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Also, an addendum, the best view of Jupiter i've seen through a 10" scope like ours was through John Bambury's, at Kulnura a few months ago. He was using a 2.5x powermate with a 10mm pentax XW (I think that was the combination) giving around 300x, but the seeing was very good that night.
I couldn't get the quite the same quality views through my scope at the same time because at that time, my secondary had astigmatism and my collimation was probably not as accurate as John's. Plus, I wasn't using the good quality barlow and eyepiece.
So it all makes a difference, but seeing is #1 priority.
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