Telescope Bahtinov Mask
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A Bahtinov mask is a focusing tool for astronomy and astrophotography, designed by amateur astrophotographer Pavel Bahtinov. The mask consists of a disk with opaque material fitted over the telescope objective, featuring slots cut in a specific pattern. To learn more about this device, refer to this CloudyNights thread or visit Spike-a.com. This description was sourced from astrojargon.com. The inner diameter of the fitting is 166.50mm and the outer diameter is 169.50mm with an overall measurement of 175.71mm.
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