New configuration of a lens for a 35-mm cinema projector

Manoj K. Mittal; B. N. Gupta; K. D. Sharma

doi:10.1364/AO.29.002446

Applied Optics
Vol. 29,
Issue 16,
pp. 2446-2450
(1990)
•https://doi.org/10.1364/AO.29.002446

New configuration of a lens for a 35-mm cinema projector

Manoj K. Mittal, B. N. Gupta, and K. D. Sharma

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Manoj K. Mittal, B. N. Gupta, and K. D. Sharma, "New configuration of a lens for a 35-mm cinema projector," Appl. Opt. 29, 2446-2450 (1990)

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Abstract

A new lens system configuration having seven uncemented elements made of Indian optical glasses has been developed. It has focal length of 75 mm, relative aperture of f/1.4 and is to be used in a 35-mm cinema projector objective. To compare the performance of this lens system, a commonly used design of seven uncemented elements based on double-Gauss configuration was also developed. The performance of the designs was evaluated by plotting aberration curves, energy distribution curves, and the geometrical MTF curves. The proposed new configuration gives better performance compared with the double-Gauss configuration being used currently.

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Surface No.	Radius of curvature (r)	Clear aperture (D)	Thickness/(separation) (d)	Refractive index (nd)	Abbe value (V)
(1)	204.08	28.82	14.18	1.6103	57.3
(2)	−820.34	27.35	(2.55)	1.0000	—
(3)	41.30	25.03	8.66	1.6103	57.3
(4)	155.47	24.32	(7.25)	1.0000	—
(5)	−107.78	23.04	3.79	1.6535	33.5
(6)	38.53	21.11	(6.98)	1.0000	—
(7)	STOP	21.24	(17.73)	1.0000	—
(8)	97.65	25.12	13.40	1.6103	57.3
(9)	−57.25	25.15	(0.30)	1.0000	—
(10)	46.76	21.42	8.18	1.6103	57.3
(11)	−620.35	20.37	(7.17)	1.0000	—
(12)	−109.76	16.92	0.75	1.6205	36.2
(13)	22.55	15.53	(1.07)	1.0000	—
(14)	23.47	16.00	5.89	1.6103	57.3
(15)	60.38	15.74

Surface No.	Radius of curvature (r)	Clear aperture (D)	Thickness/(separation) (d)	Refractive index (nd)	Abbe value (V)
(1)	94.98	28.19	6.50	1.6103	57.3
(2)	668.00	27.66	(0.30)	1.0000	—
(3)	51.66	25.79	4.92	1.6103	57.3
(4)	111.25	25.41	(0.30)	1.0000	—
(5)	38.38	23.26	9.08	1.6103	57.3
(6)	11235.96	22.65	(0.30)	1.0000	—
(7)	2652.52	22.28	13.98	1.7169	29.4
(8)	21.02	13.63	(5.30)	1.0000	—
(9)	Stop	13.56	(3.21)	1.0000	—
(10)	−32.69	13.50	2.34	1.5845	46.9
(11)	42.41	13.79	(0.77)	1.0000	—
(12)	45.27	13.98	11.10	1.6103	57.3
(13)	−39.61	14.36	(1.02)	1.0000	—
(14)	64.60	14.98	3.51	1.6103	57.3
(15)	−152.70	14.99

Surface No.	Field angle (deg)	Resolving power (lines/mm)
(1)	0.0	250
(2)	5.0	84
(3)	7.5	62
(4)	10.0	56

Surface No.	Field angle (deg)	Resolving power (lines/mm)
(1)	0.0	167
(2)	5.0	59
(3)	7.5	46
(4)	10.0	41

Surface No.	Radius of curvature (r)	Clear aperture (D)	Thickness/(separation) (d)	Refractive index (nd)	Abbe value (V)
(1)	204.08	28.82	14.18	1.6103	57.3
(2)	−820.34	27.35	(2.55)	1.0000	—
(3)	41.30	25.03	8.66	1.6103	57.3
(4)	155.47	24.32	(7.25)	1.0000	—
(5)	−107.78	23.04	3.79	1.6535	33.5
(6)	38.53	21.11	(6.98)	1.0000	—
(7)	STOP	21.24	(17.73)	1.0000	—
(8)	97.65	25.12	13.40	1.6103	57.3
(9)	−57.25	25.15	(0.30)	1.0000	—
(10)	46.76	21.42	8.18	1.6103	57.3
(11)	−620.35	20.37	(7.17)	1.0000	—
(12)	−109.76	16.92	0.75	1.6205	36.2
(13)	22.55	15.53	(1.07)	1.0000	—
(14)	23.47	16.00	5.89	1.6103	57.3
(15)	60.38	15.74

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Applied Optics