View 2 of Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black For Outer Diameter from 150mm-200mm

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View 1 of Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black For Outer Diameter from 150mm-200mmView 2 of Astromania Bahtinov Mask That Focusing for Telescope - FM140mm for a Tube Outer Diameter (OD) from 150mm-200mm - can be Mounted with The Brass Screws Inside or Outside The drawtube Black For Outer Diameter from 150mm-200mm