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 and point the remote at

and point the remote at the controller

Can use them in your art class

This product is made of cattle bone and rosewood

3mm (13/64") Height

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 and point the remote atMEOPTEX 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