Ergonomics? Those are long lenses. I can’t see wanting my left hand to come all the way back towards the body to adjust the control ring, while using lenses that long. The new bodies have enough controls to adjust the exposure triangle with your right hand. Even with the much shorter 100-400ii, it feels uncomfortable to adjust the control ring. For me at least.I still don't understand why Canon did not bother at least to "weld" a control ring adapter instead of just a basic one. These are $12K lenses and even the ultra cheap 50mm 1.8 has a control ring.
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