TRI-Bahtinov Focus Mask - Celestron Guidescope Item Number FCD100–127075–02 Focal Length

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TRI-Bahtinov Focus Mask - Celestron Guidescope Item Number FCD100–127075–02 Focal LengthWhat is the Tri Bahtinov? Essentially three Bahtinov masks in one, rotated over 120 degrees. It gives you three lines and three crosses to check focus and collimation, along three axis simultaneously. In addition to focusing, the Tri Bahtinov so also indicates collimation status along three axis. This is interesting for e. g. Schmidt Cassegrain telescopes, where the collimation is done by push pull screws of the secondary mirror along three axis. When

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