U.S. patent application number 17/003953 was filed with the patent office on 2021-04-22 for anamorphic lens.
This patent application is currently assigned to Zhongshan AZU Optoelectronics Technology Co., Ltd.. The applicant listed for this patent is Zhongshan AZU Optoelectronics Technology Co., Ltd.. Invention is credited to JIE LI, YU MAI, WEI WU.
Application Number | 20210116686 17/003953 |
Document ID | / |
Family ID | 1000005505179 |
Filed Date | 2021-04-22 |
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United States Patent
Application |
20210116686 |
Kind Code |
A1 |
LI; JIE ; et al. |
April 22, 2021 |
ANAMORPHIC LENS
Abstract
An ultra-wide-angle large-aperture anamorphic lens includes a
cylindrical lens group and a spherical lens group arranged in
sequence from the object side to the image side. The cylindrical
lens group includes a first lens, a second lens, the third lens and
the fourth lens. The first lens and the second lens are negative
refractive power cylindrical lenses, and the third lens and the
fourth lens are positive refractive power cylindrical lenses. The
spherical lens group includes a fifth lens, a sixth lens, . . . , a
thirteenth lens that are sequentially arranged along the direction
that the optical path points to the image side. A 2.4:1 widescreen
video or photo may be obtained; at the same time, because the
anamorphic lens is a front anamorphic design, in addition to the
anamorphic function, it will also have optical characteristics such
as elliptical out-of-focus flare and sci-fi line flare.
Inventors: |
LI; JIE; (ZHONGSHAN, CN)
; WU; WEI; (ZHONGSHAN, CN) ; MAI; YU;
(ZHONGSHAN, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Zhongshan AZU Optoelectronics Technology Co., Ltd. |
ZHONGSHAN |
|
CN |
|
|
Assignee: |
Zhongshan AZU Optoelectronics
Technology Co., Ltd.
ZHONGSHAN
CN
|
Family ID: |
1000005505179 |
Appl. No.: |
17/003953 |
Filed: |
August 26, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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PCT/CN2020/101864 |
Jul 14, 2020 |
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17003953 |
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16753399 |
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PCT/CN2019/108977 |
Sep 29, 2019 |
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PCT/CN2020/101864 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 13/06 20130101;
G02B 13/08 20130101; G02B 9/64 20130101; G02B 13/005 20130101 |
International
Class: |
G02B 13/08 20060101
G02B013/08; G02B 13/06 20060101 G02B013/06; G02B 9/64 20060101
G02B009/64; G02B 13/00 20060101 G02B013/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 26, 2019 |
CN |
201910916059.8 |
Jul 9, 2020 |
CN |
202010659844.2 |
Claims
1: A super wide-angle large aperture anamorphic lens comprising: a
cylindrical lens group and a spherical lens group in an arrangement
of an object side to an image side; wherein the cylindrical lens
group comprises, from the object side to the image side, a first
lens (1), a second lens (2), a third lens (3), and a fourth lens
(4) in a sequential order; wherein the first lens (1) and the
second lens (2) comprise negative optical power cylindrical lenses,
wherein the third lens (3) and the fourth lens (4) comprise
positive optical power cylindrical lenses; wherein the spherical
lens group comprises a fifth lens (5), a sixth lens (6) . . . to
Nth lens, where N is greater than or equal to a natural number of
10, in sequence along the direction of the optical path pointing to
the image side; a power distribution of the lenses constituting the
cylindrical group and the spherical group may satisfy the following
relationship: 23.6 mm<f.sub.(1-N)Y<24.4 mm 17.6
mm<f.sub.(1-N)X<19.2 mm;
1.20<f.sub.(1-N)Y/f.sub.(1-N)X<1.40;
3.50<f.sub.4Y/f.sub.(2-3)X<4.20; wherein a X direction is a
curvature direction of the first lens, and a Y direction is the
other direction that is 90 degrees to the curvature direction of
the first lens, wherein the subscript number of f comprises a
number of each lens, wherein f.sub.(M-N)Y comprises a combined
optical focal length of the total (N-M+1) lens in the Y direction
from a Mth lens to a Nth lens, wherein f.sub.(M-N)X comprises a
combined optical focal length of the total (N-M+1) lens in the X
direction from the Mth lens to the Nth lens, wherein M comprises a
natural number greater than or equal to 1 and less than N.
