DSLR Camera Focus Masks
14 products
14 products
Focusing a telescope instead of a camera lens? See our full range of Bahtinov Focus Masks for telescopes, or use the Focus Mask Finder to match your scope.
Farpoint DSLR Camera Focus Masks bring precise Bahtinov focusing to camera lenses for wide-field astrophotography. Each mask snaps into a UV or clear filter that screws onto the front of your lens — select the size that matches the thread size of your filter (filter not included). Made from durable ABS plastic and manufactured in the USA.
How DSLR Focus Masks Work
The Bahtinov slit pattern creates diffraction spikes on a bright star. As you turn your lens's focus ring, the central spike shifts through the X-pattern — when it sits dead center, your lens is at perfect focus. It's the same technique astrophotographers use on telescopes, scaled to camera lenses for nightscape and wide-field imaging.
Choosing the Right Size
Round threaded masks are available in standard filter sizes from 52mm to 82mm, plus Cokin P and Cokin Z slot-filter versions. Match the mask to your UV or clear filter's thread diameter — not your lens's focal length and not the front element size. (Don't confuse filter thread size with lens diameter; the thread size is the number printed after the ⌀ symbol on your lens or filter.)
Focal Length Matters
The Bahtinov technique works best at longer focal lengths and becomes less useful as focal length drops. The practical lower limit is around 100mm — at shorter focal lengths the diffraction spikes are harder to resolve precisely. For lenses 100mm and longer, a DSLR Bahtinov mask is one of the most reliable focusing aids available.
Imaging through a telescope rather than a camera lens? Browse our telescope-specific Bahtinov Masks or our adjustable masks that fit a range of OTA sizes.