I always found the 100-400 to be on the softer side on the 7D...that being said you shouldn't be having any problem getting sharp enough images for a.net with it...and really as long as you're hitting at least 1/400 you should be fine. I usually shoot between f/4 and f/6.3 and haven't had any issues. You're shooting the highest jpeg quality or RAW, yeah?
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