2: The according to claim 1, wherein the spherical lens group
comprises a fifth lens (5), a sixth lens (6), a seventh lens (7),
the eighth lens (8), the ninth lens (9), the tenth lens (10), the
eleventh lens (11), the twelfth lens (12) and the thirteenth lens
(13).
3: The super wide-angle large aperture anamorphic lens according to
claim 2, wherein the first lens (1) comprises a front stationary
group (14), wherein the second lens (2) to the sixth lens (6)
comprise an inner focus group (15), and the seventh lens (7) to the
thirteenth lens (13) comprise as a rear stationary group (16);
wherein a power distribution of the front stationary group (14),
the inner focus group (15) and the rear stationary group (16)
satisfies the following relationship:
-3.10<f.sub.1X/f.sub.(1-13)X<-2.70;
-2.10<f.sub.(2-6)Y/f.sub.(1-13)Y<-1.60;
-10.20<f.sub.(2-6)X/f.sub.(1-13)X<-9.20;
2.40<f.sub.(7-13)X/f.sub.(1-13)X<2.80; wherein a X direction
is a curvature direction of the first lens, and a Y direction is
the other direction that is 90 degrees to the curvature direction
of the first lens, wherein the subscript number of f comprises a
number of each lens, wherein f.sub.(M-N)Y comprises a combined
optical focal length of the total (N-M+1) lens in the Y direction
from a Mth lens to a Nth lens, wherein f.sub.(M-N)X comprises a
combined optical focal length of the total (N-M+1) lens in the X
direction from the Mth lens to the Nth lens, wherein M comprises a
natural number greater than or equal to 1 and less than N.
4: The super wide-angle large aperture anamorphic lens according to
claim 3, wherein the fifth lens (5), the ninth lens (9) and the
tenth lens (10) comprise all negative power spherical lens; wherein
the sixth lens (6), the seventh lens (7), the eighth lens (8), the
eleventh lens (11), the twelfth lens (12) and the thirteenth lens
(13) comprise spherical lens with positive power.
5: The super wide-angle large aperture anamorphic lens according to
claim 1, wherein the generatrix of the fourth lens (4) is
perpendicular to the generatrix of the third lens (3).
6: The super wide-angle large aperture anamorphic lens according to
claim 1, wherein the second lens (2) and the third lens (3) are
configured to join together.
7: The super wide-angle large aperture anamorphic lens according to
claim 1, wherein the eighth lens (8) and the ninth lens (9) are
configured to join together.
8: The super wide-angle large aperture anamorphic lens according to
claim 1, wherein the tenth lens (10) and the eleventh lens (11) are
configured to join together.
9: The super wide-angle large aperture anamorphic lens according to
claim 1, comprises a length less than 130 mm, and a front end being
matched with a 67 mm general filter.
10: The super wide-angle large aperture anamorphic lens according
to claim 1, comprises a focal length in the Y direction of 24.4 mm,
a focal length in the X direction of 18.3 mm, and an aperture of
2.8.
11: The ultra-wide-angle large-aperture anamorphic lens according
to claim 1, comprises a mass less than 750 g.
12: The super wide-angle large aperture anamorphic lens according
to claim 3, wherein the second lens (2) and the third lens (3) are
configured to join together.
13: The super wide-angle large aperture anamorphic lens according
to claim 3, wherein the eighth lens (8) and the ninth lens (9) are
configured to join together.
14: The super wide-angle large aperture anamorphic lens according
to claim 1, wherein the tenth lens (10) and the eleventh lens (11)
are configured to join together.
15: The super wide-angle large aperture anamorphic lens according
to claim 1, comprises a length less than 130 mm, and a front end
being matched with a 67 mm general filter.
16: The super wide-angle large aperture anamorphic lens according
to claim 1, comprises a focal length in the Y direction of 24.4 mm,
a focal length in the X direction of 18.3 mm, and an aperture of
2.8.
