I guide on-axis (reflective slit) on a C11 at f10 and NEQ6pro using a Lodestar camera 1x1 binning.
I've used PHD (1&2) for many years, but now let AstroArt control the cameras and the guiding.
The slit gap is usually around 25micron and I guide for ten min subs....
No issues, no drama.
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