BAHTINOV FOCUSING MASK FOR MEADE ETX-125 OTA
thingiverse
Bahtinov focusing mask is a convenient astronomy tool to ease manual focusing of stars. The mask is placed in front of telescope's aperture. The telescope is pointed to a bright star. The mask produces 3 diffraction spikes. Two of them form an "X" shape, and another spike crosses it, forming a "Ж" shape. Adjusting telescope focus causes the central spike to move left or right, relative to the "X" spikes. When precise focus is achieved - the pattern becomes symmetrical. The 3D-printed bahtinov focusing mask is designed to fit Meade ETX-125 OTA with 127 mm (5") clear aperture, 1900 mm focal length (f/15). and 148 mm OD. The mask is printed from black ABS filament on a delta printer.
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