17: The ultra-wide-angle large-aperture anamorphic lens according
to claim 1, comprises a mass less than 750 g.
Description
TECHNICAL FIELD
[0001] The present invention relates to the field of lens
technology, in particular to a half-frame large aperture deformable
lens with a focal length of 24 mm.
BACKGROUND
[0002] With the rapid development of web technology, taking photos
and videos has become essential part for ordinary consumers. With
the promotion of 5G and other technologies in recent years, more
and more video sharing such as Vlog has been used. More individuals
shoot short films and micro movies with mobile phones, cameras and
other tools.
[0003] However, the current normal shooting screen ratio of mobile
phones, tablets, cameras and other devices on the market is 16:9,
but the cinematic widescreen video ratio is 2.4:1. Therefore, users
need to manually edit or digitally cropping method to edit the
captured images or videos. However, the pixels of the pictures are
sacrificed during cropping or editing.
[0004] Some professional anamorphic lens brands such as, Hawk from
Germany, Cooke from Great Britain, ARRI from Germany, Panavision
from the USA, Angenieux from France and SLR from Hong Kong are
usually tailored for professional customers. The prices of these
film equipment are generally over tens of thousands of dollars or
even more expensive, and anamorphic lenses themselves weighs
several kilograms.
[0005] Expensive and quality professional anamorphic lenses are not
suitable for ordinary users. Therefore, how to reduce the size of
super wide-angle large aperture anamorphic lens and reducing the
weight of the lens are technical problems that are to be solved at
present embodiments of the invention.
SUMMARY
[0006] Therefore, embodiments of the invention attempt technically
solve shortcomings in the professional super wide-angle large
aperture anamorphic lens where the quality is great but at a cost
that ordinary consumers could not afford. Aspects of the invention
provide a super wide-angle large aperture anamorphic lens that
solve the technical problem with the following embodiments:
[0007] A super wide-angle large aperture anamorphic lens may
include a cylindrical lens group and a spherical lens group in an
arrangement of an object side to an image side. The cylindrical
lens group may include, from the object side to the image side, a
first lens, a second lens, a third lens, and a fourth lens in a
sequential order. In one embodiment, the first lens and the second
lens may be negative optical power cylindrical lens. The third and
the fourth lenses may be positive optical power cylindrical lenses.
In addition, the generatrix of the fourth lens is perpendicular to
the generatrix of the third lens. The spherical lens group is
provided with a fifth lens, a sixth lens . . . to Nth lens, where N
is greater than or equal to a natural number of 10, in sequence
along the direction of the optical path pointing to the image
side.
[0008] The power distribution of the lenses constituting the
cylindrical group and the spherical group may satisfy the following
relationship:
23.6 mm<f.sub.(1-N)Y<24.4 mm
17.6 mm<f.sub.(1-N)X<19.2 mm;
1.20<f.sub.(1-N)Y/f.sub.(1-N)X<1.40;
3.50<f.sub.4Y/f.sub.(2-3)X<4.20;
[0009] In one embodiment, the X direction is the curvature
direction of the first lens, and the Y direction is the other
direction that is 90 degrees to the curvature direction of the
first lens. Among them, the subscript number of f may represent the
number of each lens constituting the anamorphic lens. Function
f.sub.(M-N) Y may represent the combined optical focal length of
the total (N-M+1) lens in the Y direction from the Mth lens to the
Nth lens. The function f.sub.(M-N)X may represent the combined
optical focal length of the total (N-M+1) lens in the X direction
from the Mth lens to the Nth lens. M comprises a natural number
greater than or equal to 1 and less than N.
[0010] Further, the spherical lens group is provided with a fifth
lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a
tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens
in sequence along a direction in which the optical path points to
the image side.
