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Martin
The image reminds me of what mine looked like when I first started planetary imaging with an 127mm Achro refractor. Getting that fringing when using an Newt, Televue Powermate dslr combo is a bit strange. Could only come from collimation, focuser alignment problems but even if your collimation was out a little I would suspect that it is more a focuser issue, as Alex noted, where the camera , powermate set up at an angle, is twisting the drawtube enough to cause the alignment to be less than desirable.
A lighter weight dedicated planetary ccd camera would not be so demanding on the imaging train, but that is more expense. Always more expense involved in anything to do with astro imaging unfortunately but many people have taken video of the planets with similar equipment to yours and have not had the fringing problem. Comes back to weight , alignment issues it seems.
I was also out at that time of the morning taking Jupiter for the first time this year, the seeing was pretty ordinary, rippling and jumping around.
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