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Hey Netwolf, focus is probably the trickiest thing about planetary imaging. I spend a lot of time going back and forward with an electric focusser (almost essential) waiting for those brief snaps of good seeing. Except under good conditions you should expect to see the cassini division come and go on the screen - so long as when it does come clear it looks reasonably sharp you should be OK. The shadow of Saturn's globe on the rings is another high contrast feature that's useful to focus on.
cheers,
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