U.S. patent application number 16/753399 was filed with the patent office on 2021-12-30 for anamorphic lens.
This patent application is currently assigned to GUANGDONG SIRUI OPTICAL CO., LTD.. The applicant listed for this patent is GUANGDONG SIRUI OPTICAL CO., LTD.. Invention is credited to JIE LI, WULIN LI, WEI WU.
Application Number | 20210405334 16/753399 |
Document ID | / |
Family ID | 1000005866705 |
Filed Date | 2021-12-30 |
United States Patent
Application |
20210405334 |
Kind Code |
A1 |
LI; JIE ; et al. |
December 30, 2021 |
ANAMORPHIC LENS
Abstract
An anamorphic lens includes a cylindrical lens group arranged in
a direction from an object side to an image side. The cylindrical
lens group includes an anamorphic group and together form an
imaging group. The anamorphic group includes a first lens, a second
lens, and a third lens arranged in a direction of an object side to
an image side. The second lens and the third lens may be joined
together and the first lens may be a negative optical power
biconcave cylindrical lens. Through the optical characteristics of
the cylindrical lens in the anamorphic group, the entering
horizontal light is compressed while the vertical light path
maintains unchanged. The imaging group comprehensively corrects the
light so that the horizontal field of view angle is increased by
about 33% to achieve a magnification by 1.33 times for an
anamorphic shooting.
Inventors: |
LI; JIE; (ZHONGSHAN, CN)
; WU; WEI; (ZHONGSHAN, CN) ; LI; WULIN;
(ZHONGSHAN, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GUANGDONG SIRUI OPTICAL CO., LTD. |
ZHONGSHAN |
|
CN |
|
|
Assignee: |
GUANGDONG SIRUI OPTICAL CO.,
LTD.
ZHONGSHAN
CN
|
Family ID: |
1000005866705 |
Appl. No.: |
16/753399 |
Filed: |
September 29, 2019 |
PCT Filed: |
September 29, 2019 |
PCT NO: |
PCT/CN2019/108977 |
371 Date: |
April 3, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 13/0045 20130101;
G02B 3/06 20130101; G02B 13/08 20130101; G02B 9/64 20130101 |
International
Class: |
G02B 13/08 20060101
G02B013/08; G02B 13/00 20060101 G02B013/00; G02B 3/06 20060101
G02B003/06; G02B 9/64 20060101 G02B009/64 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 26, 2019 |
CN |
201910916059.8 |
Claims
1: An anamorphic lens comprising: an anamorphic group (11)
comprising cylindrical lenses; an imaging group (12) comprising
spherical lenses, wherein the anamorphic group and the imaging
group are disposed with respect from an object side to an image
side; wherein the anamorphic group (11), from the object side to
the image side, sequentially arranges a first lens (1), a second
lens (2), and a third lens (3), wherein the first lens (1)
comprises a negative optical power cylindrical lens, wherein the
second lens (2) comprise a negative optical power cylindrical lens,
and wherein the third lens (3) comprises a positive optical power
cylindrical lens
2: The anamorphic lens according to claim 1, wherein the first lens
(1) comprises a negative optical power biconcave cylindrical
lens.
3: The anamorphic lens according to claim 1, wherein the second
lens (2) and the third lens (3) are configured to be laminated
together.
4: The anamorphic lens according to claim 3, wherein the second
lens (2) and the third lens (3) are configured to be joined
together.
5: The anamorphic lens according to claim 1, wherein the imaging
group (12), from the object side to the image side, sequentially
arranges lens a fourth lens (4), a fifth lens (5), a sixth lens
(6), a seventh lens (7), an eighth lens (8), a ninth lens (9), and
a tenth lens (10), wherein the fourth lens (4) comprises a positive
optical power meniscus spherical lens, wherein the seventh lens (7)
comprises a negative optical power spherical lens, wherein the
eighth lens (8) comprises a positive optical spherical lens,
wherein the ninth lens (9) comprises a positive optical power
biconvex spherical lens, and wherein the tenth lens (10) comprises
a positive optical power meniscus spherical lens.
