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Even with the ubiquitous existence of high-tech equipment like laptops and LCD projectors which can be typically found in conferences and office meeting rooms nowadays, the former (old) technology used for displays and lectures, overhead slide projectors remain as a favorite device for a lot of and we can still find its presence and it is normal in a number of places.

Manufacturers of these kinds of projectors are always upgrading and improving this system to produce the very best performance and satisfaction, this indicates that this simple projection technology is going to stay. An overhead projector is principally a slide projector, a slide that is a plastic clear sheet (also known as transparencies) is used to draw, write as well as print the subject matter to be presented.

When these transparent sheets are put over the projector, the content is projected on to a screen or surface large enough to suit the spectators. They are quite simple and easy to work with; the most common variety of of overhead projector consists of a light box in addition to a reflector, the light box is made of a light, a cooling fan as well as a double faced Fresnel lens that also acts as a cover of the box. The reflector that's mounted on an adjustable arm is created with a mirror and a lens to target and redirect the light.

When the slides or transparencies are positioned on the light box, the light from below passes through the slide and the reflected and enlarged figure is projected onto the screen. The size of the projected image is directly proportional to the distance of the projecting surface and the projector. Furthermore the optimum range is from 6 to 12 feet.

More expensive types can have even larger projection range. There are transportable (reflecting type) projector designs. They are additionally available, one could find the right model that suits their needs. These slide projectors have different benefits over any projection system and can be extremely convenient. One can even find lots of used overhead projectors as well in the market that are quite affordable, including one of this sort of projector into the list of workplace equipment can be extremely helpful.

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