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System through which the photographer looks to compose and focus the picture / From Wikipedia, the free encyclopedia

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In photography, a viewfinder is what the photographer looks through to compose, and, in many cases, to focus the picture. Most viewfinders are separate, and suffer parallax, while the single-lens reflex camera lets the viewfinder use the main optical system. Viewfinders are used in many cameras of different types: still and movie, film, analog and digital. A zoom camera usually zooms its finder in sync with its lens, one exception being rangefinder cameras.

Built-in viewfinder of a Nikon D90
Viewfinder of a Nikon ZOOM 300 AF (35mm film) camera