6: The anamorphic lens according to claim 5, wherein the seventh
lens (7) and the eighth lens (8) are configured to be laminated
together.
7: The anamorphic lens according to claim 5, wherein the fifth lens
(5) and the sixth lens (6) are configured to be laminated together,
wherein the fifth lens (5) comprises a positive optical power
spherical lens and the sixth lens (6) comprises a negative optical
power lens.
8: The anamorphic lens according to claim 5, wherein the fifth lens
(5) and the sixth lens (6) comprise independent lenses, wherein the
fifth lens (5) comprises a positive optical power meniscus
spherical lens and the sixth lens (6) comprises a negative optical
power meniscus spherical lens, and wherein a concave surface of the
fifth lens (5) and a concave surface of the sixth lens (6) face the
image side.
9: The anamorphic lens of claim 1, wherein lenses in the anamorphic
group (11) and lenses in the imaging group (12) are configured to
satisfy following relationships: 500<abs(f.sub.1-3/f.sub.4-10);
45<f.sub.4-10<55; 1.60<f.sub.4-6/f.sub.4-10<2.10; and
0.60<f.sub.7-10/f.sub.4-10<0.80.
10: The anamorphic lens of claim 9, wherein lenses in the
anamorphic group (11) and lenses in the imaging group (12) are
further configured to satisfy following relationships:
1.10<abs(f.sub.1/f.sub.2-10)<1.40;
-0.80<f.sub.1/f.sub.2-3<-0.70;
0.60<f.sub.4/f.sub.4-6<0.90;
1.0<f.sub.9-10/f.sub.7-10<1.60; and
5.0<abs(f.sub.7-8/f.sub.7-10)<9.0. wherein f comprises a
focal length of lenses in an X direction, where the subscript
number of f represents a number of the 10th lenses of the
anamorphic lens, thus f.sub.1 comprises the focal length in the X
direction of the first lens, and f.sub.1-10 comprises the combined
focal length of the first to 10th lenses in the X direction of ten
lenses.
11: The anamorphic lens according to claim 1, wherein a length of
the anamorphic lens is less than 105 mm, and a maximum outer
diameter of the anamorphic lens is less than 70 mm.
12: The anamorphic lens according to claim 1, wherein the
anamorphic lens has a focal length in a Y direction of 50 mm and an
aperture of f/stop of 1.8.
13: The anamorphic lens according to claim 1, wherein a mass of the
anamorphic lens is less than 600 gram (g).
Description
TECHNICAL FIELD
[0001] The present invention relates generally to the field of lens
technology, and in particular, to an anamorphic lens.
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
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 anamorphic lens where the
quality is great but at a cost that ordinary consumers could not
afford. Aspects of the invention provide an anamorphic lens that
solve the technical problem with the following embodiments:
[0007] An anamorphic lens may include cylindrical lens group in an
arrangement of an object side to an image side. The cylindrical
lens group may include an anamorphic group of cylindrical lenses
and an imaging group having spherical lenses. The anamorphic group
may include a first lens, a second lens and a third lens in a
sequential order from the object side to the image side. The second
lens may be a negative optical power cylindrical lens and the third
lens may be a positive optical power cylindrical lens.
[0008] In one embodiment, the first lens may be a negative optical
power biconcave cylindrical lens.
[0009] In another embodiment, the second lens and the third lens
may be joined together.
[0010] The imaging group in a direction of light toward the image
side may dispose a fourth lens, a fifth lens, a sixth lens, a
seventh lens, an eighth lens, a ninth lens, and a tenth lens. In
one embodiment, the fourth lens may be a positive optical power
meniscus spherical lens; the fifth and eighth lenses may be
positive optical power; the sixth lens and the seventh lens may be
negative optical power spherical lenses; the ninth lens may be a
positive power biconvex spherical lens, and the tenth lens may be a
positive power meniscus spherical lens.
[0011] In one embodiment, the fifth lens and the sixth lens may be
joined together. In such an arrangement, the fifth lens may be a
positive optical power, and the sixth lens may be a negative
optical power lens.
