Slide projector
A slide projector is used to view photographic slides by using optical and mechanical methods. It contains an electric light bulb, focusing lenses. reflector and condensing lenses and a holder that holds the slide.
A flat piece of heat absorbing glass is often placed between the condensing lens and the slide, to avoid damaging the slide. This glass absorbs infrared. Light passes through the transparent slide and lens, and the resulting image is enlarged and projected onto a screen. So the audience can view its reflection.
The image may be projected onto a translucent "rear projection" screen. That is used for continuous automatic display for close viewing. This form of projection also avoids that people who look at the show interrupt the light stream or bump into the projector.
Slide projectors were common in the 1950s and 1960s as a form of entertainment; family members and friends would gather to view slideshows.
In-home photographic slides and slide projectors have largely been replaced by low cost paper prints, digital cameras, DVD media, video display monitors and digital projectors.
As of October 2004, Kodak no longer manufactures slide projectors. It is also increasingly difficult in some countries to locate photo processors who will process slide film.
Slide Projector Media
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Slide projector light generation and collimation system: from left to right, mirror / reflector, bulb, condenser lens 1, green-tinted heat-absorbing glass, condenser lens 2; a centrifugal fan, used to cool the bulb, is visible at the top of the picture.
Philips halogen lamp used in Carl Braun Camera-Werk Novamat M 330 slide projector
This slide projector, sold under the Zeiss Ikon brand, uses a straight-through tray; a thin arm grabs slides from a tray and puts them into the light path; the tray is advanced along its length. At the front of the projector, the protruding projection lens features rings to control focal length and focus.
Kodak Carousel S-AV 1050, which features a horizontal rotary slide tray
Continuous-Slide Lantern, c. 1881
A Kodak Carousel model 4400 slide projector, first sold in the mid-1980s
Self-contained slide projector with rear-projection screen and carousel tray
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Other websites
- Kodak: Slide projectors family Archived 2006-04-05 at the Wayback Machine