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That's good to hear you had a great night Bill. I liken your eyes receptors to a camera chip. I find the longer I look at something the more the image gets burned into my vision. I watched the Io transit, and I was seeing a lot more by the end of the transit. It was in those moments of good seeing that I saw lots of fine detail and no doubt the same was probably happening for you.
I have an ND filter I sometimes use on the moon, I don't use it on Jupiter though. I think you need all the light you can get to see the surface detail. But hey, there's no reason why you shouldn't get one and see for yourself.
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