[stephen2615 (Stephen)]

Greetings,

I have a Sky Rover refractor that uses the Kunming United Optics Crawford style focuser. It has appalling backlash and I don't have much luck trying to get my autofocus routine (in NINA) to consistently give me a nice V shape with my Pegasus Focus Cube 2. More often than not, it ends up with a saw tooth pattern. Sometimes the autofocus routine just gives up as it cannot find decent HFR especially when changing filters or HFR has changed due to the scope finding better skies towards meridian flip.

I am wondering that given the backlash that it is so bad that I might be better off getting another quality focuser to help with the autofocus routine. There are various grub screws under the focuser but I cannot find anything that tells me what screw does what so it is very frustrating trying to determine if there might be a simple fix to the backlash or it is just a piece of garbage and I need to look at something better.

The backlash is very obvious as the Focus Cube 2 locks the focuser so it cannot be manually turned. When turning the focuser knob, the focuser moves up to two mm before the Focus Cube stops the movement.

Any ideas or suggestions would be very welcome. TIA.

Stephen