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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 Photographic film slides and projectors have been replaced by image files on digital storage media shown on a projection screen by using a video projector, or displayed on a large-screen video monitor.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 Slide Cube Projector is a slide projector and system, manufactured and marketed by Bell & Howell, which was introduced in 1970 and marketed through the 1980s.The projector derived its name from its transparent cubical plastic slide storage magazine, approximately 5.5 cm (2.2 in) in each dimension (a bit larger than a standard 135 film slide mount), that held 36 to 44 slides, depending on ...
A slide copier is a simple optical device that can be fastened to the lens mount of a camera to enable slide duplicates to be made. Whilst these devices were formerly used to make duplicates on to slide film , they are often now used in conjunction with digital cameras to digitize images from film-based transparencies.
Such cameras are capable of making high-quality images on 110 film. Some of these cameras are quite small and still hold appeal to subminiature-photography enthusiasts. The small negative size of 110 film makes it difficult to enlarge successfully. For these reasons, the 110 format is associated with prints that are often rather grainy and unsharp.
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".
Therefore, the transparency is placed face up (toward the mirror and focusing lens), in contrast with a 35mm slide projector or film projector (which lack such a mirror) where the slide's image is non-reversed on the side opposite the focusing lens. A related invention for enlarging transparent images is the solar camera.
127 color transparencies can be mounted in standard 2” square slide mounts, and projected in an ordinary 35 mm projector. Because of their much greater area, the projected image is larger and more brilliant than a 35 mm slide, and they are popularly called " Superslides ", a name once reserved for 40 × 40 mm slides cut down from 120 film.
The usual frame size of 35mm still cameras is 24×36 mm, however half-frame cameras typical use an image area of 18×24 mm. One net result of this is that a roll of film can typically contain twice the number of exposures as in a full frame 35mm camera (that is, a roll that is nominally 36 exposures allows 72 in the half-frame format).
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