Hi all,

I've been trying to use ekos autofocusing with my ZWO EAF + ZWO ASI294 + skywatcher esprit100 but I am struggling with it. I have some few points that I am looking to get help with:

1. What is the recommended algorithm to use. I tried the gradient+polynomial as well as SEP+iterative but the first seems to work better, although still not ideal. What is typical tolerance percent value for these algorithms? 1%-2%,10%. I know this is relative to ones setup but just trying to get an idea of typical values.

2. If my focus is close to the "ideal" can I use the auto star detect or should I select the star myself? It is recommended not to choose a too bright or too dim start (mag 2-4) how do I choose a suitable star if I am selecting a star manually

3. During a in sequence HFR something odd is happening. I set a 5% threshold for the HFR to add to the measured HFR so the autofocus is triggered and set ekos to refocus . However the measured HFR is not updated on the sequence tab when autofocus is performed which is causing ekos to perform the auto focus more often than needed increasing the total acquisition time significantly.

4. For every autofocus run the convergence to a good HFR seems to take very long 7-9 trials even if the focus is close to "ideal". Is there a way to improve this convergence? This would be quite useful for in sequence autofocus since one does not need much of a change from a previous HFR value.

I would expect that Ekos autofocus would outperform a single focusing at the beginning of a sequence. I've watched the youtube ekos video tutorial on autofocus and looked at the manual but none of those answered my questions.

Thank you

Marcelo

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