Bahtinov Mask for Telescopes 100-140mm, Acrylic Focus Mask with 3 Metal Posts for Astrophotography, Easy Installation for Newtonian Refractor SCT

• Achieve Perfect Focus for Astrophotography: This Bahtinov mask takes the guesswork out of focusing your telescope. It quickly provides the sharpest focus, overcoming vision conditions for stunning, clear celestial images.
• Universal Fit for 100-140mm Telescopes: Designed to fit telescope objective lenses from 100mm to 140mm in diameter (approx.). Works with Newtonian reflectors, refractors, SCTs, Maksutov-Cassegrains (Mak Cas), and Dobsonian telescopes.
• Secure & Protective 3-Post Mounting System: Features three adjustable metal posts with soft silicone covers. They grip your telescope tube firmly without slipping or scratching, ensuring the mask stays perfectly centered.
• Lightweight & Balanced Acrylic Design: Crafted from durable 2mm thick acrylic, this focus mask is incredibly lightweight (approx. 38g). It won't upset your telescope's balance or add significant weight during use.
• Easy to Install and Use: Simply measure your telescope's tube, adjust the three posts, and attach the mask. Start capturing precisely focused stars and planets in minutes, making it ideal for both beginners and eerienced astronomers.

Specification: 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