[0012] In one embodiment, the fifth lens and the sixth lens may be
independent of each other. In such an arrangement, the fifth lens
may be a positive optical power meniscus lens, the sixth lens may
be a negative optical power meniscus lens. In one embodiment, the
concave surfaces of the fifth lens and the sixth lens may be
disposed toward the image side.
[0013] In one embodiment, the power distribution of the lenses
constituting the anamorphic group and the lenses constituting the
imaging group may possess the following relationship:
500<abs(f.sub.1-3/f.sub.4-10);
45<f.sub.4-10<55;
1.60<f.sub.4-6/f.sub.4-10<2.10;
0.60<f.sub.7-10/f.sub.4-10<0.80;
[0014] In another embodiment, the power distribution of the lenses
constituting the anamorphic group and the lenses constituting the
imaging group may also possess the following relationship:
1.10<abs(f.sub.1/f.sub.2-10)<1.40;
-0.80<f.sub.1/f.sub.2-3<-0.70;
0.50<f.sub.4/f.sub.4-6<0.80;
1.0<f.sub.9-10/f.sub.7-10<1.60;
5.0<abs(f.sub.7-8/f.sub.7-10)<9.0;
[0015] Where, f may represent a focal length of the lens in X
direction, where the subscript number of f represents a number of
the ten lenses of the anamorphic lens. For example, f.sub.1 may be
the focal length in the X direction of the first lens, and
f.sub.1-10 may be the combined focal length of the first to 10th
lenses in the X direction of ten lenses, and so on.
[0016] In yet another embodiment, the length of the anamorphic lens
may be less than 105 mm, and the large outer diameter of the
anamorphic lens may be less than 70 mm.
[0017] In a further embodiment, the focal length in the Y direction
of the anamorphic lens may be 50 mm, and the aperture may be an
f-stop of 1.8.
[0018] In a further embodiment, the mass of the anamorphic lens may
be less than 600 g.
[0019] The technical solution of the present invention may include
the following advantages:
[0020] 1. An anamorphic lens as provided by embodiments of the
present invention may include a cylindrical lens arranged from the
object side to the image side as an anamorphic group and an imaging
group including spherical lenses. The anamorphic group may include
a first lens, a second lens, and a third lens that are disposed in
a sequential order, and the second lens and the third lens may be
joined together. The first lens may be a negative optical power
biconcave cylindrical lens, the second lens may be a positive
optical power cylindrical lens and the third lens may be a positive
optical power cylindrical lens.
[0021] Use the optical characteristics of the cylindrical lenses in
the anamorphic group to "compress" the horizontally entering light
while the light entering in the vertical direction remains
unchanged, the imaging group thereafter may comprehensively correct
the light passing therethrough. Such aspects may increase the angle
of field of view for the horizontal shooting of the lens, which may
increase the width the field of the actual shot or filming. Aspects
of the invention no longer need post-processing or editing of the
images or films, so that users may still obtain a ratio of 2.4:1
for a widescreen video or photos without sacrificing pixels as a
result of the editing. At the same time, because the anamorphic
group may be include a cylindrical lens, the anamorphic lens of
embodiments of the invention may further include an oval shaped
out-of-focus flare, sci-fi line flare, and other optical
characteristics in addition to the anamorphic function.
[0022] 2. The anamorphic lens as provided by embodiments of the
present invention may include the power distribution relationship
of the lens in the anamorphic group, and the lens in the imaging
group:
[0023] 500<abs(f.sub.1-3/f.sub.4-10); 45<f.sub.4-10<55;
1.60<f.sub.4-6/f.sub.4-10<2.10;
0.60<f.sub.7-10/f.sub.4-10<0.80;
1.10<abs(f.sub.1/f.sub.2-10)<1.40;
-0.80<f.sub.1/f.sub.2-3<-0.70;
0.50<f.sub.4/f.sub.4-6<0.80;
3.0<f.sub.10/f.sub.7-10<4.50;
1.10<abs(f.sub.2-10/f.sub.1-10)<1.60; where, f may represent
a focal length of the lens in X direction, where the subscript
number of f represents a number of the ten lenses of the anamorphic
lens. For example, f.sub.1 may be the focal length in the X
direction of the first lens, and f.sub.1-10 may be the combined
focal length of the first to 10th lenses in the X direction of ten
lenses, and so on.
