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Патент USA US3033091

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JDU-QDO
5H
OR
390339015!I
May 8, 1962
c. BAUR ETAL
3,033,081
PHOTOGRAPHIC NILE-OBJECTIVE
7269-5’
Filed Oct. 28, 1958
INVENTOR.
an 8A 08
BY
CHRIST/AN orzn/
hum /. 071%‘.
m
United States Patent 0
3,033,081
M
IC€
Patented May 8, 1962
2
1
ber are concave to the rear.
3,033,081
PHOTOGRAPHIC TELE-OBJECTIVE
Carl Baur, Munich-Baldham, and Christian Otzen,
Munich, Germany, assiguors to Agfa Aktiengesellschaft,
Munich, Germany
Filed Oct. 28, 1958, Ser. No. 770,167
Claims priority, application Germany Nov. 5, 1957
The third meniscus mem
ber and the fourth meniscus member are spaced from
each other an air space greater than the air space be
tween the ?rst, second and third meniscus members.
The novel features which are considered as character
istic for the invention are set forth in particular in the
appended claims. The invention itself, however, both
as to its construction and its method of operation, togeth
er with additional objects and advantages thereof, will
The present invention relates to a photographic tele 10 be best understood from the following description of
speci?c embodiments when read in connection with the
objective and more particularly to a high-power photo
accompanying drawing, whose single FIGURE is a side
graphic tele-objective which comprises four meniscus
view of a tele-objective according to a preferred embodi
members which are spaced from each other by air spaces.
ment of the present invention.
It is characteristic for tele-objectives that the sum of
Referring now to the drawing it will be seen that four
the rear intercept length and of the total length of the 15
10 Claims. (Cl. 88—--57)
objective is smaller than the focal length of the objec
tive so that the rear principal point of the optical system
is located forwardly of the rearmost lens vertex. The
known tele-objectives all include a rearwardly located
lens member of negative power of refraction. The nega 20
tive rear member effects a location of the rear principal
meniscus members are provided. The meniscus mem
ber 1 in order from the front to the rear is a singlet hav
ing an axial thickness d1, and the second meniscus mem
ber 2 is also a singlet having an axial thickness d,;. Me
niscus members 1 and 2 are separated by an axial air
space 11.
The front face of meniscus 1 has the radius of curva
ture R1 and the rear face of meniscus 1 has the radius
of curvature R2. The front face of meniscus 2 has a ra
jective.
It is one object of the present invention to improve 25 dius of curvature R3 and the rear face of meniscus 3 has
a radius of curvature R4.
the known tele-objectives, and to provide a photographic
The third meniscus member is a cemented doublet
tele-objective of high power.
consisting of a converging lens element 3, and of a di
Another object of the present invention is to provide
verging lens element 4. An air space I, separates me
a photographic tele-objective in which coma, chromatic
aberration, astigmatism, spherical aberration, and distor 30 niscus 2 from lens element 3. Lens element 3 has an
axial thickness d;,, and lens element 4 has an axial thick
tion are fully corrected.
ness d,. The front face of lens element 3 has the
In accordance with the present invention, the rearmost
radius of curvature R5, the cemented interfaces of lens
lens member of the objective is positive and converging,
elements 3 and 4 have a radius of curvature R6, and the
contrary to the known tele-objective in which the rear
member is negative. In accordance with the present in 35 rear face of lens element 4 has a radius of curvature R7.
point forwardly of the lens vertex of the rear member of
the objective whereby the objective becomes a tele-ob
vention, the lens member which is located forwardly of
The fourth meniscus member constitutes the rear mem
ber of the objective, and consists of a diverging lens ele
ment 5, and a converging lens element 6. The axial
great air space, is made with a far higher negative power
thickness of lens element 5 is d5, and the axial thickness
of refraction as compared with the known tele-objectives.
