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Hello, Mike. Unlike the other Mike (our host extraordinaire) I do tend to use a filter when viewing Jupiter. The reason for that is that if I stick my eye to the eyepiece for any length of time and then withdraw to ease my back I find that I'm blind in my viewing eye for a short while. That, though, is not to say you should use a filter. I've read that some people prefer a particular 'coloured' filter for Jupiter and, although I've tried a couple of the 'el-cheapo' varieties, I don't seem to see any particular aspect better than without such.
Oh, yes; I just use the 'moon filter' (it seems to be reasonably neutral) to cut down the glare.
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