Without light there can be no photography and the quality of that light is probably the single most important factor affecting the image. In the main the light we use for photography is visible so that what the eye sees is what the film will record. However, film is sensitive to light beyond the visible spectrum, particularly in the ultraviolet range, and this will affect the image without us knowing precisely to what extent. The direction and strength of the light will alter the appearance of our subject, both physically and aesthetically. To understand its effect fully we must first understand some basic principles.
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