The cooperation of the opposite powers of refraction of 40 of lens element 6 is de. An air space 13, which is great
er than air space 11 or air space [2, separates lens ele
these two members effects a placement of the rear prin
ments 4 and 5. The front face of lens element 5 has
cipal point of the objective forwardly of the lens vertex
a radius of curvature R8, the cemented interfaces of
of the rearmost lens member, if the air space between
lens elements 5 and 6 have a radius of curvature R9,
the two lens members is suitably designed.
and the rear face of lens element 6 has a radius of curva
In order to reduce distortion, and chromatic aberra
ture R10 and is concave to the rear.
tion, and furthermore in order to obtain the smallest pos
the rear lens member and is spaced from the same by a
sible diameter of the rear face of the rear member of the
objective, it is advantageous to provide as a rear member
In order to correct coma and astigmatism in tele-ob
jectives according to the present invention which have
an aperture of 1:2, or 1:2.8 with angle of ?eld of 20°
a positive meniscus having a rear face concave to the
rear. The tele-objective according to the present inven 50 and 30° respectively, the radius of curvature of the rear
face of lens element 4 is greater than 0.25 times, and
tion includes four meniscus members whose outer surfaces
smaller than 0.5 times the total axial length of the ob
are so designed that they are concave to the rear.
jective, which may be mathematically expressed as fol
The photographic tele-objective according to the pres
lows:
ent invention comprises four meniscus members spaced
by air spaces, the ?rst and second meniscus members in 55
order from the front to the rear being converging, the
third meniscus member being diverging and of high nega
Furthermore, the radius of curvature R5 of the front
face of lens element 3 is greater than 2.5 times and smaller
ber being converging and of low positive power of refrac
tion so that the rear principal point of the objective is 60 than four times the radius of curvature R7 of the rear face
tive power of refraction, and the fourth meniscus mem
located forwardly of the rear vertex of the fourth menis
cus member.
of lens element 4, which may be mathematically ex
pressed as follows:
In the preferred embodiment of the present invention,
the ?rst and second meniscus members are singlets, and
The absolute value of the radius of curvature R, of
the third and fourth meniscus members are doublets. 65
the cemented interfaces of lens elements 3 and 4 is greater
The concave faces of at least the fourth meniscus mem
8,033,081
3
TABLE I
than eight times the radius of curvature R7 of the rear
face of lens element 4, and smaller than eight times the
radius of curvature R5 of the front face of lens element 3
which may be mathematically expressed as follows:
Lens
Elements
The sum of the axial thicknesses ds and d4 of lens ele
Radll
1 ........... ._
ments 3 and 4 is greater than one tenth of the focal length
of the objective, and smaller than two tenths of the
focal length of the objective, which may be mathemati 10
cally expressed as follows:
R1 =+0. 61183]
R; =+7. 46413]
R; -+0.34634f
2 ........... .-
Thickness
and Airspaces
11,
di=0.07492f
m=1.62041
v1=60.3
n;=1.6204l
v;=60. 3
It =0. 00085}
d1=0.05623f
R4 =-+0. 65803f
V
lz=0.040%j
R; -+0.70437f
3 ........... __
d3=0-14808f
m=1.51009
v;=63.4
(‘IF-0. 01339]
"i=1. 72825
v|=28. 3
di=0.02677f
m=1.72340
vr=38.0
ds=0.08923f
m=l. 72825
“=28 3
R. --2. 5101s;
In order to obtain the best correction of the spherical
4 ........... ._
and astigmatic aberrations, the axial air space I: between
\lens elements 4 and 5 is greater than 17%, and smaller 15
than 25% of the focal length of the objective as a whole,
which may be mathematically expressed as follows:
R1 =+0. 22914!
