- published: 02 Jul 2007
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A slide projector is an opto-mechanical device for showing photographic slides.
35 mm slide projectors, direct descendants of the larger-format magic lantern, first came into widespread use during the 1950s as a form of occasional home entertainment; family members and friends would gather to view slide shows, which typically consisted of slides snapped during vacations and at family events. Slide projectors were also widely used in educational and other institutional settings.
Photographic film slides and projectors have mostly been replaced by image files on digital storage media shown on a projection screen by using a video projector or simply displayed on a large-screen video monitor.
A projector has four main elements:
A flat piece of heat-absorbing glass is often placed in the light path between the condensing lens and the slide, to avoid damaging the latter. This glass transmits visible wavelengths but absorbs infrared. Light passes through the transparent slide and lens, and the resulting image is enlarged and projected onto a perpendicular flat screen so the audience can view its reflection. Alternatively, the image may be projected onto a translucent "rear projection" screen, often used for continuous automatic display for close viewing. This form of projection also avoids the audience interrupting the light stream by casting their shadows on the projection or by bumping into the projector.
Make a slide projector using commonly available materials
The Slide Projector - S1XE03 - Il proiettore
Kodak Carousel 5600 slide projector
1976 GAF 35mm Slide Projector #1680
[5.4] Formation of images in slide projector
Making a slide projector
The Slide Projector - Webserie - Scuse - Pilot
Kodak Carousel 750H Slide Projector
The Slide Projector - S1XE2 - Passaggio Segreto
Slide Projector