[0024] Embodiments of the invention may increase the field of view
of 50 mm f/stop of 1.8 half-frame lens horizontally by 33%, while
the vertical field of view may remain the same, resulting in a
smaller sized 50 mm large aperture anamorphic lens.
DESCRIPTION OF THE DRAWINGS
[0025] 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.
[0026] FIG. 1 is an optical structure diagram in an X direction
according to a first embodiment of the present invention;
[0027] FIG. 2 is an optical structure diagram in an Y direction
according to a first embodiment of the present invention;
[0028] FIG. 3 is an optical structure diagram in an X direction
according to a second embodiment of the present invention;
[0029] FIG. 4 is an optical structure diagram in an Y direction
according to a second embodiment of the present invention;
[0030] The following lists the labels for the reference
numbers:
[0031] 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--anamorphic group lens;
12--imaging group.
DETAILED DESCRIPTION
[0032] 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.
[0033] 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.
[0034] 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.
[0035] 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
[0036] As shown in FIG. 1 and FIG. 2, one embodiment may include a
50 mm half-frame large aperture anamorphic lens. In one embodiment,
the lens described below may be transparent lens. The anamorphic
lens may include ten lenses arranged along the optical path from an
object side to an image side, which may include 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,
and a tenth lens 10.
[0037] In one embodiment, the first lens 1, the second lens 2, and
the third lens 3 may be cylindrical lenses. The second lens 2 and
the third lens 3 may be joined together. Together with the first
lens 1 to form an anamorphic group 11. The fourth lens 4, the fifth
lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8,
the ninth lens 9, and the tenth lens 10--these seven lenses--in one
embodiment, may be spherical lens. The fifth lens 5 and the sixth
lens 6 may be joined together, and the seventh lens 7 and the
eighth lens 8 may be joined together. These seven lenses may form
an imaging group 12.
[0038] In one embodiment, the first lens 1 may be a negative
optical power biconcave cylindrical lens. The second lens 2 may be
a negative cylindrical lens, and the third lens 3 may be a positive
optical power cylindrical lens. The fourth lens 4 may be a positive
optical power meniscus spherical lens, and a concave surface of the
fourth lens 4 is disposed toward the image side.
[0039] In a further embodiment, the fifth lens 5 may be a positive
optical power spherical lens. The sixth lens 6 and the seventh lens
7 may be negative optical power spherical lenses. The ninth lens 9
may be a positive optical power biconvex spherical lens. The tenth
lens 10 may be a positive optical power meniscus spherical lens,
and the convex surface of the tenth lens may be convex\ toward the
object side.
[0040] In one embodiment, the lenses may be joined together as a
unit. In this embodiment, the second lens 2 and the third lens 3
may be joined together. The fifth lens 5 and the sixth lens 6 may
be joined together, and the seventh lens 7 and the eighth lens 8
may be joined together. Therefore, the anamorphic lens of this
embodiment may comprise 10 elements and 7 groups.
[0041] In a further embodiment, the combinations of the second lens
2 and the third lens 3, the sixth lens 6 and the seventh lens 7,
and the eighth lens 8 and the ninth lens 9 are not specific
limitation. For example, in this Example, the joining method may be
via bonding. As an alternative embodiment, based on the spirit and
scope of the present invention, in order to distinguish it from
embodiments of the present application, the above-mentioned
combination methods may be modified, such as lamination, gluing,
integrated molding, or the like. After such bonding, the shape of
the composite or combined lens may then be appropriately adjusted
according to the above examples. Therefore, these alternative
approaches may also be within the scope and spirit of the
invention.