Rs =+0. 72151 f
5 ........... ._
6 ........... -_
Rn =+0. 29815]
Rm=+4. 53777]
l:=0. 22123]
The picture quality is further improved with regard 20
In the above table n9 is the index of refraction for the
D line of the spectrum having wave length of 587.6 mg,
and small v is the dispersive index. The powers of refrac
tion of the lens elements are given in the following table
of the front face of lens element 2 and ?ve-hundredths 25 wherein the faces of the lens elements are identi?ed by
subscripts referring to the radii of curvature associated
of the ‘focal length f of the objective as whole which may
with the respective lens faces.
be mathematically expressed as follows:
to astigmatism and coma if one-sixth of the sum of the
radii of curvature R1, R5, and R8 of lens elements 1, 3
and 5, respectively is greater than the sum of, and smaller
than the difference between the radius of curvature R3
Wamow
glilgi'?>aa-o.osf
TABLE II
<7)
(s)
Lens Elements
Powers of Refraction (P1 to P10)
Surface (R1 )Pl =+l. 01402”
Surface (n, )P, --o. 08312”
Surface (R; )P; =+1. 191331;
The correction of the objective is further improved if
the sum of the axial thicknesses ds and d, of lens elements 85
5 and 6 is greater than the axial thickness d1 of lens ele
ment 1, but smaller than one-fifth of the focal length of
the objective, which may be mathematically expressed as
Surface (Rs )Ps =—0. 08691”
Surface (R1 )P: =-3.178l9/f
Surface (R. )P, ==+1.002s2//
40
A particular advantage of the present invention is the
small diameter of the lens elements 5 and 6, while full
marginal brightness is maintained.
The diameter D10
of lens elements 5 and 6 is less than one-?fth of the focal 45
length of the objective, which may be mathematically ex
pressed as follows:
D10<0.20f
(10)
Also, the rear intercept length so’ can be made less than
36% of the focal length of the objective, which may be
Example II
The aperture of the objective is 1:28, the angle of ?eld
is 30", and the rear intercept length is 0.34522 for a
focal length f of 1.000.
mathematically expressed as follows:
The small diameter of the rear meniscus 5, 6 of the
objective and the small rear intercept length of the ob 55
jective are particularly important for the use of high
power tele-objectives according to the present invention
for photographic cameras which have a central shutter ar
ranged between the rear meniscus 5, 6 and the picture
frame.
60
A high-power tele-objective according to the present
invention can be used for all types of cameras including
cameras provided with curtain shutter, or iris diaphragm
shutter, but does not require expensive glass of high re
fractive power. At the same time, spherical, chromatic, 65
TABLE III
Lens
Elements
1 ___________ ._
2........... __
3 ........... -.
4 ___________ __
and astigmatic aberrations, and coma are uniformly cor
rected to such an extent that the high picture quality of
the objective at an aperture of 1:2, 1:2.8, can be hardly
improved by reducing the aperture.
The following examples are illustrative for tele-objec 70
tives according to the present invention:
Example 1
5........... ._
B ___________ .-
Radll
R, =+0.60920f
R1 =+5.s9959/
Rs =+0.33517f
Rt =+0.63881f
R5 =+0.68151f
Ru -—2.42845]
R1 =+0.22177f
R; ==+0.69730f
Rn =+0.36838f
R1o=+624337f
Thickness
and Alrspaces
n»
V
d|=0.07246f
m=l.62041
91:60.3
1u=l.62041
1n=60.3
Ila-0.14321!
m=1.51009
v;==63.4
d4=0.0l294f
m=1.72825
v4=28.3
ds=0.02589f
m=1.72340
v;==38.0
ds=0.08630f
m=1.72825
as=28.3
li=0.00082f
d:=0.05438f
l1=0.03891f
ls=0.2l396f
Example IV
The aperture is 1:2.8, the angle of ?eld is 30° and
The aperture is 1:2, the angle of ?eld is 20°, and the
the
rear intercept length is 0.35485 for a focal length f
rear intercept length is 0.31813 for a focal length f of
76 of 1.000.
1.000.
3,033,081
5
TABLE IV
Lens
Elements
Radii
Thickness
and Airspaces
m.
