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Bahtinov Mask Rc8 90-135 Download free files now ›
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Two clear bahtinov masks for focusing telescopes.
Large size suits tubes with outside diameter of 190mm-250mm. Small size suits tubes with outside diameter 90-145mm. Both masks have 3mm wide slots suited for 3mm (M3) threads - recommend using a long brass M3 stand-off coated in plastic tape or hose and thumb screws to act as posts to enable mask to sit on scope.

30q538cs would like to share their product with the following license Attribution NonCommercial ShareAlike license Read the fine print of this license
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Additional info: Listed on Feb 09, 2018 Viewed 569 times Report this item to Ponoko

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