Aluminium Bahtinov Focusing Mask – 150–200 mm OTA

A durable aluminium Bahtinov mask for fast, repeatable focus confirmation during telescope imaging with compatible 150–200 mm optical tubes.

Free standard shipping Australia-wide.

Key features

• Diffraction-spike focusing pattern
• Aluminium alloy construction
• Adjustable fit for compatible optical tubes
• Useful for astrophotography and camera-assisted focusing
• Reusable alternative to lightweight plastic masks

Specifications

• Selected model: 140 mm mask
• Compatible telescope outer diameter: 150–200 mm
• Material: aluminium alloy
• Type: Bahtinov focus aid
• Check clear aperture and retaining arrangement before purchase

What's included

• Bahtinov focusing mask
• Adjustable retaining hardware as supplied

Compatibility & safe use

Remove the mask before imaging. Never use it for solar observation, and secure it carefully so it cannot fall onto optics or equipment.

Please check the stated dimensions, interface and compatibility before ordering.