Universal Focusing Mask For Telescopes Fits 63 To 89mm Outer Diameter Easy Install With Three Bolts No Fuss Quick Sharp Focus For Reflectors Refractors Dobsonians Maksutov Cassegrain And More

Adjustable Bahtinov Mask Fits 63-89mm Telescopes Fast
✔️ 3 bolt grip on aluminum alloy for reflectors refractors and more

This Bahtinov focusing mask helps astronomers get sharp focus on reflectors refractors Dobsonians and similar scopes in backyard or observatory setups.

✅ Fits outer diameters from 63 to 89mm on multiple telescope types
✅ Three bolt install keeps mask centered with no slip
✅ 1mm thick aluminum alloy stays light at 47 grams
✅ Creates diffraction rays that line up for exact focus

💡 What is a focusing mask used for in astronomy? A focusing mask like the Bahtinov design turns starlight into visible patterns that show when your scope is perfectly tuned. - Users attach it to the front of the tube to remove guesswork during setup - The rays shift with each adjustment until they overlap at the sweet spot - Works well on any clear night for visual views or long exposure shots - Lightweight build keeps the balance right without adding strain

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