Beautiful! The colour problem's almost certainly due to the acro refractor - while my Mewlon's away for servicing I'm also using a 6inch synta acro refactor and experiencing the same issues though I haven't turned it on Saturn yet, just mars. Are you using any filtering? I stacked together a baader IR/UV and a WO minus violet filter to kill of both ends of the spectrum - this helps (might get rid of some violet fringing), but I notice when opening up the histogram tab in Registax that the R, G, and B lines are way out of alignment still. Thought of maybe recording in B&W mode through individually R, G and B filters and then combining might be the best way to get colour alignment and the best images from an acro.
Anyway, with Saturn, I like it - in some ways it enhances the image. Good Stuff.
cheers,
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