One of my disappointments in moving from the EF300 2.8 II to the EF 400 DO II was the MFD for the very uses suggested here. I'm toying with getting the 100 -400 but for my typical shooting it doesn't sub well for the DO (I'm at 800 a lot). That might be different if I had a high resolution sensor and so I wait and wonder what my next move will be. Now if $$ wasn't an issue ...
Jack
Jack
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