I have used my C925 a reasonable amount for AP, what I did find very beneficial was using an off axis guider. So far off the centre of the FOV the guide stars look terrible but it works.
I did find that any sort of focus activity and a large enough change in pointing showed up as mirror movement but I don't know if that would end up relating to having to toss out the occasional sub or having movement visible in lots of subs.
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