Dual-Speed 2-inch Crayford Focuser for SCT Telescopes
DUAL-SPEED 2" CRAYFORD FOCUSER FOR SCT (SCHMIDT-CASSEGRAIN) TELESCOPES FROM OVL (Optical Vision Ltd, the official Skywatcher distributor in the UK and Western Europe).
A high quality CNC Machined 10:1 dual-speed Crayford focuser designed as an upgrade to Schmidt Cassegrain Telescopes.
Will accept both 1.25" and 2" standard format eyepieces. Provides an exceptionally smooth focusing operation with the utmost precision, with the aid of its fine-focusing facility. Features indexed drawtube.
Specifications of the 2-inch dual speed crayford focuser for SCT from Skywatcher
Outer diameter (silver bottom part): 90mm
Outer diameter (black part above silver part): 84mm
This focuser is not compatible with the 20929 Skywatcher motor focuser.
1. Celestron C9.25 Edge HD with ZWO ASI294MC-PRO camera.
ADJUSTING THE FOCUSER
According to some user feedback, the following notes might be helpful if your focuser is not performing perfectly and needs adjusting...
1st: try this:
To adjust the rotation friction, there are three recessed set screws around the perimeter.
The friction of the focuser can be adjusted by turning the recessed Allen screw located in the centre between the focusing knobs.
2nd: if the above provided only partial results, check out the PDF instruction
This attached instruction is for a different, but similarly constructed focuser so might help too:
information/ARCHIV/sbau- micro10-la/pdf/Crayford_ adjustment_SW120ED.pdf