Bahtinov Focus Masks
In 2008 an amateur telescope maker and astronomer ppublished an ingenious new way to easily focus your DSLR, webcam or CCD camera for taking astrophotos. The method is simple, very intuitive and the device has universally been named after the inventor. The Bahtinov Mask.
Farpoint manufactures this *LIFESAVING* astrophotography tool out of virtually indestructable ABS plastic and comes in two major types and in a range of sizes. The mask pictured below left is a general purpose mask designed to fit refractors and newtonian telescope. The mask pictured below right is designed to fit Schmidt Cassegrain telescopes. Both types of mask are available in a range of sizes to cover your needs.
Bahtinov focus mask for large telescopes. Fits telescopes with dew shield or tube diameter from 8.5" to 10.5" diameter.
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