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Mise au point, Focus: Masque de Bahtinov pour objectif photo 52mm - FarPoint - Astronomie Pierro-Astro'
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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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EYSDON Bahtinov Mask Focusing Mask Fish Bone Plate Focus Slides for Telescopes (for Outer Diameter from 60mm-90mm) - AliExpress
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