John, I didn't know the 100-400mm is about 3" shorter, but it must be bulkier that's why I think the 400mm 5.6 is still smaller even it's a little longer, you actually reminded me that the 400mm 5.6 has another good thing is the built-in lens hood, very cool.


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), but unlike HDN's concern for his shaking, I believe my technique for hand holding a camera/lens is solid and allows me to drop to some lower shutter speeds w/out assistance of IS. 
