Abstract

A variable anamorphic lens system for a 35-mm SLR camera is described. Using a pair of achromatic prisms an anamorphic range of 0.75:1.33 is achieved. The lens in its unanamorphic state has a focal length of 100 mm and an aperture of f/5.6. Focusing from infinity to 0.1 magnification is made possible by separating out the positive and negative components of the nominally zero power front group.

© 1983 Optical Society of America

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References

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  1. H. H. Hopkins, M. J. Yzuel, Opt. Acta 17, 157 (1970).
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1970 (1)

H. H. Hopkins, M. J. Yzuel, Opt. Acta 17, 157 (1970).
[CrossRef]

Hopkins, H. H.

H. H. Hopkins, M. J. Yzuel, Opt. Acta 17, 157 (1970).
[CrossRef]

Yzuel, M. J.

H. H. Hopkins, M. J. Yzuel, Opt. Acta 17, 157 (1970).
[CrossRef]

Opt. Acta (1)

H. H. Hopkins, M. J. Yzuel, Opt. Acta 17, 157 (1970).
[CrossRef]

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Figures (13)

Fig. 1
Fig. 1

Schematic of a possible design for an anamorphic system.

Fig. 2
Fig. 2

Prismatic anamorphic arrangement for (a) M = 1.00, (b) M = 0.75, and (c) M = 1.33, respectively.

Fig. 3
Fig. 3

Achromatic prism assembly for an anamorphic ratio of 1.0.

Fig. 4
Fig. 4

Optimized rear group design.

Fig. 5
Fig. 5

Aberration curves associated with rear group design.

Fig. 6
Fig. 6

Optimum design for the two-element front focusing group: (a) infinite object conjugate; (b) magnification of −0.1.

Fig. 7
Fig. 7

Aberration curves associated with the two-element front focusing group: (a) infinite object conjugate; (b) magnification of −0.1.

Fig. 8
Fig. 8

Optimized two-doublet system for front focusing group.

Fig. 9
Fig. 9

Final design of the variable anamorphic lens for the infinite object conjugate setting.

Fig. 10
Fig. 10

Aberration curves associated with different configurations: (a), (b), (c), and (d) are for an infinite object conjugate with (a) being associated with field points 0, 14, and 20 mm in the horizontal section and (b), (c), and (d) field points 0, 8.4, and 12 mm in the vertical section. Anamorphic ratios for (b), (c), and (d) are 0.75, 1.00, and 1.33, respectively.

Fig. 11
Fig. 11

MTF curves corresponding to the aberration curves appearing in Fig. 10.

Fig. 12
Fig. 12

Variable anamorphic lens.

Fig. 13
Fig. 13

Photographs taken with the variable anamorphic lens. Unity and extreme anamorphic configurations for (a) close and (b) distant focus settings.

Tables (2)

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Table I Angular Chromatic Aberration as a Function of Prism Wedge Angle

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Table II Angular Chromatic Aberration for the Asymmetrical and Symmetrical Arrangements

Equations (8)

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K = K 1 + K 2 d K 1 K 2 .
H S = n sin α λ ρ S ξ , H T = n sin α λ ρ T η ,
G S = nh λ ρ S θ S , H T = nh λ ρ T θ T ,
W C F = ½ n sin 2 z C F ,
z C F = 0.135 W C F .
η C F = 0.024 mm .
W C F = n sin α η C F ,
η C F = 0.012 mm .

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