Hey Alex,
I find focus really hard to judge too. When the seeing is bad the planet blurs in and out of focus all the time so you have to judge the ponit at which it is in focus for the highest percentage of the time.
I've only had one night of reasonable seeing since starting imaging early this year where I was able to see the planet clearly focused on the computer screen most of the time - hence my avatar.
I can't see any stars in Brisbane at the moment. I'll be really amazed if you are able to get another Jupiter image tonight!
Take care,
Doug
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