Farpoint Snap-In 62mm Camera Filter Bahtinov Focus Mask

Based on the design by Russian amateur telescope maker and astronomer Pavel Bahtinov, the Farpoint Astro Snap-In 62mm Camera Filter Bahtinov Focus Mask is used to quickly and easily focus your DSLR, webcam, or CCD camera for all types of astrophotography. Using this mask takes the guesswork out of focusing on astronomical objects and ensures tack-sharp stars, planets, and just about any other celestial subject you want to photograph or image. Made of durable ABS plastic, the mask is designed to snap into your 62mm UV or Skylight filter and can be used used on lenses with focal lengths of 100mm and longer for peak performance. This is just the focusing mask; you need to provide the compatible filter for proper use.