Bahtinov Mask For Telescopes FM60mm Focusing Tool Fits 65mm To 100mm Tube OD, Precision Laser Cut Plex, Mounts With Brass Screws Inside Or Outside Drawtube, Fast, Sharp Focus Under Any Seeing Conditions
✔️ 65-100mm tube OD with 2mm plexiglass, three-post mount
This Bahtinov mask is a precise focusing aid for telescopes, designed to fit a 65-100mm tube diameter. Color: Black. It works on both reflectors and refractors and is quick to set up in the field.
✅ Fits 65-100mm tube OD with 2mm laser-cut plexiglass for durability
✅ Three-post mounting with silicon sleeves to prevent scratches
✅ Brass screws allow secure, adjustable mounting inside or outside drawtube
✅ Laser-cut plexiglass stays stiff in cold conditions
✅ Centering retained by 3-post design for both reflectors and refractors
✅ Soft-plastic caps protect telescope surface when mounting
💡 What is a Bahtinov mask used for in telescope focusing and how does it work with 65-100mm tubes?
In short, it uses diffraction spikes to indicate when your image is in sharp focus, and it adapts to a range of tube diameters with a sturdy three-post mount.
- Handy for reflectors and refractors - Guides quick, repeatable focus under varying seeing conditions - Fits 65-100mm tubes with adjustable mounting✝️