V
d1=0.07225f
m=1.62041
vr=60.3
m=1.62041
v1=60.3
6
length of the objective as a whole; and the sum of the
axial thicknesses of said lens elements of said third me
niscus member being greater than 0.10 times and smaller
than 0.20 times the focal length of the objective as a
whole.
2. Photographic tele-objective comprising, four menis
1 ........... _-
2 ........... __
3 ___________ __
4 ___________ __
5 ___________ __
R1 =+0.60000/
R1 =+4.86946f
R; =+0.33332f
R4 =+0.62893f
R; =+0.66990/
Rd =—2.37005f
R7 =+0.21728f
Rs =+0.66498f
Re =+0.45206f
R1o=+4.72522f
l1=0.00080f
d1=0.05812f
l2=0.03492]
cus members spaced by air spaces, the ?rst and second
meniscus members in order from the front to the rear
being positive singlets, the third meniscus member in said
10 order being a diverging doublet consisting of a converg
ing lens element and of a diverging lens element having
cemented interfaces, and the fourth meniscus member
d;=0.14289f
m=l.50378
v3=66.7
being converging and spaced from said third meniscus
d4=0.01298f
m=1.71736
v4=29.5
member an air space greater than each of the air spaces
15 between said ?rst, second, and third meniscus members,
said fourth meniscus member having a rear face concave
to the rear; the radius of curvature of the rear face of said
la=0.2l34lf
ds=0.02584f
m=1.71020
v5=36.5
d@=0.07466f
m=L72825
v¢=28.3
third meniscus member being greater than 0.25 times and
It will be understood that each of the elements de
smaller than 0.5 times the sum of all axial thicknesses
20 of said meniscus members and of all axial air spaces be~
tween said meniscus members; the radius of curvature of
6 ___________ __
scribed above, or two or more together, may also ?nd a
useful application in other types of tele-objectives differ
ing from the types described above.
the front face of said third meniscus member being greater
than 2.5 times and smaller than four times the radius of
curvature of the rear face of said third meniscus mem
While the invention has been illustrated and described 25 ber; the absolute value of the radius of curvature of the
as embodied in a tele-objective of high power of refrac
cemented interfaces of said third meniscus member being
tion having a positive rear member, it is not intended to
greater than eight times the radius of curvature of the
be limited to the details shown, since various modi?cations
rear face of said third meniscus member and smaller than
and structural changes may be made without departing
eight times the radius of curvature of the front face of
in any way from the spirit of the present invention.
30 said third meniscus member; the axial thickness of said
Without further analysis, the foregoing will so fully
fourth meniscus member being greater than the axial
reveal the gist of the present invention that others can by
thickness of said ?rst meniscus member and smaller than
applying current knowledge readily adapt it for various
0.20 times the focal length of the objective as a whole;
applications without omitting features that, from the stand
and the sum of the axial thicknesses of said lens elements
point of prior art, fairly constitute essential characteris 35 of said third meniscus member being greater than 0.10
tics of the generic or speci?c aspects of this invention
times and smaller than 0.20 times the focal length of the
and, therefore, such adaptations should and are intended
objective as a Whole.
to be comprehended within the meaning and range of
3. Photographic tele-objective comprising, four menis
equivalence of the following claims.
