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‘Exposure’ Exposure is the basic process through which a photograph is taken. It is the exposing the light sensitive film to light, therefor burning an image to be developed. The ability to create the perfect exposure, is the ability to control the light exposure to the film. How the photograph turns out is controlled by several factors, i.e., the intensity of the light; the sensitivity of the film; and the duration for which the film is exposed to the light. These factors all relate to each other, and thus determine if the film will be too bright, to dark, over or under-exposed. ISO(ASA) The first of these settings is ASA or ISO. This is the speed of the film and determines its sensitivity. For proper exposure, the ASA should always be set to the speed of the film that you are using, e.g., 400 (standard). ASA stands for American Standards Authority, and ISO stands for International Standards Organisation. Th