Bahtinov Focus Tool for DSLR Camera Lens
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Infinite Focus for Astrophotography
Developed in 2005 by the Russian amateur astronomer Pavel Bahtinov, the bahtinov focus mask works by diffracting incoming light into a predictable and recognizable pattern which you can then use as a guide to perfect infinity focus. With the mask attached, you'll be able focus to infinity within seconds, saving you set up time for nighttime photography.