cus members spaced by air spaces, the ?rst and second
What is claimed as new and desired to be secured by 40 meniscus members in order from the front to the rear
Letters Patent is:
being positive singlets, the third meniscus member in said
l. Photographic tele-objective comprising, four menis
order being a diverging doublet consisting of a converg
cus members spaced by air spaces, the ?rst and second
ing lens element and of a diverging lens element having
meniscus members in order from the front to the rear
cemented interfaces, and the fourth meniscus member
being positive singlets, the third meniscus member in said
being converging and spaced from said third meniscus
order being a diverging doublet consisting of a converg 45 member an air space greater than each of the air spaces
ing lens element and of a diverging lens element having
between said ?rst, second, and third meniscus members,
cemented interfaces, and the fourth meniscus member
said fourth meniscus member having a rear face concave
being converging and spaced from said third meniscus
member an air space greater than each of the air spaces
to the rear; the radius of curvature of the rear face of
said third meniscus member being greater than 0.25 times
between said ?rst, second, and third meniscus member, 50 and smaller than 0.5 times the sum of all axial thick
said fourth meniscus member having a rear face concave
to the rear; the radius of curvature of the rear face of
nesses of said meniscus members and of all axial air
spaces between said meniscus members; the radius of
said third meniscus member being greater than 0.25 times
curvature of the front face of said third meniscus mem
and smaller than 0.5 times the sum of all axial thick
ber being greater than 2.5 times and smaller than four
55
nesses of said meniscus members and of all axial air
times the radius of curvature of the rear face of said third
spaces between said meniscus members; the radius of
meniscus member; the absolute value of the radius of
curvature of the front face of said third meniscus mem
curvature of the cemented interfaces of said third me
ber being greater than 2.5 times and smaller than four
niscus member being greater than eight times the radius
times the radius of curvature of the rear face of said third
of curvature of the rear face of said third meniscus mem
meniscus member; the absolute value of the radius of cur 60 ber and smaller than eight times the radius of curvature
vature of the cemented interfaces of said third meniscus
of the front face of said third meniscus member; one
member being greater than eight times the radius of cur
sixth of the sum of the radii of curvature of the front
vature of the rear face of said third meniscus member
faces of said ?rst meniscus member, second meniscus
and smaller than eight times the radius of curvature of
member and fourth meniscus member being greater than
the front face of said third meniscus member; one-sixth of 65 the sum of, and smaller than the di?erence between the
the sum of the radii of curvature of the front faces of said
radius of curvature of the front face of said second me
?rst meniscus member, second meniscus member and
niscus member and 0.05 times the focal length of the
fourth meniscus member being greater than the sum of,
objective as a whole; the axial air space between said
and smaller than the difference between the radius of 70 third meniscus member and said fourth meniscus member
being greater than 0.17 times and smaller than 0.25 times
curvature of the front face of said second meniscus mem
the focal length of the objective as a whole; the axial
ber and 0.05 times the focal length of the objective as a
thickness of said fourth meniscus member being greater
whole; the axial air space between said third meniscus
than the axial thickness of said ?rst meniscus member
member and said fourth meniscus member being greater
than 0.17 times and smaller than 0.25 times the focal 75 and smaller than 0.20 times the focal length of the ob
3,033,081
7
8
times and smaller than 0.20 times the focal length of the
jective as a whole; and the sum of the axial thicknesses
of said lens elements of said third meniscus member being
greater than 0.10 times and smaller than 0.20 times the
focal length of the objective as a whole.
objective as a whole.
6. Photographic tele-objective comprising, four menis~
cus members spaced by air spaces, the ?rst and second
meniscus members in order from the front to the rear
4. Photographic tele-objective comprising, four menis
being positive singlets, the third meniscus member in said
cus members spaced by air spaces, the ?rst and second
meniscus members in order from the front to the rear
order being a diverging doublet consisting of a converg
ing lens element and of a diverging lens element having
being positive singlets, the third meniscus member in said
cemented interfaces, and the fourth meniscus member
order being a diverging doublet consisting of a converging
lens element and of a diverging lens element having ce 10 being a converging doublet consisting of a converging
