I also have a 16-35 L and have used the 400mm 2.8 L. The 400 is such a great lens, just can't justify the cost for what I do.
I almost bought a 7d while in Detroit, they had if at Costco so I figured I'd pick it up when I got home. When I returned to Ca. Costco didn't have it. I'm now looking for a used 5ds mkIII.
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