Bahtinov Focus Masks

A Farpoint Bahtinov Mask is an ingenious new way to easily focus a telescope. Pavel Bahtinov, a Russian amateur telescope maker and astronomer, created this simple, very intuitive method and the device has universally been named after him: The Bahtinov Mask. Measure the diameter of the outside of your dew shield (or OTA) and select your Bahtinov Mask size accordingly. For more information: