CN113885184A - Long-focus zoom lens and image pickup device - Google Patents
Long-focus zoom lens and image pickup device Download PDFInfo
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- CN113885184A CN113885184A CN202111169310.2A CN202111169310A CN113885184A CN 113885184 A CN113885184 A CN 113885184A CN 202111169310 A CN202111169310 A CN 202111169310A CN 113885184 A CN113885184 A CN 113885184A
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B15/145—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 having five groups only
- G02B15/1451—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 having five groups only the first group being positive
- G02B15/145113—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 having five groups only the first group being positive arranged +-++-
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- G—PHYSICS
- G02—OPTICS
- 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
- G02B15/145—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 having five groups only
- G02B15/1451—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 having five groups only the first group being positive
- G02B15/145129—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 having five groups only the first group being positive arranged +-+++
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- G—PHYSICS
- G02—OPTICS
- 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
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Abstract
The invention discloses a long-focus zoom lens and an image pickup device, and relates to the technical field of optics. The long-focus zoom lens consists of five lens groups, and the long-focus zoom lens sequentially comprises the following components from the object plane side to the image plane side: the zoom lens group and the focusing lens group move along the optical axis direction of the long-focus zoom lens; the first fixed lens group consists of a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power in sequence from the object plane side to the image plane side, wherein the first lens is cemented with the second lens, and the fourth lens is cemented with the fifth lens. The miniaturization of the long-focus zoom lens is realized, and the cost of the long-focus zoom lens is greatly reduced.
Description
Technical Field
The present invention relates to the field of optical technologies, and in particular, to a long-focus zoom lens and an image pickup apparatus.
Background
In the field of photography and security lenses, the wide-angle end of an optical lens is generally used for restoring the effect of human eyes for obtaining the visual field, and the telephoto end of the optical lens is often the visual experience which cannot be directly touched by human eyes, so that the extension of the focal length of the telephoto end is always the research direction of lens companies.
In the field of photographic lenses, companies such as Canon and Fuji have introduced their own lenses with focal length of 100-.
In the field of security lenses, the conventional super-telephoto lenses are still large zoom lenses, and in order to consider the image quality at the wide-angle end and ensure the focal length covering the telephoto end, the image quality at the telephoto end is limited to a certain extent at a limited cost.
Disclosure of Invention
The invention solves the technical problems in the prior art, and provides a long-focus zoom lens and an image pickup device, so that the miniaturization of the long-focus zoom lens is realized, and the cost of the long-focus zoom lens is greatly reduced.
The technical scheme provided by the invention is as follows:
a long focus zoom lens composed of five lens groups, comprising in order from an object plane side to an image plane side: the zoom lens group and the focusing lens group move along the optical axis direction of the long-focus zoom lens; the first fixed lens group consists of a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power in sequence from the object plane side to the image plane side, wherein the first lens is cemented with the second lens, and the fourth lens is cemented with the fifth lens; the zoom lens group consists of a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with negative focal power in sequence from the object plane side to the image plane side, wherein the seventh lens and the eighth lens are cemented; the second fixed lens group, the focusing lens group and the adjusting lens group are all composed of two lenses.
Preferably, the second fixed lens group is composed of a tenth lens with positive focal power and an eleventh lens with negative focal power in sequence from the object plane side to the image plane side; the focusing lens group consists of a twelfth lens with negative focal power and a thirteenth lens with positive focal power in sequence from the object plane side to the image plane side, and the twelfth lens and the thirteenth lens are cemented; the adjusting lens group is composed of a fourteenth lens with negative focal power and a fifteenth lens with positive focal power in sequence from the object surface side to the image surface side, and the fourteenth lens and the fifteenth lens are cemented.
Preferably, the telephoto zoom lens satisfies the following conditional expression: fw is more than 90 mm; TTL is less than 170 mm; wherein fw is the focal length of the long-focus zoom lens in the wide-angle state, and TTL is the total optical length of the long-focus zoom lens.
