© 2015 KenRockwell.com. All rights reserved. Ergonomics performance topCanon EF 400mm f/4 DO IS II USM. bigger.This lens is all about ergonomics; it's easy to hold and shoot. I even can shoot one-handed if I have to for short period....
AF is fast, but remember that a 300mm lens takes longer to focus than a 200mm lens (or 70-200 at 200mm) because it has to cover the same range with much greater precisian due to the much thinner depth of field.AF is fast, even on my EOS R6 on an EF to RF adapter.AF ...