So I read about Bahtinov Masks and came up with the following DIY solution for my Samyang 8mm f/2.8 fisheye II and 12mm f/2. Attached below is a cropped sample of what the B-mask result looked like to me (actually using Vega. Last night I decided to use and trust my Bahtinov mask. Bahtinov mask vs Minimum FWHM (with spider vanes) - posted in Beginning and Intermediate Imaging: I have a VC200L and to focus, Ive always relied on just finding the minimum FWHM reported by BYEOS on just about any bright star (like Vega). The Bahtinov focus technique works best with longer focal lengths. This Bahtinov Focus Mask snaps-in to your camera lenses that have the specified size filter thread. Pavel Bahtinov, a Russian amateur telescope maker and astronomer, created this simple, very intuitive method and the device has universally been named after him: The Bahtinov Mask. Although Ive managed to see quite a lot & image stuff through it, Ive never actually used the Bahtinov.This is probably because I dont have a clue how to use it. Whe I got my first telescope, about a year ago, it came with quite a few extras including one of these masks. This William Optics Bahtinov Mask attaches to your telescope's dew shield with diameter compatibility between 75 to 110mm aperture.
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