Bahtinov Focusing Mask For Telescopes Fits 65mm To 100mm Outer Diameter Easy Quick Focus Tool For Reflectors Refractors Dobsonians MakCas SCTs NoBrainer Easy Alignment For Crystal Clear Star Shots

Focusing Mask with Bahtinov pattern for 65-100mm tubes
✔️ Adjustable 65-100 mm outer diameter mask fits many scopes.

The Bahtinov focusing mask is a precision laser-cut plexiglass aid designed to help you nail focus on both reflectors and refractors. It mounts with three metal posts that grip the telescope tube securely while staying centered, thanks to soft silicone sleeves that protect the surface. Compatible with reflectors, refractors, Dobsonians, Mak-Cas, and SCTs, it's a handy tool for astrophotography and serious sky-watching.

✅ Made from 2mm thick laser-cut plexiglass to resist cold brittleness
✅ Three metal posts with non-scratching silicone sleeves protect telescope surfaces
✅ 3-post mounting keeps the mask centered across a wide range of tubes
✅ Securing screws are capped with soft plastic to avoid telescope damage
✅ Adjustable to fit many optical tubes (aperture range about 290-340 mm depending on model)
✅ Works with reflectors and refractors including SCTs, Mak-Cass, Dobsonians
✅ Simply measure your telescope tube size to choose the right mask size

💡 What makes a Bahtinov focusing mask effective for achieving precise focus across different telescope types? It's a handy tool for quickly locking in sharp focus under varying seeing.

- precise focus guidance using diffraction spikes across reflector and refractor tubes - compatible with SCTs, Mak-Cass, Dobsonians, and refractors - improves repeatable focusing for astrophotography and visual observing ✝️