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| 600 II + 1.4xTC MkIII on 7D |
Peter, the first one seems to be a tad soft but the IQ of the last 3 shots is just fine. I tried that lens plus a 1.4X TC on my 5D Mark III and I am very pleased with the results, both IQ-wise and AF speed/accuracy. I know the limitation of my own strength, and I used a monopod for my shots . I haven't tried that combo on the 7D however.
Joshua, it's not the lens/TC combo, it is 7D (perhaps I should say my 7D) which is NFG with this combo.
I have done a fair bit of testing of the combo +1DX on some fairly challenging fast moving targets (see below), and everything worked reasonably OK.