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That's exactly the symptoms I had, on the moons of Jupiter. It turns out that my secondary mirror was pinched in the holder (very tight) and was causing this. My primary mirror could also have been a bit looser.
So after rectifying both of these problems, and re-collimating, the moons of Jupiter are now pinpoints of light to me.
Hope that helps. Geoff has done a how-to on fixing this, but i'm yet to load it onto the main site. Will do so in the next day or two hopefully.
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