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Amazon.com : Telescope Focusing Bahtinov Mask 120-160mm Lightweight with Metal Posts, for Precision Astrophotography and Clear Telescope Focus : Electronics
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Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM60mm for a Tube Outer Diameter (OD) from 65mm-100mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :
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