system are shown in table 1 below:
TABLE 1
In this embodiment, by using the lens, the technical indexes of the optical system are as follows:
1. maximum image plane: 8.82mm;
2. wavelength range: visible light;
3. focal length: 10-780mm;
4. angle of view: 0.84-49.4 degrees;
5. diameter of the diaphragm: 8mm;
6. maximum distortion: less than 4%;
8. rear intercept: 20 mm.
In this embodiment, in the optical system, as shown in fig. 2, the modulation transfer function value of the on-axis field at 90lp/mm is greater than 0.5 at the short-focus position, and the modulation transfer functions of the off-axis field at this frequency are also both greater than 0.2; as shown in fig. 3, the modulation transfer function value of the on-axis field at 90lp/mm is close to 0.6 at the middle focus position, and the modulation transfer functions of the off-axis field at the frequency are both greater than 0.3; as shown in FIG. 4, the modulation transfer function value of 90lp/mm of the on-axis field of view at the long-focus position reaches 0.6, and the modulation transfer functions of the off-axis field of view at the frequency are all larger than 0.4, so that the visible imaging quality is very good. As shown in fig. 6, the relative illumination of the optical system at the fringe field of view is greater than 70%.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding) can, of course, also be replaced by one-piece structures (e.g. manufactured in one piece using a casting process) (unless it is obvious that one-piece processes cannot be used).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications of the embodiments of the invention or equivalent substitutions for parts of the technical features are possible; without departing from the spirit of the invention, it is intended to cover all modifications within the scope of the invention as claimed.
Claims (8)
1. A zoom optical system with a constant aperture and an ultra-large zoom ratio is characterized in that: the optical-power-adjustable front fixing device comprises a front fixing group A with positive optical power, a zoom group B with negative optical power, a compensation group C with positive optical power, a diaphragm and a rear fixing group D with positive optical power which are sequentially arranged along the light incidence direction, wherein the front fixing group A comprises a positive crescent lens A-1, a first cemented lens group formed by tightly connecting a negative crescent lens A-2 and a double convex lens A-3 and a second cemented lens group formed by tightly connecting a negative crescent lens A-4 and a positive crescent lens A-5 which are sequentially arranged along the light incidence direction; the zoom group B comprises a negative crescent lens B-1, a third cemented lens group formed by tightly connecting a double concave lens B-2 and a positive crescent lens B-3, and a fourth cemented lens group formed by tightly connecting a double concave lens B-4 and a positive crescent lens B-5 which are sequentially arranged along the light incidence direction; the compensation group C comprises a biconvex lens C-1, a positive crescent lens C-2 and a fifth cemented lens group which is formed by tightly connecting a negative crescent lens C-3 and a biconvex lens C-4 which are sequentially arranged along the incident direction of light rays; the rear fixing group D comprises a sixth cemented lens group formed by a biconcave lens D-1 and a positive crescent lens D-2 which are closely connected, a negative crescent lens D-3, a seventh cemented lens group formed by a biconvex lens D-4 and a negative crescent lens D-5 which are closely connected and a biconvex lens D-6 which are sequentially arranged along the light incidence direction.
2. The zoom optical system of claim 1, wherein the zoom optical system comprises: the air space between the front fixed group A and the zooming group B is 2.2-192.9 mm, the air space between the zooming group B and the compensation group C is 3.1-234.1 mm, and the air space between the compensation group C and the rear fixed group D is 4.2-44.4 mm.
3. The zoom optical system of claim 1, wherein the zoom optical system comprises: the air space between the orthodontic lens A-1 and the first cemented lens group is 4.4 mm; the air interval between the first gluing lens group and the second gluing lens group is 0.1 mm; the air interval between the negative crescent lens B-1 and the third cemented lens group is 13.4 mm; the air space between the third cemented lens group and the fourth cemented lens group is 4.5 mm; the air space between the biconvex lens C-1 and the orthodontic lens C-2 is 0.1 mm; the air space between the positive crescent lens C-2 and the fifth cemented lens group is 0.1 mm; the air interval between the sixth cemented lens group and the negative crescent lens D-3 is 24.1 mm, and the air interval between the negative crescent lens D-3 and the seventh cemented lens group is 20.4 mm; and the air space between the seventh cemented lens group and the biconvex lens D-6 is 0.1 mm.
4. The zoom optical system of claim 1, wherein the zoom optical system comprises: the ratio of the focal length fa of the front fixed group A to the focal length fb of the zoom group B satisfies: the absolute value fa/fb is more than or equal to 10 and less than or equal to 18, and the ratio of the focal length fb of the zooming group B to the focal length fc of the compensation group C meets the following conditions: | fb/fc | ≦ 0.52 ≦ 0.9, and the ratio of the focal length fc of the compensation group C to the focal length fd of the rear fixed group D satisfies: | fc/fd | is more than or equal to 0.95 and less than or equal to 1.7.
5. The zoom optical system of claim 1, wherein the zoom optical system comprises: the ratio of the focal length fa of the front fixed group A to the effective focal length fL of the telephoto position satisfies: and | fa/fL | is more than or equal to 0.35 and less than or equal to 0.6, and the ratio of the focal length fb of the zoom group B to the effective focal length fL of the tele position satisfies the following conditions: | fb/fL | is more than or equal to 0.02 and less than or equal to 0.06, and the ratio of the focal length fc of the compensation group C to the effective focal length fL of the tele position satisfies the following conditions: | fc/fL | < 0.03 ≦ 0.09, and the ratio of the focal length fd of the rear fixed group D to the effective focal length fL of the tele position satisfies: the absolute value of fd/fL is more than or equal to 0.02 and less than or equal to 0.06.
6. The zoom optical system of claim 1, wherein the zoom optical system comprises: at least one lens in the front fixed group A is made of a fluorine crown glass material, and at least one lens in the zoom group B is made of a material with an Abbe coefficient smaller than 18.
7. The zoom optical system of claim 1, wherein the zoom optical system comprises: the ratio of the back intercept FL of the optical system to the effective focal length fL of the tele position satisfies: FL/fL is more than or equal to 0.02.
8. An imaging method of a zoom optical system with a constant aperture and an ultra-large zoom ratio is characterized in that: the zoom optical system with the constant aperture and the super-large zoom ratio as set forth in any one of claims 1 to 7 is adopted, and when imaging: the light rays sequentially pass through a positive crescent lens A-1, a first cemented lens group formed by a negative crescent lens A-2 and a biconvex lens A-3 in a sealing manner, a second cemented lens group formed by a negative crescent lens A-4 and a positive crescent lens A-5 in a sealing manner, a negative crescent lens B-1, a third cemented lens group formed by a biconcave lens B-2 and a positive crescent lens B-3 in a sealing manner, a fourth cemented lens group formed by a biconcave lens B-4 and a positive crescent lens B-5 in a sealing manner, a biconvex lens C-1, a positive crescent lens C-2, a fifth cemented lens group formed by a negative crescent lens C-3 and a biconvex lens C-4 in a sealing manner, a sixth cemented lens group formed by a biconcave lens D-1 and a positive crescent lens D-2 in a sealing manner, a negative biconvex lens D-3, a seventh cemented lens group formed by a negative biconvex lens D-4 and a negative biconvex lens D-5 in a sealing manner, and a lens D-6 from left to right to form an image.
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| CN113514941A (en) * | 2021-03-22 | 2021-10-19 | 福建福光股份有限公司 | Long-focus visible light continuous zoom lens |
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| EP2413178A1 (en) * | 2010-07-29 | 2012-02-01 | Fujifilm Corporation | Zoom lens and imaging apparatus |
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