A 100% crop from a RegiStax stack of 36 exposures of Jupiter and its moons, from left to right: Europe, Io, Callisto and Ganymede. (click "next" to see an upsampled 200% crop)
I used my Sigma 400mm f/5.6 HSM APO and Kenko 2 times teleconverter, making for a 35mm-equivalent focal length of 1280mm at f/8 on my Eos 70D.