[0011] Further, the first lens may be a front stationary group of
the anamorphic lens, the second lens to the sixth lens may serve as
an inner focus group of the anamorphic lens, and the seventh lens
to the thirteenth lens may serve as a rear stationary group of the
anamorphic lens. In one embodiment, the power distribution of the
front stationary group, the inner focus group and the rear
stationary group may satisfy the following relationship:
-3.10<f.sub.1X/f.sub.(1-13)X<-2.70;
-2.10<f.sub.(2-6)Y/f.sub.(1-13)Y<-1.60;
-10.20<f.sub.(2-6)X/f.sub.(1-13)X<-9.20;
2.40<f.sub.(7-13)X/f.sub.(1-13)X<2.80;
[0012] In one embodiment, the X direction is the curvature
direction of the first lens, and the Y direction is the other
direction that is 90 degrees to the curvature direction of the
first lens. Among them, the subscript number of f may represent the
number of each lens constituting the anamorphic lens. Function
f.sub.(M-N)Y may represent the combined optical focal length of the
total (N-M+1) lens in the Y direction from the Mth lens to the Nth
lens. The function f.sub.(M-N) X may represent the combined optical
focal length of the total (N-M+1) lens in the X direction from the
Mth lens to the Nth lens. M comprises a natural number greater than
or equal to 1 and less than N.
[0013] In a further embodiment, the fifth lens, the ninth lens, and
the tenth lens may be all negative refractive power spherical
lenses; and the sixth lens, the seventh lens, the eighth lens, the
eleventh lens, the twelfth lens and the thirteenth lens may all be
positive refractive power spherical lenses.
[0014] In a further embodiment, the generatrix of the fourth lens
and the generatrix of the third lens may be perpendicular to each
other.
[0015] In a further embodiment, the second lens and the third lens
may be joined or cemented together.
[0016] In a further embodiment, the eighth lens and the ninth lens
may be joined or cemented together.
[0017] In a further embodiment, the tenth lens and the eleventh
lens may be joined or cemented together.
[0018] In a further embodiment, the length of the anamorphic lens
may be less than 130 mm, and the front end may match a common
filter with a diameter of 67 mm.
[0019] In a further embodiment, the focal length in the Y direction
of the anamorphic lens is 24.4 mm, the focal length in the X
direction is 18.3 mm, and the aperture is 2.8.
[0020] In a further embodiment, a mass of the anamorphic lens is
less than 750 g.
[0021] The technical solution of the present invention has the
following advantages:
[0022] 1. The super wide-angle large-aperture anamorphic lens
provided by aspects of the invention use an overall design method
to correct the overall aberrations of four cylindrical lenses and
nine spherical lenses, thereby shooting the lens horizontally while
increasing an angle of field of view. As a result, the actual
shooting picture width becomes larger. There would be no need for
post-editing, and 2.4:1 widescreen video or photos may be obtained
without sacrificing pixels. At the same time, aspects of the
invention may be a front-end anamorphic design, in addition to the
anamorphic function, the anamorphic lens of aspects of embodiments
may also provide optical characteristics such as elliptical
out-of-focus flare and sci-fi line flare.
[0023] 2. The ultra or super wide-angle large aperture anamorphic
lens provided by aspects of the invention include a unique optical
structure using X-direction and Y-direction cylindrical lenses for
a comprehensive design. In one embodiment, the generatrixs of the
first lens, the second lens and the third lens may be parallel to
each other. The generatrix of the fourth lens may be perpendicular
to the generatrix of the first three cylindrical lenses. Due to the
non-rotationally symmetrical optical properties of the cylindrical
lens, the cylindrical lens may enable in the Y direction the
correction of the astigmatic aberration of the anamorphic lens.
[0024] 3. The super wide-angle large aperture anamorphic lens
provided by yet another embodiment of the present invention may
include an inner focus design. For example, the first lens of the
13 lenses may be arranged in sequence from the object side to the
image side and may be used as the front stationary group. The
second lens to the sixth lens may be used as the inner focus group
and the seventh lens to the thirteenth lens may be used as the rear
fixed group. Through the movement of the inner focus group inside
the lens, the lens may focus on different object distances.
[0025] 4. The super wide-angle large aperture anamorphic lens
provided by a further embodiment of the present invention may be in
a compact design integrating a cylindrical lens and a spherical
lens. As such, aspects of the invention may form a lightweight
design while achieving a large aperture of F2.8. In particular, the
length of the lens is less than 130 mm, the front end of the lens
may be matched with 67 mm diameter universal filter, and a mass of
the lens may be less than 750 grams (g).