Preferably, the telephoto zoom lens satisfies the following conditional expression: D56/TTL is more than 0.2; wherein D56 is the spacing between the fifth lens and the sixth lens.
Preferably, the telephoto zoom lens satisfies the following conditional expression: -3.5< fG4/fG2< -2; wherein fG2 is the focal length of the zoom lens group, and fG4 is the focal length of the focusing lens group.
Preferably, the telephoto zoom lens satisfies the following conditional expression: 1< | ffw/fbw | < 4; 1< | fft/fbt | < 9; wherein ffw is the focal length of the first fixed lens group and the zoom lens group in the wide-angle state, fbw is the focal length of the second fixed lens group, the focus lens group and the adjustment lens group in the wide-angle state, fft is the focal length of the first fixed lens group and the zoom lens group in the telephoto state, and fbt is the focal length of the second fixed lens group, the focus lens group and the adjustment lens group in the telephoto state.
Preferably, the tenth lens is an aspherical lens.
Preferably, the telephoto zoom lens satisfies the following conditional expression: phi L10/DL10 is more than 1.4; where Φ L10 is an effective aperture of the tenth lens, and DL10 is an optical total length of the tenth lens.
Preferably, the adjusting lens group satisfies the following conditional expression: l (R141-R152)/(R141+ R152) | < 0.1; where R141 is a radius of curvature of the curved surface of the fourteenth lens element facing the object plane side, and R152 is a radius of curvature of the curved surface of the fifteenth lens element facing the image plane side.
It is also an object of the present invention to provide an image pickup apparatus comprising: the telephoto zoom lens as claimed in any one of claims 1 to 9; and an image pickup element configured to receive an image formed by the telephoto zoom lens.
Compared with the prior art, the long-focus zoom lens and the image pickup device provided by the invention have the following beneficial effects:
1. the long focal length of the long focal length zoom lens can be realized through the second fixed lens group, the focusing lens group and the arrangement of a small number of lenses in the adjusting lens group, the imaging quality of the long focal length zoom lens is guaranteed to a certain degree, the miniaturization of the long focal length zoom lens is facilitated, and the cost of the long focal length zoom lens is greatly reduced.
2. By increasing the distance between the fifth lens and the sixth lens, namely, the distance between the first fixed lens group and the zoom lens group in a wide-angle state is increased, the moving distance of the zoom lens group is reduced, the focus lens group can better focus the long-focus zoom lens in a telescopic state in the focusing process, and then the imaging quality of the zoom lens in the telescopic state is increased.
3. Through the limitation of the focal lengths of the zoom lens group and the focusing lens group, the possibility of overlarge change of a focusing curve is reduced, the possibility of insufficient focal power is also reduced, and the imaging reliability of the long-focal-length zoom lens is improved.
Drawings
The above features, technical features, advantages and implementations of a telephoto zoom lens and an image pickup apparatus will be further described in the following detailed description of preferred embodiments with reference to the accompanying drawings.
FIG. 1 is a schematic view of a zoom lens with a long focal length in a wide angle state according to the present invention;
FIG. 2 is a schematic structural diagram of a telephoto state of the zoom lens according to the present invention;
FIG. 3 is an aberration diagram of a wide-angle state of a telephoto zoom lens according to the present invention;
FIG. 4 is an aberration diagram of the telephoto end state of the zoom lens system of the present invention;
FIG. 5 is a schematic view of the structure of the wide angle state of another telephoto zoom lens according to the present invention;
FIG. 6 is a schematic view of another telephoto configuration of the telephoto lens system according to the present invention;
FIG. 7 is an aberration diagram of a wide-angle state of another telephoto zoom lens according to the invention;
FIG. 8 is an aberration diagram of another telephoto lens system according to the invention.
