To my eyes, it looks like the resolution in your image is down to features in the 2km range. My guide lists Curtius at 95km and Simpelius at 70km. Another superb shot.
Last edited by Shark Bait; 20-10-2013 at 07:27 PM.
I see Damian Peach had been using the ASI 220MM for pictures of the Moon in 2013 - see his website - very tempted to take the plunge and see what it's like for myself at a very decent price.