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The Bahtinov mask is a device used to accurately focus astronomical telescopes. It is named after its inventor Pavel Bahtinov. Accurate focusing of telescopes and astrographs is particularly of concern to those involved in astrophotography.Wikipedia http://en.wikipedia.org/wiki/Bahtinov_mask
Bahtinov mask
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- this product is 3D printed
- 16 available colors
- material is a strong plastic
- free delivery by May 09
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Bahtinov mask
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