Pentaprism- Is used in Sinlge-lens cameras especially to reverse images and reflect them to the viewfinder.
Parallax- the difference between the view of an object as seen through the picture-taking lens of a camera and the view as seen through a separate viewfinder.
Pixel- the smallest element of an image that can be individually processed in a video display system.
Focusing- the position of a viewed object or the adjustment of an optical device necessary to produce a clear image.
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