lens element and of a diverging lens element having ce
mented interfaces, and the fourth meniscus member be
mented interfaces, said fourth meniscus member being
ing a converging doublet consisting of a converging lens
spaced from said third meniscus member an air space
element and of a diverging lens element having cemented
greater than each of the air spaces between said ?rst,
interfaces, said fourth meniscus member being spaced
from said third meniscus member an air space greater 15 second, and third meniscus members, the concave faces
of said lens elements of said fourth meniscus member
than each of the air spaces between said ?rst, second, and
being concave to the rear; the radius of curvature of the
third meniscus members, the concave faces of said lens
rear face of said third meniscus member being greater
elements of said fourth meniscus member being concave
than 0.25 times and smaller than 0.5 times the sum of all
to the rear; the radius of curvature of the rear face of said
third meniscus member being greater than 0.25 times and 20 axial thicknesses of said meniscus members and of all
axial air spaces between said meniscus members; the
smaller than 0.5 times the sum of all axial thicknesses of
radius of curvature of the front face of said third menis
said meniscus members and of all axial air spaces between
cus member being greater than 2.5 times and smaller than
said meniscus members; the radius of curvature of the
four times the radius of curvature of the rear face of said
front face of said third meniscus member being greater
than 2.5 times and smaller than four times the radius of 25 third meniscus member; the absolute value of the radius
of curvature of the cemented interfaces of said third me
curvature of the rear face of said third meniscus member;
niscus member being greater than eight times the radius of
the absolute value of the radius of curvature of the ce
curvature of the rear face of said third meniscus mem
mented interfaces of said third meniscus member being
ber and smaller than eight times the radius of curvature
greater than eight times the radius of curvature of the
of the front face of said third meniscus member; the sum
rear face of said third meniscus member and smaller
of the axial thicknesses of said lens elements of said
than eight times the radius of curvature of the front face
fourth meniscus member being greater than the axial
of said third meniscus member; and the sum of the axial
thickness of said ?rst meniscus member and smaller than
thicknesses of said lens elements of said third meniscus
0.20 times the focal length of the objective as a whole;
member being greater than 0.10 times and smaller than
35 and the sum of the axial thicknesses of said lens elements
0.20 times the focal length of the objective as a whole.
of said third meniscus member being greater than 0.10
5. Photographic tele-objective comprising, four menis
times and smaller than 0.20 times the focal length of the
cus members spaced by air spaces, the ?rst and second
objective as a whole.
meniscus members in order from the front to the rear
7. A photographic tele-objective having an aperture
being positive singlets, the third meniscus member in
said order being a diverging doublet consisting of a con
verging lens element and of a diverging lens element hav
ing cemented interfaces, and the fourth meniscus mem
40 of 1:2, an angle of ?eld of 20° and a rear intercept length
of 0.31813)‘, the objective being constructed substantially
according to the speci?cations in the following table:
ber being a converging doublet consisting of a converging
lens element and of a diverging lens element having ce
mentedinterfaces, said fourth meniscus member being 45
spaced from said third meniscus member an air space
greater than each of the air spaces between said ?rst,
second, and third meniscus members, the concave faces
of said lens elements of said fourth meniscus member
being concave to the rear; the radius of curvature of the
rear face of said third meniscus member being greater
than 0.25 times and smaller than 0.5 times the sum of all
axial thicknesses of said meniscus members and of all
axial air spaces between said meniscus members; the
radius of curvature of the front face of said third menis
cus member being greater than 2.5 times and smaller
than four times the radius of curvature of the rear face
of said third meniscus member; the absolute value of the
radius of curvature of the cemented interfaces of said
third meniscus member being greater than eight times
the radius of curvature of the rear face of said third
Lens
Elements
1 ........... --
2 ___________ __
3 ___________ __
Radtl
R1=+0. 61183]
Rz=+7. 46413]
R|=+0. 34634]
R4=+0. 65803]
Rs=+0. 70437]
Thlcknesses
and Alrspaces
Tln
V
d1=0. 07492]
’Il1=1. 62041
?1=60. 3
“i=1. 62041
"=60. 3
da=0. 14808]
m=1. 51009
9:=63. 4
d|=0. 01339]
m=l. 72825
“=28. 3
ds=0. 02677]
m=l. 72340
“=38. 0
dt=0. 08923]
m=1. 72825
v;=28. 3
l1=0. 00085]
d2=1. 51009]
l;=0. 04023]
Ra= —2. 51018]
4 ___________ _.
