![Bahtinov and Tri-Bahtinov focus/collimation software - Equipment (No astrophotography) - Cloudy Nights Bahtinov and Tri-Bahtinov focus/collimation software - Equipment (No astrophotography) - Cloudy Nights](https://www.cloudynights.com/uploads/monthly_06_2023/post-337912-0-21853000-1686021205.jpg)
Bahtinov and Tri-Bahtinov focus/collimation software - Equipment (No astrophotography) - Cloudy Nights
![Farpoint Bahtinov Focus Mask for Telescopes with Dew Shield or Front End Diameter from 2.5" to 4.5" # FP400 Farpoint Bahtinov Focus Mask for Telescopes with Dew Shield or Front End Diameter from 2.5" to 4.5" # FP400](https://agenaastro.com/media/catalog/product/cache/ac66349dbba016d6e2fde5f755f0244d/b/a/bahtinovmaskvectorized_circular_1.jpg)
Farpoint Bahtinov Focus Mask for Telescopes with Dew Shield or Front End Diameter from 2.5" to 4.5" # FP400
![Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM100mm for a Tube Outer Diameter (OD) from 105mm-150mm - can be Mounted with The Brass Screws Inside or Outside The drawtube : Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM100mm for a Tube Outer Diameter (OD) from 105mm-150mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :](https://m.media-amazon.com/images/I/61ALd471rYL.jpg)
Amazon.com : Astromania Bahtinov Mask Focusing Mask for Telescopes - FM100mm for a Tube Outer Diameter (OD) from 105mm-150mm - can be Mounted with The Brass Screws Inside or Outside The drawtube :
![Astrozap Focusing cap w/ built-in Bahtinov focusing mask for most 130mm aperture refractors | Astronomics.com Astrozap Focusing cap w/ built-in Bahtinov focusing mask for most 130mm aperture refractors | Astronomics.com](https://www.astronomics.com/media/catalog/product/cache/1/image/767x1014/9df78eab33525d08d6e5fb8d27136e95/1/7/17209_1_.jpg)
Astrozap Focusing cap w/ built-in Bahtinov focusing mask for most 130mm aperture refractors | Astronomics.com
![Astrozap Focusing cap w/ built-in Bahtinov focusing mask for most 130mm aperture refractors | Astronomics.com Astrozap Focusing cap w/ built-in Bahtinov focusing mask for most 130mm aperture refractors | Astronomics.com](https://www.astronomics.com/media/catalog/product/cache/1/image/1800x/040ec09b1e35df139433887a97daa66f/1/7/17209_1_.jpg)