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March/April 1983, page 32 (PDF, #14)

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SKU: 014-032 Category:

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side, one tiny water spot becomes two. You see a "ghost" when you rest your fingertip against the glass. On a projector, this means you will get two images traveling to the screen. At average distances, they will be 1/8" to 1A" out of alignment. This …

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