I don't use it with the 100-400mm, though I did use it once with liveview and it did add resolution - but I wouldn't recommend it. I bought the 2xTC to go with a 300mm f/2.8. Now, I use it with a 400mm DO II, where it is not too bad.Nice, it seems to enjoy it's lunch I'm fascinated about their color-scheme, it seems as if the body fluids are color-matched to look good behind the transparent body section? Yeah I know how evolution is supposed to work but sometimes I get the feeling that there was a designer (or possibly an engineer) involved, who did some experiments just for fun
By the way, I see that you have 2x TC III in your equipment list. How does it work together with EF100-400? I know there will be no AF but besides that, does it add any resolution compared to 1.4x TC?
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