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A slide viewer is usually a small handheld device with a slot in which a slide can be inserted to see a magnified illuminated view of it. A slide viewer is an instrument for individual viewing. Some models have an automatic feeder for inserting multiple slides and some have a slot for a strip of film.
It is used by photography professionals viewing transparent films, such as slides. [2] This device was originally used to sort photographic plates with ease. When laid flat, it may be called a light table. Generally, a lightbox uses light similar to daylight (5,000–6,000 kelvins (K)) and has uniform light strength on the glass pane. [3]
Stereo Realist Red Button viewer with slides. The Realist uses standard 135 film.The unusual proportions of the slides (the image was 5 sprockets wide [5]) became the standard for 3-D slides, and is known as "5P" or "Realist Format".
A single slide, showing a color transparency in a plastic frame Slide projector, showing the lens and a typical double slide carrier. In photography, reversal film or slide film is a type of photographic film that produces a positive image on a transparent base. [1]
Transparencies can be reviewed with the aid of a magnifying loupe and a lightbox. If mounted in small metal, plastic or cardboard frames for use in a slide projector or slide viewer they are commonly called slides. Reversal film is often marketed as "slide film".
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 Photographic film slides and projectors have been replaced by image files on digital storage media shown on a projection screen by using a video projector , or displayed on a large-screen video monitor .
The View-Master was marketed through Mayer's photo-finishing, postcard and greeting card company Sawyer's Service, Inc., known eventually as Sawyer's, Inc. The partnership led to the retail sales of View-Master viewers and reels. The patent for the viewing device was issued in 1940, and this original model came to be called the Model A viewer.
It used 35mm slide film to produce stereo pair images in the standard 5P Realist format. This allowed Kodak Stereo Camera owners to use most accessories and services originally designed for the Stereo Realist. It was the second best selling stereo camera of the 1950s era, eclipsed only by the Stereo Realist.
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