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.
Suit for telescopes which out diameter 75mm to 125mm.
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.
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