In simple terms, exposure is the act of pressing the shutter release on the camera and allowing light to fall on the film. In practice it is the result of a number of calculations and operations. The way in which light levels are calculated, the choice of aperture, shutter speed and film all have a direct effect on exposure. Correct exposure is having just the right amount of light reaching the film to give you a negative or transparency of normal density and contrast. It therefore follows that if a film does not receive sufficient light an under exposed image will result; on the other hand one that receives too much light will be over exposed. That is not to say that every image should be given correct exposure; much will depend on artistic interpretation.
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