Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Photonics Dictionary


An instrument for determining the sensitivity of a photographic film to light. The film is given either a stepped exposure or a continuously varied exposure; after processing, the density is measured with a densitometer and the H and D curve is plotted. From this, the film speed, gamma, etc., can be determined. Sensitometers are of two types: those in which the illumination is varied with a constant exposure time, and those in which the time is varied with a constant illumination. Most films show some degree of reciprocity failure for exposures at extremely short or extremely long exposure times, even though the product of time and illumination is held constant.
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x We deliver – right to your inbox. Subscribe FREE to our newsletters.