BRIEF DESCRIPTION OF DRAWINGS
[0026] In order to more clearly illustrate the specific embodiments
of the present invention or the technical solutions in the prior
art, the drawings needed to be used in embodiments or the
description of the prior art are briefly introduced below.
Obviously, the drawings in the following are some embodiments of
the present invention. For those of ordinary skill in the art,
other drawings may be obtained based on these drawings without
undue creative labor.
[0027] FIG. 1 is a cross-section view in an X direction according
to one embodiment of the present invention;
[0028] FIG. 2 is a cross-section view in an Y direction according
to one embodiment of the present invention;
[0029] FIG. 3 is an optical structure diagram in an X direction
according to a first embodiment of the present invention;
[0030] FIG. 4 is an optical structure diagram in an Y direction
according to a first embodiment of the present invention;
[0031] FIG. 5 is an optical structure diagram in an X direction
according to a second embodiment of the present invention;
[0032] FIG. 6 is an optical structure diagram in an Y direction
according to a second embodiment of the present invention;
[0033] FIG. 7 is an optical structure diagram in an X direction
according to a second embodiment of the present invention;
[0034] FIG. 8 is an optical structure diagram in an Y direction
according to a second embodiment of the present invention;
[0035] The following lists the labels for the reference
numbers:
[0036] 1--first lens; 2--second lens; 3--third lens; 4--fourth
lens; 5--fifth lens; 6--sixth lens; 7--seventh lens; 8--eighth
lens; 9--ninth lens; 10--tenth lens; 11--eleventh lens; 12--twelfth
lens; 13--anamorphic group; 14--front stationary group; 15--inner
focus group; 16--rear stationary group.
DETAILED DESCRIPTION
[0037] The technical solution of the present invention may be
clearly and completely described below with reference to the
accompanying drawings. Obviously, the described embodiments may be
part of the present invention, but not all of them. Based on the
embodiments of the present invention, all other embodiments
obtained by a person of ordinary skill in the art without creative
efforts shall fall within the protection scope of the present
invention.
[0038] In the description of the present invention, it is noted
that the terms "center", "up", "down", "left", "right", "vertical",
"horizontal", "inside", "outside", etc., are meant to indicate
orientation or positional relationship and they may be based on the
orientation or positional relationship shown in the drawings, and
may only be for the convenience of describing the present invention
and simplified description, and does not indicate or imply that the
device or element referred to must have a specific orientation, a
specific construction and operation as they are not be construed as
limiting the invention. In addition, the terms "first," "second,"
and "third" may be used for descriptive purposes only, and should
not be construed to indicate or imply relative importance.
[0039] In the description of embodiments of the present invention,
it is noted that the terms "installation", "connected", and
"connected" should be understood in a broad sense unless otherwise
specified and limited. For example, they may be fixed connections
or removable, connected or integrated; it may be mechanical or
electrical; it may be directly connected, or it may be indirectly
connected through an intermediate medium, or it may be the internal
communication of two elements. For those of ordinary skill in the
art, the specific meanings of the above terms of embodiments of the
present invention may be understood in a case-by-case basis.
[0040] In addition, the technical features involved in the
different embodiments of the present invention described below may
be combined with each other as long as they do not conflict with
each other.
Example 1
[0041] According to one embodiment, a 24 mm focal length,
half-frame, super wide-angle large-aperture anamorphic lens may be
shown in FIGS. 3-4. In one example, the anamorphic lens may include
13 lenses arranged along an optical path from the object side to an
image side from a first lens 1, a second lens 2, a third lens 3, a
fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an
eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens
11, a twelfth lens 12 and a thirteenth lens 13.
[0042] In one embodiment, the first lens 1, the second lens 2, the
third lens 3 and the fourth lens 4 may be cylindrical lenses. In
one embodiment, the second lens 2 and the third lens 3 may be
joined or cemented together. In another embodiment, the fifth lens
5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the
ninth lens 9, the tenth lens 10, the eleventh lens 11, the twelfth
lens 12 and the thirteenth lens 13 may be spherical lens.
