A testing instrument for camera lenses is described which automatically measures transfer functions and line spread functions provided the focusing plane is maintained. The frequency covers a continuous range of 0 lines/mm to 150 lines/mm. The gauging to 1 with 0 lines/mm of the transfer function is automatic under all f stop, color, and defocusing conditions. The misalignment caused by instrumentation and the measuring principle is compensated by a function potentiometer. The instrument described allows focusing to infinity by collimators and focusing up to 6 m without collimators. Evaluated and measured curves are compared.
A. Bigelmaier, K. D. Schaefer, and H. Wasmund, "An Instrument for Measuring Transfer Functions and Line Spread Functions of Camera Lenses," Appl. Opt. 7, 277-281 (1968)