The simplest method of projecting images employs a lensless projector, which is a large box with black side walls and a compact light source. In the front of the box there is an opening with slots where the slides are placed. This type of
projector
is commonly known as a Linnenbach projector, after Adolph Linnenbach who introduced it in 1916 at the Court Theatre in Dresden.
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The Linnenbach
projector
employs a 500-2000W
lamp
which projects images painted on a large transparency. Lensless projectors are used to project images with somewhat blurred details , such as clouds, trees, leaves, flowers or abstract shapes. The advantage of the Linnenbach
projector
is its extremly wide angle of 120 degrees or more, which makes it very useful in situations where the
throw
of the
projector
is short (for instance for back projecting on a shallow stage).
Its soft, “out of focus”, quality is an advantage , when projected on surfaces with varied textures and reflective qualities - the
image
will be equally blurred on all textures, and will not be sharper in one area than on other, as is the case with focusable projectors.
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