# Патент USA US3033091

код для вставкиJDU-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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