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What is the focal ratio (or focal length) of your 8"? For a typical f6 8" a 10mm eyepiece will be more than enough to show you the rings. It is possible to see Cassini's division through a cheap 4" newt.
It's hard to believe that an 8" could be so badly miscollimated and still produce a focussed image.
Maybe it's a case of expectation management; are there any clubs in your area or public observatories?
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