1. Wide Applications: Works with all types of telescopes, mirrors, refractors, for Dobsonians, for Mak Cas and for , all you need to do is measure your telescope tube size and choose the appropriate mask size.2. Good Functions: The mask takes the guesswork out of focusing and even overcomes conditions to give your telescope the best focus quickly and easily.3. Metal Posts: The mask grips the telescope tube gently and firmly with three metal posts. SUPER STUD SANDAL CLEAT REPLACEMENT STUDS - 36 PER PKG. HT Enterprises. $8.79 (You save ). (No reviews yet) Write a Review Post Installation and Lightweight Design: Thanks to this 3 post mount, the mask remains centered while fitting a wider range of telescopes. Applicable Size: The outer diameter of the bahtinov mask supports the telescope objective lens in the range of 120 to 160mm (there is a 1‑2mm error in manual measurement). Aazon.co: Telescope Focus ask Acrylic Focus ask Plate Bahtinov ask... Bahtinov Mask Telescope Focusing Acrylic Focus Mask 120 To Bahtinov Mask For Dslr These metal posts come with scratch silicone covers to your telescope . Astromania Bahtinov Mask Focusing Mask for Telescopes - FM140mm for a tube outer diameter (OD) from 150mm-200mm The bahtinov focus mask for telescopes is lightweight so you won't upset the balance of the scope. The bahtinov focus mask for telescopes is lightweight so you won't upset the balance of the scope.5. Applicable Size: The outer diameter of the bahtinov mask supports the telescope objective lens in the range of 120 to 160mm (there is a 1?2mm error in manual measurement). Specification:Item Type: Telescope Focus MaskMaterial: AcrylicThickness: Approx. 2mm / 0.08inColor: As Pictures ShownWeight: Approx. 46g / 1.6ozThe Outer Diameter Size Range of the Telescope Objective Lens Is Supported: Approx. 120-160mm / 4.7-6.3in (there is an error of 1-2mm in manual measurement)packing list:1 x Bahtinov Mask3 x Mounting Accessories This prevents slippage while keeping the mask perfectly centered.4. Post Installation and Lightweight Design: Thanks to this 3 post mount, the mask remains centered while fitting a wider range of telescopes.
