While using a "normal" Bahtinov mask for a long time, I was wondering what about an upgrade and using a Tri-Bahtinov mask.
I read about the use of a Tri-Bahtinov mask on the website from Joost Drogenberg. Using the Bathinov Mask Drawing Generator - https://satakagi.github.io/tribahtinovWebApps/Tri-Bahtinov.html - I was able to prepare one for my TAL200K f/8.5 telescope. A local company did the lasercutting work based on the svg file.
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This evening I did a comparison test between both Bahtinov masks on the bright star Vega. With the normal Bahtinov, the centerline is good centered and thus in focus. Using the Tr-Bahtinov mask I get 6 groups of spikes each containing 3 lines. The principle is the same as before: make sure the centerline of each spike group is positioned in the center. According to some forums, the use of tri-bahtinov masks is made for Schmidt Cassegrain scopes to collimate for all axes.
