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The small window in the camera that you look through when taking a picture.
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The variation in viewpoint of a camera's optical viewfinder and that of the taking lens. This increases as you go closer to the subject.
A multi sided glass prism housed in the roof of an single-lens reflex camera so that the image that's seen be the lens can be viewed through an optical viewfinder above the lens. The light enters through the lens is reflected up by a reflex mirror to the prism and across to the eye.