The reference numbers illustrate: g1, a first fixed lens group; g2, zoom lens group; g3, a second fixed lens group; g4, a focusing lens group; g5, adjusting the lens group; STO, stop; l1, first lens; l2, second lens; l3, third lens; l4, fourth lens; l5, fifth lens; l6, sixth lens; l7, seventh lens; l8, eighth lens; l9, ninth lens; l10, tenth lens; l11, eleventh lens; l12, twelfth lens; l13, thirteenth lens; l14, fourteenth lens; l15, fifteenth lens; FI. An optical filter; CG. And (4) protecting the glass.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, only the parts relevant to the invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
In a first embodiment, as shown in fig. 1 and 2, a telephoto zoom lens comprising five lens groups includes, in order from an object plane side to an image plane side:
a first fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, a diaphragm STO, a second fixed lens group G3 with positive focal power, a focusing lens group G4 with positive focal power and an adjusting lens group G5, wherein the zoom lens group G2 and the focusing lens group G4 move along the optical axis direction of the long-focus zoom lens.
The first fixed lens group G1 is composed of, in order from the object plane side to the image plane side, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, and a fifth lens L5 with positive refractive power, wherein the first lens L1 is cemented with the second lens L2, and the fourth lens L4 is cemented with the fifth lens L5.
The zoom lens group G2 is composed of, in order from the object plane side to the image plane side, a sixth lens L6 with negative power, a seventh lens L7 with positive power, an eighth lens L8 with negative power, and a ninth lens L9 with negative power, wherein the seventh lens L7 and the eighth lens L8 are cemented.
The second fixed lens group G3, the focusing lens group G4, and the adjusting lens group G5 are each composed of two lenses.
In this embodiment, the long focal length of the long-focus zoom lens can be realized by setting a small number of lenses in the second fixed lens group G3, the focusing lens group G4, and the adjusting lens group G5, so that the imaging quality of the long-focus zoom lens is ensured to a certain extent, the miniaturization of the long-focus zoom lens is facilitated, and the cost of the long-focus zoom lens is greatly reduced.
Specifically, the second fixed lens group G3 is composed of, in order from the object plane side to the image plane side, a tenth lens L10 of positive power and an eleventh lens L11 of negative power.
The focusing lens group G4 is composed of a twelfth lens L12 of negative power and a thirteenth lens L13 of positive power in this order from the object plane side to the image plane side, and the twelfth lens L12 and the thirteenth lens L13 are cemented.
The adjusting lens group G5 is composed of a fourteenth lens L14 having negative refractive power and a fifteenth lens L15 having positive refractive power in this order from the object plane side to the image plane side, and the fourteenth lens L14 and the fifteenth lens L15 are cemented.
The long-focus zoom lens satisfies the following conditional expression:
fw＞90mm；
TTL＜170mm；
wherein fw is the focal length of the long-focus zoom lens in the wide-angle state, and TTL is the total optical length of the long-focus zoom lens.
The long-focus zoom lens meets the following conditional expression:
D56/TTL＞0.2；
wherein D56 is the spacing between the fifth lens L5 and the sixth lens L6.
In this embodiment, by increasing the distance between the fifth lens L5 and the sixth lens L6, that is, increasing the distance between the first fixed lens group G1 and the zoom lens group G2 in the wide-angle state, the moving distance of the zoom lens group G2 is reduced, the focus lens group G4 can better focus on the long-focus zoom lens in the telephoto state during focusing, and thus the imaging quality of the zoom lens in the telephoto state is increased.
The long-focus zoom lens meets the following conditional expression:
-3.5<fG4/fG2<-2；
wherein, fG2 is the focal length of the zoom lens group G2, and fG4 is the focal length of the focusing lens group G4.
By limiting the focal lengths of the zoom lens group G2 and the focus lens group G4, the possibility of too large change of a focusing curve is reduced, the possibility of insufficient optical power is also reduced, and the imaging reliability of the long-focal-length zoom lens is improved.
1<|ffw/fbw|<4；
1<|fft/fbt|<9；
Wherein ffw denotes a focal length of the first fixed lens group G1 and the zoom lens group G2 in the wide angle state, fbw denotes a focal length of the second fixed lens group G3, the focus lens group G4, and the adjustment lens group G5 in the wide angle state, fft denotes a focal length of the first fixed lens group G1 and the zoom lens group G2 in the telephoto state, and fbt denotes a focal length of the second fixed lens group G3, the focus lens group G4, and the adjustment lens group G5 in the telephoto state.
