DE1772784B - Pancratic telephoto lens - Google Patents

Description

fm = 113.2 // M ₁ = 122.24 ' Γ
, / ~ * 80.2 to 201.2 288.150 R _x : 99.826 815.033 Äi = = -307.266 -35.890 Λ ₈ = 109.370 40.129 / i - 97.5 R ₁ = -125.814 - -36.473 103,308 R. = 82.459 A ₇ = -97.968 Ra - 81.005 / ι = -32.5 ■ R _t r = -1 350.662 Λ ₁₀ = 34.195 = -100.438 48.875 / ■ = 87.2 \ * 13 = 103.719 AM = -63,518 A ₁₈ = = -29.514 ^ ₁₆ = 42.105 ^ ₁₇ = = OO * »· 62,484 R ₁ ^ = -275.045 A ₂₀ = Back focus = 48 / J ₂₁ = A ₂ = Λ «=

The invention relates to a compact pancratic telephoto lens that - from the object side from a first, collecting group of effects, a second, dispersing lens group, a third, collecting impact group and a downstream, from a front group and a rear group built-up lens system with a fixed focal length. The focal length will Hiirr.h axial shifting of the second effect

group, in conjunction with a correction of the resulting shift in the image position by means of a shift the third impact group varies. The first action group is made up of one by cementing collecting member made of positive and negative lenses behind a positive single lens, the The second group of effects consists of one produced by cementing positive and negative lenses Disruption link in front of a negative single

lens, the third effect group consists, according to which the front group of the downstream lens system desired Achromatisierungsgrad from a positive M _{1, 2} n is the refractive index of the positive and negative single lens or a converging lens component, tive lens of the converging cemented component of Vorderdie front group of Lens system with a fixed in-house group of the downstream lens system, fm the focal length consists of two members with three lenses 5 focal length of the entire downstream lens group and its rear group of four lenses in three glazing systems and R _a , Rb the radius of curvature of the dem, namely one converging, a diffusing front or rear surface of the last positive lens end and a converging limb. of the downstream lens system.

The object of the invention is to provide a pancratic The condition (1) is the basic condition for

Telephoto lens with the system structure described above io reduction of astigmatism and spherical to provide excellent properties in aberration of the pancratic system has the entire focal length range and has been created very much, while at the same time the downstream compact is. tete lens system remains very compact.

According to the invention, this object is achieved by the fact that if fm _x in condition (la) is greater than 1.1 fm,

the claims characterized objectives solved. When designing a pancratic telephoto lens system, the total length of the downstream lens system becomes too great, and as a result, that for a still camera it is required that the total length D of the whole system be greater than the whole system as compact and light as possible maximum Focal length f _lt whereby the invention should be achieved. Here it is a necessary goal to no longer be achieved. If / m, smaller than the factor, the pancratic subsystem becomes miniaturized 20 0.8 fm, then the downstream lens system will size in order to make the whole system compact. Even a system with a very small telephoto, generally speaking, makes the ratio smaller, and the correction of aberration becomes very difficult and impractical to increase the pancratic subsystem.
Aberrations so that the correction of the astigmalis becomes H ₂ - / ?, in condition (Ib) less than 0.1,

nius and the chiomatic as well as the spherical 25 so the correction of the astigmatism is still difficult-aberration requires a lot of effort. rig even if the condition (1 a) be increased

For the lens system with a fixed focal length, should. Only if the Bedindas are fulfilled at the same time The increase in the pancreatic divisions (la) and (Ib) can result in a minimal abenation system To compensate for the generated astigmatism, corrosion can be expected.

and has small spherical aberration, could be a 30 The upper limit of condition (1b) is not on Petzval-type system can be used, d. H. the limit of the difference in the refractive index the optical glass developed by Joseph Petzval himself. It's impossible that jective that the Petzval condition just does not meet the difference in the refractive index above that and has a positive Petzval sum. To get such of the usual optical glass, since then However, after it has been adapted, the system tends to deteriorate the spherical aberration Total length of the system compared to the burn- the result is.

