Box Brownie
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True, but if you look at the manual you will find a 100-400 MK1 with 1.4mk 1 extender has a very limited number of AF active points and only the centre one is cross type. To take full advantage on the sensors you need latest generation lenses and/or extenders when using telephoto lenses.
Matt
I will have download the manual and see what it says, as I have the 100-400mm mk2 and the x1.4TC mk3
