Hi Paula,
That is a very creditable image given the circumstances of Jupiter at the moment.
Unfortunately with the Neximage you are very heavily influenced by the seeing. With a 12inch, you should have plenty of light, so perhaps try the shortest exposure you can get away with. Don't be too worried about the brightness on screen, as it can be adjusted back up in later processing (within limits).
As Eric said, the recent seeing in Adelaide, while clear, has been terrible for fine detail. I guess the same might be so for Victoria.
Given that initial promising result, I think it would be certainly worth persisting and experimenting some more.
-Ivan
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