120 mm Aluminium Bahtinov Focusing Mask

Achieve repeatable focus for astrophotography by using the diffraction pattern from a precisely cut aluminium Bahtinov mask sized for approximately 120 mm observable diameter.

Key features

• Diffraction-spike pattern makes focus error easy to see
• Aluminium construction is durable and reusable
• 120 mm size for compatible telescope apertures
• Useful for cameras, planetary imaging and deep-sky setup
• Quick visual method reduces focus guesswork

Specifications

Package includes

• One 120 mm focusing mask
• Mounting pads or screws shown

Compatibility & safe use

Measure the telescope's usable aperture and mounting location before ordering. This mask is not a solar filter and must never be used for direct Sun observation.

Free shipping across Australia is included in the listed price.