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Despite the ubiquitous existence of high-tech equipment exactly like laptops and LCD projectors which can be ordinarily found in conferences and office meeting rooms these days, the former (old) technology used for presentations and lectures, overhead slide projectors remain as a favorite gadget for most and we can still find its presence and it is common in a number of places.

Creators of a majority of these projectors are constantly upgrading and improving this system to provide the best performance and satisfaction, this indicates that this simple projection technology is going to stay. An overhead projector is mainly a slide projector, a slide which is a plastic clear sheet (often known as transparencies) is used to draw, write as well as print the matter to be presented.

When these transparent sheets are placed over the projector, the content is projected on to a screen or surface big enough to suit the viewers. They are very simple and easy to work with; the most typical variety of of overhead projector consists of a light box plus a reflector, the light box is composed of a light, a cooling fan and a double faced Fresnel lens that also serves as a cover of the box. The reflector which is mounted on an adjustable arm consists of a mirror and a lens to target and redirect the light.

When the slides and transparencies are positioned on top of the light box, the light from below passes through the slide and the reflected and enlarged image is projected onto the screen. The size of the projected image is exactly proportional to the distance of the projecting surface and the projector. Also the optimum range is between six to twelve feet.

More expensive types can have even wider projection range. There are transportable (reflecting type) projector designs. They are additionally available, one can find the proper model that suits their needs. These slide projectors have various advantages over any projection system and might be incredibly functional. One can also find a lot of used overhead projectors as well in the market that are quite inexpensive, including one of this type of projector into the list of workplace equipment will be extremely advantageous.

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