Bahtinov Focusing Mask for DSLR Camera Lenses with 77mm filter threads | Snaps into a UV or Skylight filter [NOT INCLUDED] | Works with all DSLR cameras | Best for focal lengths greater than 100mm | Made in the USA by Farpoint Astro
Bahtinov Focusing Mask for DSLR Camera Lenses with 72mm filter threads | Snaps into a UV or Skylight filter [NOT INCLUDED] | Works with all DSLR cameras | Best for focal lengths greater than 100mm | Made in the USA by Farpoint Astro