[0042] In a further embodiment, the Example may provide that the
fourth lens 4 in the imaging group may be an independent lens. As
an alternative embodiment, the fourth lens 4 may be split to two,
multiple lenses or use two or multiple lenses joined together as a
replacement. When replacing the fourth lens 4, as long as the
replacement lens satisfy the optical power relationship, for
example, "0.60<f.sub.4/f.sub.4-6<0.90". Therefore, on the
basis of the Example, any attempt to distinguish over the present
invention by replacing lenses based on the number of lenses or a
combination thereof are within the conception of the present
application and should still fall within the spring and scope of
the present invention.
[0043] In a further embodiment, the Example may provide that the
fifth lens 5 and the sixth lens 6 be joined together. As an
alternative embodiment, the fifth lens 5 and the sixth lens 6 may
be split into two or more independent lenses. In yet another
embodiment, the joined lenses of the fifth lens 5 and the sixth
lens 6 may be replaced with a single lens. Therefore, on the basis
of the Example, any attempt to distinguish over the present
invention by replacing the fifth lens 5 and the sixth lens 6,
regardless of whether the lens type or shape has changed, or it is
an independent lens or a combined lens, as long as the replacement
lens satisfy the optical power relationship, for example,
"0.60<f.sub.4/f.sub.4-6<0.90," then such replacement still
falls within the spring and scope of the present invention.
[0044] In a further embodiment, the Example may provide that the
seventh lens 7 and the eighth lens 8 be joined together. As an
alternative embodiment, the seventh lens 7 and the eighth lens 8
may be split into two or more independent lenses. In yet another
embodiment, the joined lenses of the fifth lens 5 and the sixth
lens 6 may be replaced with a single lens. Therefore, on the basis
of the Example, any attempt to distinguish over the present
invention by replacing the fifth lens 5 and the sixth lens 6,
regardless of whether the lens type or shape has changed, or it is
an independent lens or a combined lens, as long as the replacement
lens satisfy the optical power relationship, for example,
"5.0<abs(f.sub.7-8/f.sub.7-10)<9.0," then such replacement
still falls within the spring and scope of the present
invention.
[0045] In a further embodiment, the Example may provide that the
ninth lens 9 and the tenth lens 10 be independent of each other. In
one embodiment, the ninth lens 9 and the tenth lens 10 may satisfy
an optical power relationship of
"1.0<f.sub.9-10/f.sub.7-10<1.60". Therefore, on the basis of
the Example, any attempt to replace the ninth lens 9, the tenth
lens 10 with a composite lens with multiple lenses joined together,
a single lens, regardless of whether the lens type or shape has
changed, or through a combination to modify it, still falls within
the spring and scope of the present invention.
[0046] In one embodiment, specific numerical values of the actual
parameters of each lens are not specifically limited. In this
embodiment, the power of each lens or lens group may satisfy the
following mathematical relationship:
500<abs(f.sub.1-3/f.sub.4-10);
45<f.sub.4-10<55;
1.60<f.sub.4-6/f.sub.4-10<2.10;
0.60<f.sub.7-10/f.sub.4-10<0.80;
[0047] each lens's optical power further may satisfy the following
mathematical relationship;
1.10<abs(f.sub.1/f.sub.2-10)<1.40;
-0.80<f.sub.1/f.sub.2-3<-0.70;
0.60<f.sub.4/f.sub.4-6<0.90;
1.0<f.sub.9-10/f.sub.7-10<1.60;
5.0<abs(f.sub.7-8/f.sub.7-10)<9.0;
[0048] Where, f may represent a focal length of the lens in X
direction (e.g., horizontal direction), where the subscript number
of f represents a number of the ten lenses of the anamorphic lens.
For example, f.sub.1 may be the focal length in the X direction of
the first lens, and f.sub.1-10 may be the combined focal length of
the first to 10th lenses in the X direction of ten lenses, and so
on.
