Also known as projector dowser, projector shutter, mechanical shutter for video projectors.


Some examples:

You may prepare slides on your computer without projecting them, open the shutter and show only the correct images.

You may stop immediately the projection in case of problems with your computer or wrong images are visualized.

You may completely obscure the projected image so that you do not see the typical gray rectangle that video projectors show even when it’s running a black image.

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