Took some images of the eclipse we had a few days ago with my 600. They turned out pretty great, if I may say so myself.
Orion Atlas GEM
Canon EOS 7D
Canon EF 600mm f/4 L II
BackyardEOS (For image sequence acquisition)
ISO 100 @ f/8, shutter speeds from 1/250th to 15s.
Amazing photos. Congratulations!
And a little cheating I might say. The Atlas GEM helped in low shutter speeds - this is not the cheating I am talking about
- and the eclipse was visible from US - this is the cheating I was talking about