GSO Crayford M-LRN 3" focuser is a focuser designed for Newtonian telescopes with a tube diameter of 303 mm. The Crayford mechanism with linear bearings provides smooth focusing during visual observations and in astrophotography applications.

The focuser is equipped with a dual-speed microfocuser with a 1:10 reduction ratio, allowing precise focus adjustment. The construction features a 3" connection and a reducer to the 2" standard, making it compatible with popular optical accessories.

Technical specifications

• application: Newtonian telescopes
• base fit for tube: 303 mm diameter
• focusing mechanism: Crayford with linear bearings
• microfocuser reduction ratio: 1:10
• focusing travel range: 50 mm
• connection: 3" with reducer to 2" standard
• external thread at the end of the focuser, under the 3" to 2" reducer: M74
• height of the focuser when fully retracted: 10.5 cm
• height of the focuser when fully extended: 15.5 cm
• mounting hole spacing: 102 mm
• number of mounting holes: 4
• required tube opening diameter: 110 mm
• focuser base dimensions: 125 × 125 mm
• material: anodized aluminum
• mass: 1200 g