Tri Bahtinov Mask for Skywatcher 130PDS

thingiverse

Tri Bahtinov mask for Skywatcher 130PDS. It allows to focus and to Check the collimation at the same time. Place it on the scope so the holes/holders match the collimation bolts of the primary mirror. I have included 3 versions of the mask: A) Tri-Bahtinov 130PDS FL650 BF200 - for Focal length 650 Bahtinov Factor 200 B) Tri-Bahtinov 130PDS FL650 BF180 - for Focal length 650 Bahtinov Factor 180 C) Tri-Bahtinov 130PDS FL585 BF180 - for Focal length 585 Bahtinov Factor 180 (I use Skywatchers Coma Corrector, which is 0.9 FL reducer, so my scope has 585mm Focal length). The Higher Bahtinov factor increases the length of the spikes and makes focusing/collimation more precise, however, it also makes stems of the mask very thin and the mask becomes very fragile... My test with BF 220 has not survived the removal from the printing bed. All masks are created using Satakagi's online tool https://satakagi.github.io/tribahtinovWebApps/Tri-Bahtinov_symmetric.html Big "Thank you" to him. .Step file is also included P.S. Print the first layer slowly!