Tri Bahtinov mask for every size telescope
The Bahtinov mask is a device used to focus small astronomical telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov (Russian: Павел Бахтинов) in 2005.Precise focusing of telescopes and astrographs is critical to performing astrophotography.
The telescope is pointed at a bright star, and a mask is placed in front of the telescope’s objective (or in front of the aperture).
The mask consists of three separate grids, positioned in such a way that the grids produce three angled diffraction spikes at the focal plane of the instrument for each bright image element. As the instrument’s focus is changed, the central spike appears to move from one side of the star to the other
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