Slide projector
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A slide projector is an opto-mechanical device to view photographic slides. It has four main elements: a fan-cooled electric incandescent light bulb or other light source, a reflector and "condensing" lens to direct the light to the slide, a holder for the slide and a focusing lens. 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 shadow on the projection or by bumping 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In-home photographic slides and slide projectors have largely been replaced by low cost paper prints, digital cameras, DVD media, video display monitors and video projectors.
As of October 2004, Eastman Kodak no longer manufactures slide projectors. It is also increasingly difficult in some countries to locate photo processors who will process slide film.[citation needed]
[edit] Types of projector
- Carousel slide projectors (includes tray-style projectors)
- Dual slide projectors
- Overhead projectors
- Single slide projectors (manual form)
- Viewer slide projectors
- Slide Cube projectors
- Stereo slide projectors (projects two slides simultaneously with different polarizations; slides appear as three-dimensional with polarizing glasses)
- Large Format Slide Projector for uses on stages, for events or for architectural and advertising issues of high light output needs.
[edit] See also
[edit] External links
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