Premium Bahtinov Mask for Telescopes - 60mm & 90mm Acrylic Focusing Aid with 2mm Slits | Perfect for Astrophotography, Stargazing, and Telescope Alignment

1. WIDE RANGE OF APPLICATIONS - Works with all types of telescopes, mirrors, refractors, for Dobson, for Mak Case and for SCT, all you need to do is measure the size of your telescope tube and choose the appropriate mask size. 2. BAHTINOV MASKS FUNCTION: The mask eliminates the approximations of focus and even overcomes viewing conditions to give your telescope the best focus quickly and easily. 3. 3 Metal Poles The mask grabs the telescope tube gently and firmly with three metal poles. These metal poles come with scratch resistant silicone covers to protect the surface of your telescope. This prevents slipping while keeping the mask perfectly centered. 4. Post-Installation & Lightweight Design: With this 3-position mount, the mask stays centered while adapting to a wider range of telescopes. The Bahtinov focusing mask for telescopes is lightweight so as not to disturb the balance of the scope. 5. Applicable Size The outer diameter of the bahtinov mask supports the telescope lens in the range of 60-90mm (there is an error of 1-2mm in manual measurement). Specification: Item Type: Telescope Focus Mask Material: Acrylic Thickness: approx. 2 mm/0.08 inches. Colour: as shown in the pictures. Weight: approx. 21 g / 0.7 oz. The outer diameter range of the telescope lens is supported: approx. 60-90 mm/2.4-3.5 inches (there may be a 1-2 mm error due to manual measurement). Package List: 1 x Bahtinov Mask 3 x mounting accessories.