Thanks Ron and DerPit for your replies and help.
Now I know that I have to let EKOS auto select the focus star, that's fine.

I had already tried focusing with full field. But in my experience it didn't work as good as single star. I think that EKOS was picking up a different set of stars each time, and therefore the average HFR value was very noisy and did not result in a smooth V-curve. With single star focusing, I get a nice V-curve, and together with the linear algorithm, focusing works nicely. Maybe I have to tweak the star detection settings.

One thing to improve:
When the user starts capturing (pressing "Play" on the sequence queue of the capture module) and has automatic re-focusing enabled while automatic focusing is not possible, please show a warning message! The user can then decide to skip auto re-focusing, or change the auto-focus settings.

Regards,
Steffen

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