Farpoint Bahtinov Focus Mask — Celestron 8" SCT (Hyperstar/Fastar)Not sure this is the right mask for your telescope? Use our Focus Mask Finder match your scope to the right Standard, Tri Bahtinov, or Hyperstar RASA mask. Custom fit Bahtinov focus mask for the Celestron 8" SCT with Hyperstar Fastar capability (post 2008 models). Drops onto the front of your telescope, gives you perfect focus in seconds, and lifts off cleanly when you're done. Made in our own shop in the USA American materials, American machinery, by