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| p.1 #13 · 5D Mark III + 100-400L + Kenko 1.4X DGX Autofocus? |
Thanks for all the comments!
IMO you will not be happy using a 1.4x TC on the 100-400, regardless of what body you use.
This is probably true, though I've been very happy with the bare 100-400 @400mm f/5.6 (I could not tell the difference between it and a 300mm f/4 IS + 1.4X II, or just the bare 300mm, except in the extreme corners). I am hoping to get a little extra resolution near the center with the teleconverter. I have looked at other options that are <$3000 but haven't found anything that will get me more reach on my 5D III and be acceptable for BIF (other than perhaps a used Sigma 500mm f/4.5, which I'm considering).
After hearing about many well respected users reporting that the TC worked at f/8, I ordered one from Adorama, and it arrived Friday.
I mounted it to my 100-400mm L and was very pleased to find that it autofocused very well at 400mm f/8, even in low light. AF was smooth and reasonably fast. It did hunt in extremely low light, but it was in the deep shadows after sundown where any camera would struggle to AF.
As soon as I find time, I'll be testing it with other bodies lenses, and TC combinations.
Thanks. This is the kind of feedback I'm looking for. I think I'm going to try and give the teleconverter a chance.