[0043] In yet another embodiment, the first lens 1 and the second
lens 2 may be negative cylindrical lenses, while the third lens 3
and the fourth lens 4 may be positive power cylindrical lenses. In
another embodiment, the generatrix of the fourth lens may be
perpendicular to generatrix of the third lens. The fifth lens 5,
the ninth lens 9, and the tenth lens 10, in one embodiment, may all
be negative refractive power spherical lenses. In another
embodiment, the sixth lens 6, the seventh lens 7, the eighth lens
8, the eleventh lens 11, the twelfth lens 12, and the thirteenth
lens 13 may be spherical lens with positive refractive power. In
another embodiment, the eighth lens 8 and the ninth lens 9 may be
joined or cemented together, and the tenth lens 10 and the eleventh
lens 11 may be joined or cemented together.
[0044] In one embodiment, the joined or cemented lenses are
regarded as an integral unit. Therefore, the anamorphic lens of
this embodiment may be composed of 13 lenses in 10 groups.
[0045] In another embodiment, there are no specific limitations on
the combination of the second lens 2 and the third lens 3; the
eighth lens 8 and the ninth lens 9; the tenth lens 10 and the
eleventh lens 11. In one embodiment, the combination method may
include bonding with an adhesive. As an alternative embodiment,
other combination method may be used without departing from the
scope and spirit of the invention. In order to be distinguished
from the present application, one may modify the above example of
the combination method, such as bonding, integral molding, etc.
These methods may also adaptively change or modify the combined
lens shape. These alternative approaches are also within the scope
and spirit of protection of this application.
[0046] The specific values of the actual parameters of each lens
are not specifically limited. In this embodiment, the refractive
power of each lens or lens group satisfies the following
mathematical relationship:
23.6 mm<f.sub.(1-N)Y<24.4 mm
17.6 mm<f.sub.(1-N)X<19.2 mm;
1.20<f.sub.(1-N)Y/f.sub.(1-N)X<1.40;
3.50<f.sub.4Y/f.sub.(2-3)X<4.20;
-3.10<f.sub.1X/f.sub.(1-13)X<-2.70;
-2.10<f.sub.(2-6)Y/f.sub.(1-13)Y<-1.60;
-10.20<f.sub.(2-6)X/f.sub.(1-13)X<-9.20;
2.40<f.sub.(7-13)X/f.sub.(1-13)X<2.80.
[0047] Due to the non-rotational property of the cylindrical lens,
the X direction may be the curvature direction of the first lens
(as shown in FIG. 1), and the Y direction may be the other
direction that is 90 degrees to the curvature of the first lens (as
shown in FIG. 2). In one embodiment, the subscript number of f may
represent the number of each lens constituting the anamorphic lens.
Function f.sub.(M-N) Y may represent the combined optical focal
length of the total (N-M+1) lens in the Y direction from the Mth
lens to the Nth lens. The function f.sub.(M-N)X may represent the
combined optical focal length of the total (N-M+1) lens in the X
direction from the Mth lens to the Nth lens. M comprises a natural
number greater than or equal to 1 and less than N.