5 ___________ __
6 ___________ __
R1=+0. 22914]
Rs=+0. 72151]
Ro=+0. 29815]
R1o=+4. 53777]
l3=0. 22123]
wherein the ?rst column lists six lens elements in numerals
in order from the front to the rear; wherein f is the focal
length of the objective, nD is the index of refraction for
member; one-sixth of the sum of the radii of curvature
of the front faces of said ?rst meniscus member, second 65 the D line of the spectrum and v is the dispersive index;
and wherein R, d, and I refer, respectively, to the radii
meniscus member and fourth meniscus member being
of curvature of the refractive faces, the axial thicknesses
greater than the sum of, and smaller than the difference
of the lens elements, and the axial air spaces between the
between the radius of curvature of the front face of said
lens elements, the subscripts on the characters R, d, l,
second meniscus member and 0.05 times the focal length
of the objective as a whole; the axial air space between 70 n and v being numbered consecutively from the front to
the rear, and the plus and minus signs in the second
said third meniscus member and said fourth meniscus
column corresponding to refractive lens faces which are
member being greater than 0.17 times and smaller than
respectively convex and concave to the front.
0.25 times the focal length of the objective as a whole;
8. A photographic tele-objective having an aperture of
and the sum of the axial thicknesses of said lens elements
of said third meniscus member being greater than 0.10 75 1:2, an angle of ?eld of 20° and a rear intercept length of
meniscus member and smaller than eight times the radius
of curvature of the front face of said third meniscus
3,033,081
9
10
0.31813f, the objective being constructed substantially
wherein the ?rst column lists six lens elements in numer
als in order from the front to the rear; wherein f is the
according to the speci?cations in the following table:
focal length of the objective, 11D is the index of refraction
Lens
Elements
Radli
1 ___________ -_
2 ___________ .-
3 ........... _4 ___________ __
5 ........... __
6 ___________ __
for the D line of the spectrum and v is the dispersive
Thicknesses
and Airspaces
R|=+0.61183f
d\=0.07492f
R:=+7.46413f
l|=0.00085f
R:=+0.34634f
dz=0.05623f
Rt=+0.65803/
l:=0.04023f
Ri=+0.70437f
d3=0.l4808[
R.=-2.51o1s/
d4=0.01339f
R1=+0.22914 f
l:=0.22123f
Ra=+0.72151f
d5=0.02677/
Ra=+0.29815[
ds=0.08923f
Rro=+4.53777f
Lens Elements
110
V
m=1.62041
01:60.3
m=l.6204l
|lz=60.3
index; and wherein R, d, and I refer, respectively, to the
radii of curvature of the refractive faces, the axial thick
ness of the lens elements, and the axial air spaces between
the lens elements, the subscripts on the characters R, d,
l, n and v being numbered consecutively from the front
10
to the rear, and the plus and minus signs in the second
column corresponding to refractive lens faces which are
respectively convex and concave to the front.
m=1.5l009
v;=63.4
10. A photographic tele-objective having an aperture
m-l.72825
v4=28.3
of 1:2.8, an angle of ?eld of 30°, and a rear intercept
m=1.72340
vs=38.0
m=1.72825
vs=28.3
length of 0.35485f, the objective being constructed sub
stantially according to the speci?cation in the following
table:
Lens
Elements
Power of Refraction (P1 to Pro)
1 _____________________________________ ..
2 _____________________________________ -_
3 ..................................... ..
4 ..................................... -.
5 _____________________________________ __
6 _____________________________________ __
Surface (R1) P1=+l.0l402/f
(R1) P2=—O.08312/f
(R3) P;=+1.79133/f
(R1) P4=--O.94283/f
(Rs) Ps=+0.72418/f
Surface (Rs) Po=—0.08691/f
Surface (R1) P;=—3.178l9/f
Surface (Rs) Ps=+1.00262/f
Surface (Rt) P9=+0.O1027/f
Surface (Rm) Pio= —0.16049/f
Surface
Surface
Surface
Surface
'
25
1 ........... _-
Radli
R1= +0.60000f
Rz=+4.80946f
Ra=+0.33332f
2 ........... _.
