MEOPTEX Bahtinov Mask Focusing Mask for Telescopes (For Outer Diameter from 150mm-200mm) For Outer Diameter from 150mm-200mm Size:For Outer Diameter from 150mm-200mm Safety Guarantee:Built with multiple circuit

Safety Guarantee:Built with multiple circuit protection (over-charging

RAM 2500 or RAM 3500 1994-2021) - Designed for Optimized FM/AM Reception (Blue)

Double cutaway semi-bullet tips prevent string dragging

You also could use it for anywhere

combining the toughness of Kevlar with the stability and all-weather performance of Mylar film

MEOPTEX Bahtinov Mask Focusing Mask for Telescopes (For Outer Diameter from 150mm-200mm) For Outer Diameter from 150mm-200mm Size:For Outer Diameter from 150mm-200mm Safety Guarantee:Built with multiple circuitMEOPTEX Bahtinov Mask Focusing Mask for Telescopes (For Outer Diameter from 150mm 200mm) Size: For Outer Diameter from 150mm 200mm "Bahtinov masks take the guesswork out of focusing and even get over the seeing conditions as it is a mathematical type approach to the task. The best focus for your telescope quickly and easily. Suitable for use on all types of telescope reflectors, rafractors, Dobsonians, Mak Cas and SCTs. They are made from precision