Camera Geometry And Light

A geometric relationship exists between the lens focal length, image format, area (angle) of view, and the amount of light that reaches the film or electronic sensor. Some common lens focal lengths are given in Table 6-2. Many cameras are now equipped with zoom lenses that allow the user to vary the focal length. The lens aperture and shutter speed are fundamental controls for how much light reaches the film or image sensor. Film speed or ISO rating determines how much light is required for correct exposure of the photographic emulsion or detector elements. Each of these factors is examined in turn.

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Champion Flash Photography

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