Hey guys
So I got a 1d mkiv a few months back and since day one I have been disappointed with the AF when I use the 1.4 extender on my 500mm f4, with the bare the lens AF is fantastic but as soon as I add the extender most of my pics become out of focus. I use the extender with the 7D with no issues so I just would just like to know if this is normal or is there something messed up with my camera? I know with out the extender the center is a cross type AF sensor and at f5.6 its not is that the reason?
thanks







Reply With Quote

