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UPDATE
The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being. I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure. ------------------------------------------------------------
Canon Rumors - Your best source for Canon news, rumors and creators
What's the real world impact of using aperture lenses of slower than f4 for portrait shooting or edge af on the 5d3/1dx? This really bugs me is that I have this 70-300L/4-5.6 around, and it seems even my 60d's edge af is "better" for this lens because all the outer points on the 5d3 will be only horizontal if I zoom in more than 100mm and the aperture goes beyond f4...