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3D Printable Ø114mm Bahtinov mask (designed for Arena telescope 900mm focal length) by Stuart Bateman
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Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM180mm for a Tube Outer Diameter (OD) from 195mm-240mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :
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Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM200mm for a Tube Outer Diameter (OD) from 215mm-260mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :
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Amazon.com : SVBONY Bahtinov Mask Focusing Mask Aluminum Alloy Telescope Focusing Mask 60-115mm Caliber Fixed Diameter 65-100mm : Electronics
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