Bahtinov focus mask for Celestron 9.25" SCT, FP415 Bahtinov focus mask for Celestron 9.25" SCT without Fastar or Hyperstar For older model C9.25" SCT's only...newer Fastar ready scopes need FP415H Bahtinov Focus Masks make focusing for astrophotography easy; instructions included Simply place the Bahtinov Focus Mask over the end of your telescope Made in the USA by Farpoint Astro