Download Generic Bahtinov Mask Template for 127mm aperture - (127mm-bahtinov-mask-template-a4.pdf)Download 127mm-bahtinov-mask-template-a4.pdf from Lonewolf Online
The Bahtinov mask is a device used to accurately focus astronomical telescopes. It is named after its inventor Pavel Bahtinov. This is a downloadable template you can print and make your own mask.
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