Farpoint Bahtinov Focus Mask — 62mm DSLR LensBahtinov focus mask for camera lenses with 62mm filter threads. Snaps into the threads of an inexpensive 62mm UV filter (one time install). From there, screw the filter onto your lens for a focus check, then unscrew it to shoot quick and tool free. Made in our own shop in the USA American materials, American machinery, by Americans. Works with any DSLR or mirrorless camera lens that takes a 62mm front filter. UV filter sold separately any inexpensive