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Image of Starwave Bahtinov Mask for 290-340mm O.D
 

Starwave Bahtinov Mask for 290-340mm O.D

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...