to increase width. It is therefore in view of the condition (2) prevents the distortion

Demand to make the whole system compact, not suitable on the side of the shorter burning time, to become negative. In the present case, therefore, this condition is used to maintain a compact lens system, a modified 40 of the image error compensation in both endings intermediate glyph for the downstream lens system of the focal point change area. In other words, the one used between a Petzval lens and words, if R _c , -00 or negative, so will that of a telephoto lens. It has a positive Petzval distortion on the side of the shorter focal length sum, which is sufficient to increase the Petzval- to strongly negative, and the difference between this sum in the negative direction as a result of the miniature 45 and the distortion on the longer side to compensate for the adjustment of the Vario attachment. Focal length is getting too big. On the other hand, will /? _G smaller

According to the invention, if the maximum than 10 | / ₂ 1, the distortion on the focal length side of the entire system can be set equal to /, while the shorter focal length will be prevented and if the total length including the one to become negative, but it will be difficult to set the cutout width equal to D. becomes, the condition 50 equal to the aberration on the shorter side and D </, can be obtained, and it is possible to keep a very long focal length. Therefore, a compact and light pancratic telephoto lens R _{t must be obtained} in the Bezu defined by condition (2), which has good properties and is rich.

which the aberrations are excellently corrected. Condition (3) is used to overcome the

The objectives according to the invention have the following positive distortion, which arises when from green

based on general design considerations: the shortening of the downstream lens

systems, the rear limb (Ä _M , A ₁₇ , K ₁₈ ) of the front group is bent through convex to the object in order to be able to keep ^{the flatness of the image at 6} _{° even if the downstream lens system requires an} angle of view of more than 20 ° capture. In other words, it is possible to correct the distortion with the aid of the condition (3 without disturbing the equilibrium of the other lenses.

kungsgruppe, f _{t is} the focal length of the second effect The condition (4) is the basic relationship between c

group, Ä _e the radius of curvature of the first surface to the pancratic system and that of the second group of action, Jm ₁ the focal length of the lens system of fixed dimensions. we

0.8 fm </ hi, <U / m (la) 0.49> M ₂ - / ι, > 0, l (Ib) /? "> 0 and 10 I / ₈ 1 <Λ _β <oo (2) I Ra I <I Al. I. (3) 0.7 <Ulfm < 1.8 (4)

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filfm smaller than 0.7, the pancratic system becomes too small and the correction of the aberration becomes too difficult and impractical. On the other hand , if / Jfin is less than 1.8, the correction of the aberrations can be easily carried out. However, the size of the entire system then becomes too large and this in turn is impractical with regard to the image cameras, since, in particular, easy handling is required here.

As can be seen from the above explanations, with the conditions (1) to (4), the total length D becomes smaller than the maximum focal length / ,, it is therefore possible to realize a compact pancratic telephoto lens with good properties.

The objective designed according to claim 1 is shown in the drawing. It shows

F i g. 1 a longitudinal center section through the pancratic Lens according to claim 1 for a still camera and

F i g. 2 the correction status for the smallest, one medium and the largest focal length of the lens: according to FIG. 1.

According to the invention, a pancratic high quality telephoto lens is obtained that is very compact and unc is corrected excellently. The lens of the invention can not only be used for still cameras, but also z. B. can also be used for motion picture cameras or projectors and for printers.