In this embodiment, by limiting the focal length ratio of the front group and the rear group in the wide-angle state and the telephoto state, the focal power of the long-focus zoom lens is reasonably distributed, the trend of light is stable, and each aberration can be well corrected while realizing zooming.
The tenth lens L10 is an aspherical lens.
In the embodiment, through the arrangement of the aspheric lens, the aberration and the deformation of the long-focus zoom lens are reduced, the resolving power of the zoom lens is increased, and the imaging quality of the zoom lens is improved.
The long-focus zoom lens satisfies the following conditional expression:
ΦL10/DL10＞1.4；
where Φ L10 is an effective aperture of the tenth lens L10, and DL10 is an optical total length of the tenth lens L10.
In this embodiment, the thickness of the tenth lens L10 is increased, so that the number of lenses in the second fixed lens group G3 is reduced, and the cost of the telephoto zoom lens is reduced.
|(R141-R152)/(R141+R152)|<0.1；
Where R141 is a radius of curvature of the curved surface of the fourteenth lens L14 facing the object plane side, and R152 is a radius of curvature of the curved surface of the fifteenth lens L15 facing the image plane side.
In this embodiment, the limitation of the focal power of the adjusting lens group G5 is realized by the limitation of the curvature radii of the fourteenth lens L14 and the fifteenth lens L15, the limitation of the optical path of the light in the adjusting lens group G5 is also realized, and the possibility of the optical path being too much deflected when passing through the adjusting lens group G5 is reduced.
In a second embodiment, as shown in fig. 1 to 4, a long-focus zoom lens is composed of five lens groups, and the long-focus zoom lens includes, in order from an object plane side to an image plane side:
a first fixed lens group G1 of positive power, a zoom lens group G2 of negative power, a stop STO, a second fixed lens group G3 of positive power, a focus lens group G4 of positive power, an adjustment lens group G5 of negative power and an auxiliary group, and a zoom lens group G2 and a focus lens group G4 move in the optical axis direction of the zoom lens.
The first fixed lens group G1 is composed of a first lens L1 with positive focal power, a second lens L2 with negative focal power, a third lens L3 with positive focal power, a fourth lens L4 with negative focal power and a fifth lens L5 with positive focal power in sequence from the object plane side to the image plane side, wherein the first lens L1 is cemented with the second lens L2, and the fourth lens L4 is cemented with the fifth lens L5;
the zoom lens group G2 is composed of, in order from the object plane side to the image plane side, a sixth lens L6 of negative power, a seventh lens L7 of positive power, an eighth lens L8 of negative power, and a ninth lens L9 of negative power, wherein the seventh lens L7 and the eighth lens L8 are cemented.
The second fixed lens group G3 is composed of a tenth lens L10 of positive power and an eleventh lens L11 of negative power in order from the object plane side to the image plane side.
The focusing lens group G4 is composed of a twelfth lens L12 of negative power and a thirteenth lens L13 of positive power in this order from the object plane side to the image plane side, and the twelfth lens L12 and the thirteenth lens L13 are cemented.
The adjustment lens group G5 is composed of a fourteenth lens L14 having negative refractive power and a fifteenth lens L15 having positive refractive power in this order from the object plane side to the image plane side, and the fourteenth lens L14 and the fifteenth lens L15 are cemented.
The auxiliary group is composed of an optical filter FI and protective glass CG in sequence from the object plane side to the image plane side.
Table 1 shows basic lens data of the zoom lens having a long focal length according to the present embodiment, table 2 shows variable parameters in table 1, and table 3 shows aspherical surface coefficients.
