Editing Slide projector (section)

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{{Short description|Opto-mechanical device for showing photographic slides}}
[[File:Projecteur de diapositives Prestinox début des années 1960.jpg|thumb|A 1960 slide projector]]

A '''slide projector''' is an optical device for [[Projector|projecting]] enlarged images of [[photography|photographic]] slides onto a [[Projection screen|screen]]. Many projectors have mechanical arrangements to show a series  of slides loaded into a special tray sequentially.

[[135 film|35&nbsp;mm]] slide projectors, direct descendants of the larger-format [[magic lantern]], first came into widespread use during the 1950s for [[slide show]]s as home entertainment, and for use by educational and other institutes. [[Reversal film]] created a small positive projectable image rather than the [[Negative (photography)|negatives]] used since the early days of photography; photography now produced 35mm directly viewable small colour slides, rather than large monochrome negatives. The slide images were too small for unaided viewing, and required enlargement by a projector or enlarging viewer.

Photographic film slides and projectors have been replaced by [[image file]]s on [[digital storage media]] shown on a projection screen by using a [[video projector]], or displayed on a large-screen video [[Computer monitor|monitor]].