Variable anamorphic lens for a 35-mm SLR

Ian Powell

doi:10.1364/AO.22.003249

Applied Optics
Vol. 22,
Issue 20,
pp. 3249-3257
(1983)
•https://doi.org/10.1364/AO.22.003249

Variable anamorphic lens for a 35-mm SLR

Ian Powell

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Ian Powell, "Variable anamorphic lens for a 35-mm SLR," Appl. Opt. 22, 3249-3257 (1983)

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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.

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Wedge angle of prism (deg)	Rotation angle (deg)	Anamorphic ratio	Angular chromatic aberration (mrad)

			−10°	0°	10°
5	0	1.00	0.00	0.00	0.00
	−43	0.77	0.79	0.20	0.37
	43	1.30	0.74	0.15	0.42
7	0	1.00	0.00	0.00	0.00
	−37	0.77	0.84	0.22	0.36
	37	1.30	0.78	0.17	0.42
10	0	1.00	0.00	0.00	0.00
	−30	0.78	0.87	0.26	0.34
	30	1.29	0.80	0.19	0.42
15	0	1.00	0.00	0.00	0.00
	−22	0.78	0.91	0.31	0.29
	22	1.28	0.82	0.21	0.39
20	0	1.00	0.00	0.00	0.00
	−17	0.78	0.98	0.37	0.22
	17	1.28	0.86	0.25	0.35
10 modified	0	1.00	0.20	0.21	0.21
	−30	0.78	0.64	0.02	0.67
(V values of 55 and 60)	30	1.27	1.06	0.42	0.20

Arrangement	Rotation angle (deg)	Anamorphic ratio	Angular chromatic aberration (mrad)

			−10°	0°	10°
Asymmetrical	0	1.00	0.11	0.03	0.17
	−32	0.77	0.28	0.01	0.28
	32	1.32	0.24	0.01	0.23
Symmetrical	0	1.00	0.00	0.00	0.00
	−32	0.76	0.67	0.64	0.69
	32	1.31	0.52	0.49	0.54

Wedge angle of prism (deg)	Rotation angle (deg)	Anamorphic ratio	Angular chromatic aberration (mrad)

			−10°	0°	10°
5	0	1.00	0.00	0.00	0.00
	−43	0.77	0.79	0.20	0.37
	43	1.30	0.74	0.15	0.42
7	0	1.00	0.00	0.00	0.00
	−37	0.77	0.84	0.22	0.36
	37	1.30	0.78	0.17	0.42
10	0	1.00	0.00	0.00	0.00
	−30	0.78	0.87	0.26	0.34
	30	1.29	0.80	0.19	0.42
15	0	1.00	0.00	0.00	0.00
	−22	0.78	0.91	0.31	0.29
	22	1.28	0.82	0.21	0.39
20	0	1.00	0.00	0.00	0.00
	−17	0.78	0.98	0.37	0.22
	17	1.28	0.86	0.25	0.35
10 modified	0	1.00	0.20	0.21	0.21
	−30	0.78	0.64	0.02	0.67
(V values of 55 and 60)	30	1.27	1.06	0.42	0.20

Arrangement	Rotation angle (deg)	Anamorphic ratio	Angular chromatic aberration (mrad)

			−10°	0°	10°
Asymmetrical	0	1.00	0.11	0.03	0.17
	−32	0.77	0.28	0.01	0.28
	32	1.32	0.24	0.01	0.23
Symmetrical	0	1.00	0.00	0.00	0.00
	−32	0.76	0.67	0.64	0.69
	32	1.31	0.52	0.49	0.54

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Equations (8)

Applied Optics