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thank you erick!
I think I understood that.
focused in on Saturn again.
There is enough room to wiggle left in the focusser when the 10mm is as sharp as it gets.
so (that part of ) the focusser can't be the cause.
the ring itself was clearer - as in: there was a visible tiny distance between the tiny bright blob and the tiny bright plane.
it was before moon rise in dark sky.
and: it hadn't rained for the previous 48 hours.
maybe, the speed of the scope is not meant for planets.
maybe, it's worth a try to focus in on ETA Catarina and see what there is to see - if anything. but I am not holding my breath, there.
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