Diffraction Spikes Bahtinov Focusing Mask for Telescopes Dew Shield Diameter from 105mm -148mm
5.0/5
Product ID: 69881829
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Description
Optical transmission: 92% and above
Made with optical grade PMMA material
Easy to mount on 3" – 4.2" refractor telescope
William Optics Diffraction Spikes is an ultra high optical transmission Bahtinov mask which produces the clearest, brightest and longest diffraction spikes facilitating focusing with ease and accuracy.
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