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A planetarium projector, also known as a star projector, is a device used to project images of celestial objects onto the dome in a planetarium. Modern planetarium projectors were first designed and built by the Carl Zeiss Jena company in Germany between 1923 and 1925, and have since grown more complex.
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A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers.
The A Series As noted, Spitz wanted to create a projector more affordable than the German Zeiss "all optical" projectors. Thus, all of his projectors used large "star balls" that relied on the pinhole lens principle, where star images became smaller (more realistic) as the starlight source (in center of the star ball) was more distant from the star-ball surface.
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