Abstract

Ground glass used for camera focus screens often has far from optimum diffusion properties. An analysis of the function of the focus screen shows that a screen with random (Gaussian) diffusion properties can be constructed with both brightness and focus efficiencies above 84%. These considerations have led to the design of an unusually bright and effective focus screen for the Polaroid SX-70 Land camera.

© 1975 Optical Society of America

Nonlinear filtering in coherent optical systems through halftone screen processes

Hisatoyo Kato and J. W. Goodman
Appl. Opt. 14(8) 1813-1824 (1975)

Refractive index profile optimization in diffused graded index lenses

W. E. Martin
Appl. Opt. 14(10) 2427-2431 (1975)

Night myopia and the intermediate dark focus of accommodation*

H. W. Leibowitz and D. A. Owens
J. Opt. Soc. Am. 65(10) 1121-1128 (1975)

Unusual optics of the Polaroid SX-70 Land camera

William T. Plummer
Appl. Opt. 21(2) 196-202 (1982)

Diffraction effects with lenticular projection screens

E. W. Marchand
J. Opt. Soc. Am. 65(2) 139-145 (1975)