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Key lock function
Surface Quality: 60/40 (MIL-O-13830 standard)
So the number of "H-alpha-photons
Dovetail includes 1/4″ screw hole
Up to 998 Pagers
Buckeyestargazer TriBahtinov Mask for Telescope Focus & Collimation Size:Tribahtinov-ESDOB1245 Key lock functionThe Buckeyestargazer TriBahtinov Mask combines the proven focusing precision of a traditional Bahtinov mask with the added ability to assess and fine tune collimation on telescopes with adjustable optics. Using a three zone diffraction design, the TriBahtinov pattern allows astrophotographers to achieve highly accurate focus while also identifying optical alignment errors, making it particularly valuable for SCT, RC, Maksutov, and other collimatable
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