1 sheet of drawings

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Claims (1)

Patent claims: 1, Pancratic telephoto lens that - from the Seen from the object side - from a first, collecting impact group, a second, scattering impact group, a third, collecting impact group and a downstream group consisting of a front group and a rear group group-built lens system of fixed Eigc focal length, where the focal length dur axial displacement of the second action group] in conjunction with a correction of the hierdui generated image position shift by a V shift of the third action group varii is characterized by followers Data: fx = 121.0 R ₁ « Λ = -40.3 Λ _β = / a = 108.3 ι = 113.1 / w, = 117.8 R ₁₁ = 80 to 200.3 di F / 4.5 Total length = V ₁ = 60.3 = 195.31 / = Ä, - A ₇ = R _lt = 123,951 German maximum focal length = 200.3 = 5.0 ■ Rs = A ₈ = /? is = -381.170 d, π, = 1.62041 V ₁ = 56.3 R _t = = 0.1 Λ ₄ = Ru = 135.630 di V ₈ = 27.5 A ₁ O = = 7.3 Λ * = Ru - -156,000 d, / ι, = 1.61375 = 2.0 «1« = 357,369 d% / I ₈ = 1.75520 V ₄ = 31.1 = 1.33 A ₁₇ = 10,000,000 d-, to 39.58 V ₈ = 69.6 = 3.7 «18 = -44,550 / I ₄ = 1.68893 d. = 1.0 v # = 60.3 49.824 = 4.4 / I ₅ = 1.51728 -45.250 «Ίο = 1.2 149.585 you / i, = 1.62041 V7 = 60.3 = 39.40 121,500 d _lt up to 1.04 V ₈ = 36.3 = 4.0 -51.315 there / i, = 1.62041 = 1.0 -148.009 you « ₈ = 1.62004 v. = 45.9 = 10.88 80,803 you to 10.99 «I. = = 4.7 -1 347.294 di » n _a = 1.54814 V ₁₀ = 48.9 ^ 20 = = 0.7 32,600 dn V _n = 26.1 /? ₂₁ = = 10.4 -222.200 di β n ₁₀ = 1.53172 /? 28 = = 2.8 44.818 di. B ₁₁ = 1.78470 v « = 64.2 23 - = 38.1 Ra - 103.461 dft = 3.8 A ₂₅ = -63,360 d » / i "= 1.51680 V] ₃ = 44.9 = 3.0 -31.220 d _n »• m = 30.0 j = 1.5 40,000 / I ₁₃ = 1.74400 d _{% A} = 4.9 V ₁₅ = 41.1 = 0.1 H ₁₄ = 1.69895 62,328 - 4.0 -2 085.243 / I ₁₆ ^ 1.70154 Back focal length 40.0 2, lens according to the preamble of claim 1, characterized by the following data: / 7/5, 6 total length - 182.02 maximum focal length == 201.2 </, - 4.01 / i, - 1.62041 v, - 60.3 d _t = 0.08 </. = 5.93 / ι »= 1.61375 ν, = 56.3 (Z ₄ = 1.60 / J ₈ = 1.75520 V ₃ = 27.5 </ ₆ = 0.87 to 31.68 </, = 3.01 / I ₄ = 1.68893 V ₄ = 31.1 <Z ₇ = 0.80 / I ₅ = 1.51728 v _s «= 69.6 <Z ₈ = 3.51 <Z, = 1.00 / I ₆ == 1.62041 v, = 60.3 d _l0 = 31.81 to 0.82 d _n = 4.01 / I ₇ = 1.51680 v ₇ = 64.2 d _u = 8.69 to 8.87 d ₁₃ = 4.73 / J ₈ = 1.54814 V ₈ = 45.9 du = 0.72 d _u = 10.43 n _e == 1.54771 v, = 62.9 d _ie = 2.81 / J ₁₀ = 1.78470 V ₁₀ = 26.1 d ₁₇ = 37.69 d _lt = 3.81 / I ₁₁ = 1.51118 v "= 50.9 d ₁₉ = 3.01 t / ₂₀ = 1.52 / i _w = 1.74400 v ₁₂ = 44.9 </ ₂ , = 4.89 / J ₁₃ = 1.69895 v " = 30.0 </ "= 0.08 CZ ₂₃ = 4.01 / I ₁₄ = 1.70154 V ₁₄ = 41.1