Pro 3'' Newtonian Crayford Focuser, Dual Speed

Large unobstructed aperture: 3” focuser

The back end is especially important: the bearing-mounted 3” Linear Crayford Focuser gives you enough space to illuminate even large format image fields without vignetting.

A hybrid of Crayford and guide rail offers you the effortlessness of a Crayford focuser with the stability of a good rack and pinion focuser.

• Always the perfect object alignment: focuser is completely rotatable
• Reducer from 2” to 1.25” with integrated compression ring
• Fine adjustment for the perfect focus: 1:10 reduction for minimal focus setting
• Setting scale so you can quickly find your focus again
• Highly stable: no movement so the camera remains perfectly aligned to the optical axis and the picture remains sharp

Connections: M78x0.75 (female), Adapter (3mm optical length) to M74x0.75 (male), M74 - 2" reduction (25mm optical length), 2" - 1.25" reduction (10mm opt. length)

Base plate included, holes 102mm in both directions; flange diameter 116mm (telescope-sided) resp. 109mm (focuser-sided) - flange has step down so focuser can not slide out of base plate.

Possible Backfocus with flange: 65mm (M74 thread), 90mm (2"), 100mm (1.25")