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| Re: UPDATE: Tested - 80-400 Vs 300 + TC Vs 70-200 + TC |
My 1.4x + 80-400mm required a pretty massive AF tune - +17. However, that does seem to be the optimal value (after +17 it drops off), so I'm comfortable with it.
After fine tuning, the performance is pretty reasonable within the parameters of what I expect out of it. It's a complex zoom with an aperture of f/5.6 getting a teleconverter put on it - so I had doubts that it'd be usable.
As it turns out, it's eminently usable. Shot in the D7100's 1.3x crop mode, then cropped more, at 560mm and wide open. This should be worst case, and I'd say it's damn decent: