I know there's lots of moon shots in this forum, but I was just testing my 600L with 2x extender on the 7D, which almost fills the frame with the moon, and the detail it shows is very impressive. This is wide open (f/8 with the extender on) and I was going to test the improvement from stopping down, but the combination of strong wind and clouds put an end to my test almost as soon as it had begun.



