Akozon Focusing Mask, 2mm Focusing Telescope Bahtinov Acrylic au for Focus Telescopes 60 to 90mm Plate Astrophotography in Outer Diameter 90mm Tube with 3 Stable Metal Rods

• 3 Metal Poles: The mask grips the telescope tube gently and firmly with three metal poles. These metal poles come with scratch resistant silicone covers to protect the of your telescope. This prevents slippage while keeping the mask perfectly centered.
• Applicable size: The outer diameter of the bahtinov mask supports the telescope objective lens within the range of 100-140mm (there is an error of 1-2mm in manual measurement).
• Wide range of applications: works with all types of telescopes, mirrors, refractors, for Dobsonian, for Mak Cas and for SCT, all you have to do is measure your telescope tube size and choose the size appropriate mask.
• Post-Installation and Lightweight Design: With this 3-post 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 upset the balance of the telescope.
• Function of Bahtinov Masks: The mask takes the guesswork out of focusing and even overcomes viewing conditions to get your telescope in the best focus quickly and easily.
• Applicable size: The outer diameter of the bahtinov mask supports the telescope objective lens within the range of 100-140mm (there is an error of 1-2mm in manual measurement).
• 3 Metal Poles: The mask grips the telescope tube gently and firmly with three metal poles. These metal poles come with scratch resistant silicone covers to protect the of your telescope. This prevents slippage while keeping the mask perfectly centered.
• Wide range of applications: works with all types of telescopes, mirrors, refractors, for Dobsonian, for Mak Cas and for SCT, all you have to do is measure your telescope tube size and choose the size appropriate mask.
• Post-Installation and Lightweight Design: With this 3-post 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 upset the balance of the telescope.
• Function of Bahtinov Masks: The mask takes the guesswork out of focusing and even overcomes viewing conditions to get your telescope in the best focus quickly and easily.

3 Metal Poles: The mask grips 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 slippage while keeping the mask perfectly centered. Wide range of applications: works with all types of telescopes, mirrors, refractors, for Dobsonian, for Mak Cas and for SCT, all you have to do is measure your telescope tube size and choose the size appropriate mask. Post-Installation and Lightweight Design: With this 3-post 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 upset the balance of the telescope. Function of Bahtinov Masks: The mask takes the guesswork out of focusing and even overcomes viewing conditions to get your telescope in the best focus quickly and easily. Applicable size: The outer diameter of the bahtinov mask supports the telescope objective lens within the range of 100-140mm (there is an error of 1-2mm in manual measurement). Specification：100% brand new and high quality Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, Thank you!