3 ........... __
4 ___________ _ _
5 ........... _.
wherein the ?rst column lists six lens elements in nu
merals in order from the front to the rear; wherein f is
the focal length of the objective, up is the index of re
fraction for the D line of the spectrum and v is the dis
n,
V
dl=0.07225f
m=l.62041
v1=60.3
1iz=1.62041
02:60.3
d3=0.14289f
7L3=L50378
D3=66J
d4 =0.01298I
m = 1 .71736
11:29.5
Airspaces
l\=0.00080f
dz=0.05812f
Rt: +0.62893]
30
Thicknesses
and
Rs= +0.66990f
R6: —2.37005!
R;=+0.21728f
Rg= +0.66498f
Rn= +0.45206f
6 ........... __
lz=0.03492f
l3=0.2l341f
d5==0.02584f
m=1.71020
05:36.5
dr=0.0746?[
m= 1.72825
vg=28.3
Rm=+4.72522f
wherein the ?rst column lists six lens elements in nu
40
merals in order from the front to the rear; wherein f is
to the radii of curvature of the refractive faces, the axial
the focal length of the objective, nD is the index of refrac
thicknesses of the lens elements, and the axial air spaces
tion for the D line of the spectrum and v is the dispersive
between the lens elements, the subscripts on the charac
ters R, d, l, n and v being numbered consecutively from
index; and wherein R, d, and I refer, respectively, to the
the front to the rear, and the plus and minus signs in 45 radii of curvature of the refractive faces, the axial thick
the second column corresponding to refractive lens faces
nesses of the lens elements, and the axial air spaces be
which are respectively convex and concave to the front.
tween the lens elements, the subscripts on the characters
9. A photographic tele-objective having an aperture
R, d, l, n and v being numbered consecutively from the
of 1:2:8, an angle of ?eld of 30°, and a rear intercept
front to the rear, and the plus and minus signs in the
length of 0.34522f, the objective being constructed sub 50 second column corresponding to refractive lens faces
persive index; and wherein R, d, and I refer, respectively,
stantially according to the speci?cations in the following
table:
which are respectively convex and concave to the front.
References Cited in the ?le of this patent
Lens
Elements
Thicknesses
Radii
and Airspaces
n,,
Rr=+0.60920f
1 ........... ..
9
R1= 5.99 59
+
88
R4= 0.63 l
+
I
R,=+0.es151f
3 ___________ __
R1- 0.22177
5 ___________ ..
+
I
R,=+0.69730/
R|=+0.36838f
6 ___________ __
R|o=+6.24337/
1914
1933
1937
1939
1939
65
2,350,035
2,767,614
2,803,167
2,913,956
Herzberger __________ .._ May
Altman ______________ .._ Oct.
Kohler et a1. _________ .. Aug.
Solish _______________ -._ Nov.
1944
1956
1957
1959
70
696,167
719,677
114 = 1 .62041
vr=60.3
d1=0.05438f
60
m=l .62041
l1=0.03891f
d;=0.l4321f
m=l.51009
d4=0.01294f
n4=1.72825
Rr= —2.42845f
4 ___________ ._
2,184,018
Konig ________________ __ Feb. 3,
Berek ________________ __ Mar. 7,
Lee _________________ .._ Nov. 23,
Merte ______________ __ Aug. 29,
Ort _________________ __ Dec. 19,
l1=0.00082f
R:=+0.33517f
2 ___________ __
vs=63.4
v4=28.3
l;=0.21396f
ds=0.02589f
m=1.72340
d.=0.08630f
m=1.72825
UNITED STATES PATENTS
55
m=60.3
d1 =0.07246f
f
V
1,085,868
1,899,934
2,100,291
2,171,274
v;=38.0
m=28.3
30,
23,
20,
24,
FOREIGN PATENTS
Great Britain ________ -._ Aug. 26, 1953
Germany ____________ __ Apr. 18, 1942
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