[0048] The following table may include parameters of each lens in
this embodiment that comply with the above mathematical
relationship:
TABLE-US-00001 TABLE 1 Surface X radius Y radius Thickness
Refractive Abbe Lens Shape (mm) (mm) (mm) index Number Mass (g)
First lens Cylindrical Inf Inf 3.220 1.63 60.2 Appx. 46.5
Cylindrical 32.720 Inf 12.100 Second lens Cylindrical 138.252 Inf
12.440 1.75 27.2 Appx. 66.3 Third lens Cylindrical 25.305 Inf
13.220 1.90 35.3 Appx. 67.6 Cylindrical -118.900 Inf 1.000 Fourth
lens Cylindrical Inf 292.284 3.620 1.49 70.4 Appx. 7.2 Cylindrical
inf -161.890 1.920 Fifth lens Spherical -113.652 -113.652 1.520
1.90 35.2 Appx. 13.6 Sperhical 28.240 28.240 3.550 Sixth lens
Spherical -327.020 -327.020 16.000 1.66 33.8 Appx. 32.4 Spherical
-67.080 -67.080 0.400 Seventh lens Spherical 67.362 67.362 13.100
1.80 46.6 Appx. 34.7 Spherical -67.362 -67.362 2.200 Eighth lens
Spherical 18.485 18.485 5.120 1.83 42.7 Appx. 4.8 Ninth lens
Spherical -69.140 -69.140 1.520 1.64 36.0 Appx. 2.3 Spherical
16.435 16.435 5.500 Light bar Spherical -Inf -Inf 7.700 Ten lens
Spherical -11.962 -11.962 1.530 1.92 20.9 Appx. 4.6 Eleventh lens
Spherical 35.138 35.138 6.700 1.49 70.4 Appx. 3.4 -16.018 -16.018
0.280 Twelfth lens Spherical 218.583 218.583 5.750 1.90 31.3 Appx.
10.2 Spherical -35.606 -35.606 0.230 Thirteenth lens Spherical
54.890 54.890 4.900 1.90 35.4 Appx. 13.1 Spherical -181.985
-181.985 18.000
[0049] In one embodiment, the first to fourth lenses may be
cylindrical lenses, and the generatrix of the fourth lens may be
perpendicular to the generatrix of the third lens, and the fifth to
thirteenth lenses may be spherical lenses.
[0050] In prior approaches of the anamorphic lens, the field of
view angle of the lens with a focal length of 24 mm and a 2.8
aperture is: V (vertical) 36.10.degree., and H (horizontal)
51.62.degree..
[0051] According to one embodiment of the invention, the field of
view angle of the lens with a focal length of 24 mm and an aperture
of 2.8 is: V (Vertical) 36.10.degree., and H (Horizontal)
68.75.degree.. The angle of the field of view in the comparison
test remains unchanged in the vertical direction, and the
deformation ratio of the field of view in the horizontal direction
is:
68.75/51.62=1.332.
[0052] In one embodiment, the actual wide format ratio may be in
the range of 2.35-2.40, so the distortion ratio of about 1.33, that
is, the horizontal field of view angle is increased by 33%, thus
realizing 1.33.times. distortion shooting.
[0053] When the anamorphic lens of this embodiment is produced, the
length of the anamorphic lens itself may be less than 130 mm, and
it matches the general specification filter with an outer diameter
of 67 mm. In another embodiment, the mass is less than 750 g, and
the volume and mass are much smaller than that of professional film
anamorphic lenses of the same specification on the market.
[0054] Among them, there are no limitations on the material for
each lens. In this embodiment, each lens may be made of optical
glass.
[0055] The lens of this application may further be designed to be
compatible with the bayonet of cameras of various brands on the
market according to actual use requirements, so as to achieve
personalized customization and universal interoperability.
Embodiment 2
[0056] As shown in FIG. 5 and FIG. 6, this embodiment may provide a
24 mm focal length half-frame super wide-angle large aperture
anamorphic lens. The difference between the first embodiment and
this embodiment is that this embodiment may include a positive
spherical lens and a negative spherical lens to replace the
original eighth lens 8 and the ninth lens 9 which are joined or
cemented together.
Embodiment 3
[0057] As shown in FIGS. 7 and 8 this embodiment may provide a 24
mm focal length half-frame super wide-angle large aperture
anamorphic lens. The difference between this embodiment and the
first embodiment is that the original thirteenth lens 13 is
replaced with a positive power spherical lens and a negative power
lens. The spherical lens is joined or cemented into a positive
cemented lens.
[0058] Aspects of the invention may be based on the first, second,
and third embodiments. If only a single positive lens or a negative
lens is simply split or separated, as long as the power
distribution of the split lens group is within the scope of the
original solution, no substantial innovation may be attributed to
such variation.
[0059] Moreover, there is no need and cannot be exhaustive for all
implementations. However, the obvious changes or variations
introduced thereby are still within the protection scope created by
the present invention.
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