3D printed accessories for hassle-free astrophotography

Made in Germany - Shipped from Germany

Tri-Bahtinov Mask for Focusing and Collimation Control for Various Reflectors

A Bahtinov mask with a special pattern for reflector telescopes. It allows easier focusing and collimation control at the same time.

(use the arrows on the left and right sides in the middle of the frame to scroll through pictures)

The mask pattern is calculated according to an improved formula and brings better illumination, see the discussion on Cloudy Nights forum and the original design on GitHub.

Currently, musks are available for the following reflectors:

  • Celestron C8 OTA
  • Celestron EdgeHD 800 8 inch
  • Celestron NextStar Evo 8 inch
  • GSO (and similar) RC8 8 inch f/8 Ritchey-Chretien
  • Vixen R220 SS 800mm Newton

Please note that the mask is created in two parts, which are then glued. Traces of glue along the border between the parts are possible. But this does not affect the function of the mask.

If you have questions, feedback or suggestions for custom changes, please contact us using this form.


VAT exempted according to UStG ยง19
Delivery Time: ca. 3-4 workdays
Additional costs (e.g. for customs or taxes) may occur when shipping to non-EU countries.