Abstract

A total of 5000 photographic exposures of small targets of various contrasts have been made for the purpose of determining the smallest images which can reliably be detected in a standard film reader. In the majority of cases the liminal image size lay between 10⁻⁴ and 10⁻³ in. The study indicates that uncorrected predictions made on the basis of ordinary visual contrast discrimination data may be in error by an order of magnitude.

© 1959 Optical Society of America

Direct Measures of the Retinal Image*

Donald W. DeMott
J. Opt. Soc. Am. 49(6) 571-579 (1959)

Detail Rendition by Photographic Systems as a Function of Exposure Time*

Robert N. Wolfe
J. Opt. Soc. Am. 49(2) 172-175 (1959)

Quantum Efficiency of Human Vision

R. Clark Jones
J. Opt. Soc. Am. 49(7) 645-653 (1959)

Brightness of Fine Detail in Ground Photography

P. D. Carman and H. Brown
J. Opt. Soc. Am. 49(6) 629-636 (1959)

Optical Analog Computers

Barton J. Howell
J. Opt. Soc. Am. 49(10) 1012-1021 (1959)