mhammady wrote:

phomer60 wrote: I am reasonably confident this is not a Mount issue as it only happens with the autofocus.
The only time I turn off tracking is when the mount is parked.
It is a Losmandy G11 with Gemini 2.




when I have something like that (keep loosing the focus star especially outside the green box with subframes), I start guiding before focusing. It helps retain the star in the green box. Also, I use a 64-bit box size just in case.


Guiding must be turned off while focusing as I am using off-axis guiding.

The problem is not that the star moves away from the centre, it is never in the centre in the first place, it is selected and positioned on the edge of the subframe it does not move to the edge.

Paul

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