Science Education Supplies By Sanpyl

• UNIVERSAL COMPATIBILITY: Suitable for all types of telescopes including reflectors, refractors, for Dobsonians, for Mak Cas, and for , fitting telescopes with an outer diameter of 63 to 89mm. The focusing mask can be easily installed on any telescope with 3 bolts.
• FOCUSING: The Bahtinov mask eliminates guesswork during focusing, overcoming visual conditions to quickly and easily achieve optimal focus for your telescope.
• SECURE GRIP: Three metal columns of the mask clamp the telescope to prevent slipping while keeping the mask perfectly centered. The 3 column design allows for central alignment and compatibility with a wider range of telescopes.
• DIFFRACTION PATTERNS: The focus fishbone acts as a set of artificial . As light passes through the fishbone plate, it diffracts in 3 different directions, creating 3 pairs of rays. With focus adjustments, the ray patterns move until the 3 sets of rays align, indicating proper focus.
• LIGHTWEIGHT AND ALUMINUM ALLOY: The telescope focusing mask features a thin and sturdy design made of 1mm thick aluminum alloy material, lightweight and to maintain balance without damaging the telescope.