Celticbird Bahtinov Mask Focusing Mask for Telescopes, Aluminum Metal Bahtinov Telescope Astronomy Focusing Mask for Outer Diameter from 144-196mm

Celticbird Bahtinov Mask Focusing Mask for Telescopes, Aluminum Metal Bahtinov Telescope Astronomy Focusing Mask for Outer Diameter from 144-196mm

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. Aluminum metal material. Suit for telescopes which out diameter 144mm to 196mm. Masks feature 3 holes which can be attached with 3 screws to prevent the mask from slippage and allow it to remaining central. Suitable for use on all types of telescope - reflectors, rafractors, Dobsonians, Mak-Cas and SCTs. Light weight so you won't upset the balance on your scope. Celticbird Bahtinov Mask Focusing Mask for Telescopes, Aluminum Metal Bahtinov Telescope Astronomy Focusing Mask for Outer Diameter from 144-196mm