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Bahtinov mask
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The Bahtinov mask is a device used to accurately focus astronomical telescopes. It is named after its inventor Pavel Bahtinov. Accurate focusing of telescopes and astrographs is particularly of concern to those involved in astrophotography.
Wikipedia http://en.wikipedia.org/wiki/Bahtinov_mask
Wikipedia http://en.wikipedia.org/wiki/Bahtinov_mask
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