Perfect star focus in seconds
Bahtinov focus masks and filters for telescopes and camera lenses, from Johannes Scientific.
Our most popular mask
The clip-on DSLR Bahtinov Mask fits camera lenses from 60 to 160 mm and gets you to infinity focus in seconds.
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 to focus to infinity within seconds, saving you setup time for nighttime photography.
Highest Precision
Pinpoint star focus for camera lenses. The Kase Bright Star threads onto 77mm or 82mm lenses and snaps on magnetically, with the magnetic adapter included.
Focus and Collimate with One Tool
The Tri-Bahtinov mask shows three diffraction patterns at once, so you can check focus and collimation on a single star. Built for SCTs, Newtonians, and RCs.
Get the right focus for your setup
Bahtinov Focus Tools for DSLRs
Bahtinov Focus Tools for DSLRs
Highest Precision Bahtinov Masks
Highest Precision Bahtinov Masks
Biggest Bahtinov Masks
Biggest Bahtinov Masks
Solar Filter - Sun Viewing
Solar Filter - Sun Viewing
Guides
From choosing the right mask to fine-tuning collimation, our step-by-step guides help you get sharper stars, faster.
