![A Tri-Bahtinov mask for SCT collimation and focusing - Page 2 - Equipment (No astrophotography) - Cloudy Nights A Tri-Bahtinov mask for SCT collimation and focusing - Page 2 - Equipment (No astrophotography) - Cloudy Nights](https://www.cloudynights.com/uploads/monthly_06_2017/post-274902-0-59004800-1498738143.jpg)
A Tri-Bahtinov mask for SCT collimation and focusing - Page 2 - Equipment (No astrophotography) - Cloudy Nights
![Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM230mm for a Tube Outer Diameter (OD) from 250mm-290mm - can be Mounted with The Brass Screws Inside or Outside The drawtube : Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM230mm for a Tube Outer Diameter (OD) from 250mm-290mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :](https://m.media-amazon.com/images/I/61221yG8IQL._AC_UF894,1000_QL80_.jpg)
Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM230mm for a Tube Outer Diameter (OD) from 250mm-290mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :
![STL file Bathinov mask for Skywatcher telescope 200 x 1000 bahtinov・Design to download and 3D print・Cults STL file Bathinov mask for Skywatcher telescope 200 x 1000 bahtinov・Design to download and 3D print・Cults](https://files.cults3d.com/uploaders/13701151/illustration-file/c5684421-574c-41ec-aaef-5994a4e0776c/bahtinov-2.jpg)