© Tim Meyer
Exposure refers to the capture of light on the camera’s sensor or film. Factors affecting exposure include the camera’s aperture and shutter speed as well as the speed of the sensor or film. When any one of these three factors remains constant, then the other two variables establish the exposure.
Though many portrait photographers believe they do not need to consider shutter speed because they use electronic flash, there are several situations where the shutter speed is crucial, such as when needing to include an unlighted background.
All photography is based on a 2:1 factor. Doubling the ISO increases the film ...