The plane number column indicates the plane number when the number is increased one by one toward the image side with the plane on the object side being the 1 st plane; the surface type column shows the surface type of a certain lens; the radius of curvature of a lens is shown in the column of radius of curvature, positive radius of curvature indicates that the surface is curved in the object side direction, and negative radius of curvature indicates that the surface is curved in the image side direction; the surface spacing on the optical axis of each surface from the surface adjacent to its image side is shown in the center thickness column; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 2, the WIDE column indicates specific numerical values of the respective variable parameters when the telephoto zoom lens is in the WIDE-angle end state, and the TELE column indicates specific numerical values of the respective variable parameters when the telephoto zoom lens is in the telephoto end state.
In Table 3, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
[ TABLE 1 ]
[ TABLE 2 ]
[ TABLE 3 ]
| S17 | S18 | |
| Conic constant (K) | -0.40 | -7.75 |
| Coefficient of 4 th order (A) | -3.16e-005 | -2.18e-006 |
| Coefficient of order 6 (B) | 1.13e-008 | 1.36e-008 |
| Coefficient of order 8 (C) | -6.63e-010 | -1.46e-009 |
| Coefficient of order 10 (D) | -2.85e-013 | 3.98e-012 |
In this embodiment, fw is 100mm, ft is 400mm, and TTL is 167.62 mm;
wherein fw is the focal length of the long-focus zoom lens in the wide-angle state, and TTL is the total optical length of the long-focus zoom lens.
D56min＝39.61mm，D56/TTL＝0.236；
Wherein D56 is the distance between the fifth lens L5 and the sixth lens L6, and D56min D56 is the minimum distance between the fifth lens L5 and the sixth lens L6.
fG2＝-8.5mm，fG4＝33.2mm；
fG4/fG2＝-3.9；
Wherein, fG2 is the focal length of the zoom lens group G2, and fG4 is the focal length of the focusing lens group G4.
ffw＝-70.0mm，fbw＝21.4mm，fft＝-604.5mm，fbt＝44.2mm；
|ffw/fbw|＝3.3，|fft/fbt|＝13.7；
Wherein ffw denotes a focal length of the first fixed lens group G1 and the zoom lens group G2 in the wide angle state, fbw denotes a focal length of the second fixed lens group G3, the focus lens group G4, and the adjustment lens group G5 in the wide angle state, fft denotes a focal length of the first fixed lens group G1 and the zoom lens group G2 in the telephoto state, and fbt denotes a focal length of the second fixed lens group G3, the focus lens group G4, and the adjustment lens group G5 in the telephoto state.
ΦL10＝21.1mm，DL10＝14.07mm；
ΦL10/DL10＝1.5；
Where Φ L10 is an effective aperture of the tenth lens L10, and DL10 is an optical total length of the tenth lens L10.
R141＝-9.95mm，R152＝-8.87mm；
|(R141-R152)/(R141+R152)|＝0.057；
Here, R141 is a curved surface of the fourteenth lens L14 facing the object plane side, and R152 is a curved surface of the fifteenth lens L15 facing the image plane side.
In a third embodiment, as shown in fig. 5 to 8, a long-focus zoom lens, which is composed of five lens groups, includes, in order from an object plane side to an image plane side:
a first fixed lens group G1 of positive power, a zoom lens group G2 of negative power, a stop STO, a second fixed lens group G3 of positive power, a focus lens group G4 of positive power, an adjustment lens group G5 of negative power and an auxiliary group, and the zoom lens group G2, the focus lens group G4 and the adjustment lens group G5 move in the optical axis direction of the zoom lens.
The first fixed lens group G1 is composed of a first lens L1 with positive focal power, a second lens L2 with negative focal power, a third lens L3 with positive focal power, a fourth lens L4 with negative focal power and a fifth lens L5 with positive focal power in sequence from the object plane side to the image plane side, wherein the first lens L1 is cemented with the second lens L2, and the fourth lens L4 is cemented with the fifth lens L5;
the zoom lens group G2 is composed of, in order from the object plane side to the image plane side, a sixth lens L6 of negative power, a seventh lens L7 of positive power, an eighth lens L8 of negative power, and a ninth lens L9 of negative power, wherein the seventh lens L7 and the eighth lens L8 are cemented.
