Nice one all the same Mike. I reckon there is some mottling here that looks like "real" feature mottling in some of the images I've seen on the net, though I guess could easily be artifacts (how do you get the disk edges so sharp by the way?). If you get a night of cracking seeing and do a few shots over a couple hours could check to see if the mottling is moving the direction the planet's spin would have it...
