Hi Bernd,

Not sure I've fully understood your post, but I think you're referring to focus compensation I designed/implemented a couple years ago. The ability to characterize focus based on temperature (plus optional elevation residuals) was only partially released to the community. Logging characterization was released, but the full implementation was not released due to lack of interest, particularly in redesigning a needed config file (into a GUI). Here's the original post in case you haven't seen it that explains the gory details:

indilib.org/forum/ekos/7626-temperature-...us-compensation.html

To answer your questions about the interplay between camera and focuser, any needed focus adjustments are performed between camera exposures. The camera driver is not involved. Only Ekos code was modified, not INDI nor drivers.

FWIW, I have been using the feature for ~2 years now, and I'd never go back to the old archaic methods (delta t, delta time, or just running one of the types every so often). Insufficient control, and way too much wasted integration time. In the compensated approach, apriori knowledge of the OTA/optics temperature response is used to make any needed focus updates between exposures, thus avoiding the whole iterative approach (after the first seeded focus find).

FYI, Ekos releases have moved forward a couple versions since I implemented the feature. Hopefully this background helps. If you have further questions, you can always send me a PM. CS Doug

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