[0049] The following table may The actual parameters of each lens
of this embodiment that meet the above mathematical relationship
are listed below:
TABLE-US-00001 Thick- Refrac- Surface radius ness tive Abbe Mass
Lens Shape (mm) (mm) index Number (g) First lens Cylindrical
-68.330 7.460 1.5113 67.60 40.2 Cylindrical 53.600 5.827 Second
lens Cylindrical inf 12.000 1.8325 20.11 60.4 Third lens
Cylindrical 31.100 8.000 1.9235 26.00 38.2 Cylindrical -88.300
1.260 Fourth lens Spherical 29.570 4.520 1.9108 35.25 16.5
Spherical 66.000 0.220 Fifth lens Spherical 22.467 5.660 1.6968
55.53 8.5 Sixth lens Spherical 203.000 3.030 1.6435 28.63 9.6
Spherical 13.166 3.444 Light bar 10.719 Seventh lens Spherical
-15.270 1.580 1.6612 27.24 4.8 Eighth lens Spherical 95.000 10.350
1.8040 46.60 10.2 Spherical -27.650 0.200 -- Ninth lens Spherical
131.600 4.450 1.8040 46.60 8.2 Spherical -69.800 0.100 Tenth lens
Spherical 89.800 9.420 1.8040 46.60 23.2 Spherical inf
[0050] In one aspect, the first lens 1 may be a large Abbe number
low-dispersion lens.
[0051] In one aspect, before applying the anamorphic lens of the
invention, a field of view of a given 50 mm lens with f/stop of 1.8
as the focal length is: V (vertical) 18.25 degree, H (horizontal)
27.04 degree.
[0052] After applying the anamorphic lens of embodiments of the
invention, the field of view of the given 50 mm lens with f/stop of
1.8 as the focal length is: V (vertical) 18.25 degree, H
(horizontal) 36.21 degree.
[0053] The angle of view of the contrast test field of view is
unchanged in the vertical direction, and the angle of field
deformation in the horizontal direction comparison is:
36.21/27.04=1.339.
[0054] In such an embodiment, the actual width ratio is in the
range of 2.35-2.40, so the anamorphic ratio is 1.33. For example,
the horizontal field of view angle is increased by 33%, so that
1.33 times anamorphic shooting may be achieved.
[0055] According to embodiments of the invention, when the
anamorphic lens according to aspects of the invention is
manufactured, the length of the anamorphic lens itself is less than
105 mm, with a maximum outer diameter less than 70 mm, and a mass
less than 600 g. Such dimension is far smaller than similar type
photographic camera interchangeable lenses, and, at the same time,
it is far smaller than the professional cinema anamorphic lenses of
the same specifications on the market.
[0056] In a further embodiment, no limitation is directed to the
materials used for the lenses. For example, embodiments of the
invention may use optical grade glasses for the lenses.
[0057] Moreover, the lens of the present application may be
designed to be compatible with the bayonet of various brands of
camera in the market according to the actual use's specification,
so as to achieve personalized customization and universal use.
Example 2
[0058] Embodiments of the invention may provide a 50 mm focal
length half-frame anamorphic lens with large aperture. In one
example, Example 2 differs from the Example 1, as shown in FIG. 3
and FIG. 4, in that the combined lenses of the fifth lens 5 and the
sixth lens 6 may be two independent lenses. In one aspect, the
fifth lens 5 may be a positive optical power meniscus spherical
lens, and the concave surface of the fifth lens 5 may face the
image side. In one embodiment, the sixth lens 6 may be a negative
optical power meniscus spherical lens and the concave surface of
the sixth lens 6 may face the image side.
[0059] In this Example, as compared to Example 1, as the fifth lens
5 and the sixth lens 6 may be independent, the anamorphic lens may
comprise 10 lenses, a group of 8.
[0060] In a further embodiment, on the basis of Example 1, the
fifth lens 5 and the sixth lens 6 may be replaced. Once replaced,
the optical path may be altered. As such, the lens type or shape
may be adjusted accordingly to satisfy the optical power of Example
1. As such, such adjustments, while may try to distinguish over the
present invention to change the lens type, shape or number, still
falls within the spring and scope of the present invention.
[0061] Obviously, the foregoing embodiments may merely be an
example with clear description and not as a limitation. For those
of ordinary skill in the art, other different forms of changes or
modifications may be made on the basis of the above description.
There is no need and cannot be exhaustive to illustrate all
implementations. However, the obvious changes or variations
introduced thereby are still within the protection scope created by
the present invention.
* * * * *