Chapter 2
Camera and Printing Exposure
Photograph by David Kelbe, Imaging Science Student, Rochester Institute of Technology
Camera Exposure Versus Photographic Exposure
Although the terms camera exposure and photographic exposure are related, they are not the same. The term camera exposure refers to the combination of shutter speed and ƒ-number used to expose an image. Photographic exposure is defined as the quantity of light per unit area received by the film, photosensitive material, or digital sensor, and it is calculated by multiplying the illuminance (H) and the exposure time (t). The relationship is commonly expressed as H = E × t.
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