Bahtinov Focusing Mask, Acrylic Telescope Focusing Mask, Support 100-140mm Telescopes, Astrophotography Astronomical Telescope Accessories, for Mirrors, Refractors, Dobsonians, Mak Cas, and SCT

• WIDE RANGE OF APPLICATIONS: The bahtinov mask telescope works with all types of telescopes, including mirrors, refractors, Dobsonians, Mak Cas, and SCT.
• PROVIDE TELESCOPE THE BEST FOCUS: The bahtinov focusing mask can take the guesswork out of focusing and ensures the best focus quickly and easily.
• SCOPE OF APPLICATION: The bahtinov mask supports telescope objective lens from 100-140mm, with a 1-2mm error in manual measurement.
• 3 METAL POSTS: Gently and firmly grips the telescope tube with three metal posts, preventing slippage while keeping the mask perfectly centered.
• 3 POSTS INSTALLATION AND LIGHTWEIGHT DESIGN: The bahtinov focusing mask remains centered and fits a wider range of telescopes due to the 3 post mount. Lightweight design maintains balance of the scope.

WIDE RANGE OF APPLICATIONS: The bahtinov mask telescope works with all types of telescopes, including mirrors, refractors, Dobsonians, Mak Cas, and SCT. PROVIDE TELESCOPE THE BEST FOCUS: The bahtinov focusing mask can take the guesswork out of focusing and ensures the best focus quickly and easily. SCOPE OF APPLICATION: The astromania bahtinov mask supports telescope objective lens from 100-140mm, with a 1-2mm error in manual measurement. 3 METAL POSTS: Gently and firmly grips the telescope tube with three metal posts, preventing slippage while keeping the mask perfectly centered. 3 POSTS INSTALLATION AND LIGHTWEIGHT DESIGN: The bahtinov focusing mask remains centered and fits a wider range of telescopes due to the 3 post mount. Lightweight design maintains balance of the scope. Spec: Item Type: Telescope Focus Mask Material: Acrylic Thickness: Approx. 2mm / 0.08in Color: As Pictures Shown Weight: Approx. 38g / 1.3oz The Outer Diameter Size Range of the Telescope Objective Lens Is Supported: Approx. 100-140mm / 3.9-5.5in (there is an error of 1-2mm in manual measurement) Package List: 1 x Bahtinov Mask 3 x Mounting Accessories