2mm Telescope Focusing Bahtinov Mask Acrylic Focus Mask Plate 60-90mm 80-110mm 100-140mm 120-160mm for Astrophotography _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ 2mm Telescope Focusing Bahtinov Mask Acrylic Focus Mask Plate for Astrophotography _x000D_ _x000D_ Feature: _x000D_ _x000D_ 1. 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. _x000D_ _x000D_ 2. The mask takes the guesswork out of focusing and even overcomes conditions to give your telescope the best focus quickly and easily. _x000D_ _x000D_ 3. The mask grips the telescope tube gently and firmly with three metal posts. These metal posts come with scratch resistant silicone covers to protect your telescope surface. This prevents slippage while keeping the mask perfectly centered. _x000D_ _x000D_ 4.Thanks to this 3 post mount, the mask remains centered while fitting a wider range of telescopes. The bahtinov focus mask for telescopes is lightweight so you won't upset the balance of the scope. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Item Type:TelescopeFocusMask Material: Acrylic Thickness: Approx. 2mm / 0.08in Color: As Pictures Shown The Outer Diameter Size Range of the Telescope Objective Lens Is Supported: _x000D_ Approx. 60-90mm / 2.4-3.5in _x000D_ or Approx. 80-110mm/3.15-4.33in _x000D_ or Approx. 100-140mm / 3.9-5.5in _x000D_ or Approx. 120-160mm / 4.7-6.3in _x000D_ (there is an error of 1-2mm in manual measurement) _x000D_ _x000D_ Package List: _x000D_ _x000D_ 1 xBahtinovMask _x000D_ _x000D_ 3 xMountingAccessories _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_