Thank you for your time guys, i appreciate it.
Im using sigma convertors i have both a 1.4 and the 2x
The sigma 1.4x works a treat on my 300mm and its my work horse setup! 95% of my stuff is taken using that setup. But when i put the 2x on it just wont autofocus at all, i was told that Nikon users dont have this problem.
just re reading this through and im starting to wonder why i need a 2x on the 70-200?? it gives me the same 400mm as im getting with the 300+1.4!!
maybe i should just get a second hand 1D instead!!!
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