BAHTINOV FOCUSING MASK

The Bahtinov or focusing mask is a brilliant aid to get a perfect focus. When the telescope is pointed toward a bright star, the mask generates a specific diffraction pattern that makes the focusing procedure easy. Adjust the focus of your telescope till you will see a symmetrical pattern.

The mask is laser cut from glossy black acrylic and has slots for the included bolts which makes it possible to clamp it onto either the outside or inside of your telescope tube.