The second fixed lens group G3 is composed of a tenth lens L10 of positive power and an eleventh lens L11 of negative power in order from the object plane side to the image plane side.
The focusing lens group G4 is composed of a twelfth lens L12 of negative power and a thirteenth lens L13 of positive power in this order from the object plane side to the image plane side, and the twelfth lens L12 and the thirteenth lens L13 are cemented.
The adjustment lens group G5 is composed of a fourteenth lens L14 having negative refractive power and a fifteenth lens L15 having positive refractive power in this order from the object plane side to the image plane side, and the fourteenth lens L14 and the fifteenth lens L15 are cemented.
The auxiliary group is composed of an optical filter FI and protective glass CG in sequence from the object plane side to the image plane side.
Table 4 shows basic lens data of the zoom lens having a long focal length according to the present embodiment, table 5 shows variable parameters in table 4, and table 6 shows aspherical surface coefficients.
The plane number column indicates the plane number when the number is increased one by one toward the image side with the plane on the object side being the 1 st plane; the surface type column shows the surface type of a certain lens; the radius of curvature of a lens is shown in the column of radius of curvature, positive radius of curvature indicates that the surface is curved in the object side direction, and negative radius of curvature indicates that the surface is curved in the image side direction; the surface spacing on the optical axis of each surface from the surface adjacent to its image side is shown in the center thickness column; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 5, the WIDE column indicates specific numerical values of the respective variable parameters when the telephoto zoom lens is in the WIDE-angle end state, and the TELE column indicates specific numerical values of the respective variable parameters when the telephoto zoom lens is in the telephoto end state.
In Table 6, K is the conic coefficient and e is the scientific count number, e.g., e-005 means 10-5.
[ TABLE 4 ]
[ TABLE 5 ]
| WIDE | TELE | |
| D1 | 39.28 | 49.82 |
| D2 | 12.03 | 1.50 |
| D3 | 4.18 | 32.00 |
| D4 | 28.41 | 1.50 |
| D5 | 1.00 | 0.10 |
[ TABLE 6 ]
| S17 | S18 | |
| Conic constant (K) | -0.21 | -16.32 |
| Coefficient of 4 th order (A) | -2.35e-005 | 5.93e-006 |
| Coefficient of order 6 (B) | 6.11e-008 | 1.45e-007 |
| Coefficient of order 8 (C) | -7.03e-010 | -1.34e-009 |
| Coefficient of order 10 (D) | 1.25e-012 | 3.18e-012 |
In this embodiment, fw is 100mm, ft is 400mm, and TTL is 159.94 mm;
wherein fw is the focal length of the long-focus zoom lens in the wide-angle state, and TTL is the total optical length of the long-focus zoom lens.
D56min＝39.58mm，D56/TTL＝0.247；
Wherein D56 is the distance between the fifth lens L5 and the sixth lens L6, and D56min D56 is the minimum distance between the fifth lens L5 and the sixth lens L6.
fG2＝-8.1mm，fG4＝31.1mm；
fG4/fG2＝-3.8；
Wherein, fG2 is the focal length of the zoom lens group G2, and fG4 is the focal length of the focusing lens group G4.
ffw＝-68.3mm，fbw＝23.4mm，fft＝-575.3mm，fbt＝42.1mm；
|ffw/fbw|＝2.9，1<|fft/fbt|＝13.7；
Wherein ffw denotes a focal length of the first fixed lens group G1 and the zoom lens group G2 in the wide angle state, fbw denotes a focal length of the second fixed lens group G3, the focus lens group G4, and the adjustment lens group G5 in the wide angle state, fft denotes a focal length of the first fixed lens group G1 and the zoom lens group G2 in the telephoto state, and fbt denotes a focal length of the second fixed lens group G3, the focus lens group G4, and the adjustment lens group G5 in the telephoto state.
ΦL10＝21.74mm，DL10＝9.66mm；
ΦL10/DL10＝2.25；
Where Φ L10 is an effective aperture of the tenth lens L10, and DL10 is an optical total length of the tenth lens L10.
R141＝-12.53mm，R152＝-14.28mm；
|(R141-R152)/(R141+R152)|＝0.065；
Here, R141 is a curved surface of the fourteenth lens L14 facing the object plane side, and R152 is a curved surface of the fifteenth lens L15 facing the image plane side.
In a fourth embodiment, as shown in fig. 1 to 8, an image pickup apparatus includes: the zoom lens system according to any one of the embodiments described above, and an image pickup element configured to receive an image formed by the zoom lens system.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A long focal length zoom lens, comprising:
the long-focus zoom lens is composed of five lens groups, and the long-focus zoom lens sequentially comprises from the object plane side to the image plane side:
the zoom lens group and the focusing lens group move along the optical axis direction of the long-focus zoom lens;
the first fixed lens group consists of a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power in sequence from the object plane side to the image plane side, wherein the first lens is cemented with the second lens, and the fourth lens is cemented with the fifth lens;
the zoom lens group consists of a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with negative focal power in sequence from the object plane side to the image plane side, wherein the seventh lens and the eighth lens are cemented;
the second fixed lens group, the focusing lens group and the adjusting lens group are all composed of two lenses.
2. The zoom lens according to claim 1, wherein:
the second fixed lens group consists of a tenth lens with positive focal power and an eleventh lens with negative focal power in sequence from the object plane side to the image plane side;
the focusing lens group consists of a twelfth lens with negative focal power and a thirteenth lens with positive focal power in sequence from the object plane side to the image plane side, and the twelfth lens and the thirteenth lens are cemented;
the adjusting lens group is composed of a fourteenth lens with negative focal power and a fifteenth lens with positive focal power in sequence from the object surface side to the image surface side, and the fourteenth lens and the fifteenth lens are cemented.
3. The zoom lens according to claim 1, wherein:
the long-focus zoom lens meets the following conditional expression:
fw＞90mm；
TTL＜170mm；
wherein fw is the focal length of the long-focus zoom lens in the wide-angle state, and TTL is the total optical length of the long-focus zoom lens.
4. A long focal length zoom lens according to claim 3, wherein:
the long-focus zoom lens meets the following conditional expression:
D56/TTL＞0.2；
wherein D56 is the spacing between the fifth lens and the sixth lens.
5. A long focal length zoom lens according to claim 1 or 3, wherein:
the long-focus zoom lens meets the following conditional expression:
-3.5<fG4/fG2<-2；
wherein fG2 is the focal length of the zoom lens group, and fG4 is the focal length of the focusing lens group.
6. A long focal length zoom lens according to claim 1 or 3, wherein:
the long-focus zoom lens meets the following conditional expression:
1<|ffw/fbw|<4；
1<|fft/fbt|<9；
wherein ffw is the focal length of the first fixed lens group and the zoom lens group in the wide-angle state, fbw is the focal length of the second fixed lens group, the focus lens group and the adjustment lens group in the wide-angle state, fft is the focal length of the first fixed lens group and the zoom lens group in the telephoto state, and fbt is the focal length of the second fixed lens group, the focus lens group and the adjustment lens group in the telephoto state.
7. A long focal length zoom lens according to claim 2, wherein:
the tenth lens is an aspherical lens.
8. The zoom lens according to claim 7, wherein:
the long-focus zoom lens meets the following conditional expression:
ΦL10/DL10＞1.4；
where Φ L10 is an effective aperture of the tenth lens, and DL10 is an optical total length of the tenth lens.
9. A long focal length zoom lens according to claim 2, wherein:
the adjusting lens group satisfies the following conditional expression:
|(R141-R152)/(R141+R152)|<0.1；
where R141 is a radius of curvature of the curved surface of the fourteenth lens element facing the object plane side, and R152 is a radius of curvature of the curved surface of the fifteenth lens element facing the image plane side.
10. An image pickup apparatus characterized by comprising:
the telephoto zoom lens as claimed in any one of claims 1 to 9;
and an image pickup element configured to receive an image formed by the telephoto zoom lens.
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