120-160mm Telescope Focus Mask For Astrophotography, Lightweight Three-Post Focus Tool For Precise Focusing, Compatible With Refractors, Dobsonians, Mak-Cassegrains And SCTs, Quick Setup And Sharp, Repeatable Focus Every Night
✔️ Includes 1 mask and 3 mounting posts for stable centering
This lightweight Bahtinov-style telescope focus mask is designed to fit refractors, Dobsonians, Mak-Cassegrains, and SCTs with an outer diameter range of 120-160mm (4.7-6.3in). The three-post mounting with silicone covers gently grips the tube to keep the mask centered without scratching the surface, while the diffraction pattern provides instant visual confirmation of sharp focus for quick, repeatable results.
✅ 120-160mm outer diameter range supported (4.7-6.3in) with ±1-2mm measurement variance
✅ Three-post mounting with silicone sleeves for gentle, secure grip
✅ Lightweight acrylic construction ~2mm thick, total weight ~46g (1.6oz)
✅ Compatible with refractors, Dobsonians, Mak-Cassegrains and SCTs
💡 What is a telescope focus mask and how does it help with precise astrophotography for 120-160mm tubes?
This handy accessory guides focus quickly by showing a clear diffraction pattern that confirms sharpness.
- Improves focus accuracy for 120-160mm tube hardware using a diffraction-based pattern- Handy tool for quick nightly focus with minimal setup time
- Lightweight, centered mounting reduces image drift during long exposures
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