Notice on the last image, the moon, Ganymede, and the dark area going from the top right, down to about the center of the moon. Yes, its pretty small, but it is definitely there. This is the first time I've ever had the resolution to capture detail on one of the moons.
Equipment used: C6NGT (6", f/5), cascaded, Celestron 2X barlow, then a Meade 3X barlow feeding into the QC Pro 4000.
Stacked in Registax, wavelet sharpened, increased color saturation, adjusted brightness and contrast.