A sensitometer is an instrument used to give a photographic emulsion a series of controlled exposures to light, allowing precise measurement of its sensitivity and response. The light’s spectral quality, intensity, and duration can all be carefully regulated. Depending on the type of exposure variation, the instrument may be referred to as an intensity scale or time scale sensitometer.
Sensitometers are essential tools in film and photographic material testing, helping photographers, labs, and manufacturers evaluate the performance of emulsions under consistent and repeatable conditions. By understanding how an emulsion reacts to light, professionals can ensure optimal exposure, image quality, and consistency in photographic results.