The Photometric Calibration of Lens Apertures
An absolute and physically sound method developed at Bausch & Lomb is described for the photometric calibration of lens apertures. — Essentially the method consists in comparing the total flux from a depolished opal glass aperture with the flux through a given lens at a definite stop opening when focused on the opal glass aperture. An integrating sphere is used to collect the flux in the two cases and readings are made proportional to the flux with two matched barrier layer photocells. The theoretical development and some numerical results are given.
- Print ISSN
- 0097-5834
- Published
- 1946-08
- Content type
- Original Research
- DOI
- 10.5594/J12796
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