Probably the quickest and easiest way to accurately focus your telescope for astro imaging. Bahtinov masks are an inexpensive tool which will allow you to achieve pin-sharp levels of focus, saving you time and improving your work. Simply place the mask over the front of your ‘scope, align the scope towards a star, adjust the focus until a symmetrical diffraction pattern appears, remove the mask, and you're done! Elegant, simple and effective. An array of masks are available for telescopes of differing outer diameters and they are compatible with both reflector and refractor telescopes.

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