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Hi Chris. I have found focusmax and robofocus to be very good but it does require a very good smooth and stable focuser. The focus must be repeatable to achieve somewhere near good focus. I have takahashi rack and pinion focusers with almost zero backlash and still the results night to night can vary so much I have gone back to using robofocus with a Bahtinov mask and manually controlling the focus from the PC screen with bahtinov grabber.
I find using this method much more acurate overall and doesn't take much extra time in the long run.
I set up on a brighter star near the target, Insert the mask, do a focus, move to the target, synch the mount on the target, start imaging. After a few frames when the temp is changing or when I notice the FWHM changing I move back to the star and re-do my focus, move back to the image and start again.
This method definitely gives me more consistant results.
Temprature compensation is another mine field set to make life a missery.
Just my thoughts on auto focusing.
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