Very nice first post. Welcome to CR
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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.
Lunch time farming!
I use the 1900mAh, it isn't a case of "getting away" with them, they are superb batteries that in my opinion offer the best results re longevity, recharge cycles, output and cost.