70-200 f/2.8L IS II & TC 1.4III vs 300mm f/4 L IS
- By mackguyver
- EOS DSLR
- 19 Replies
I have used both 70-200 IS (f/2.8 II & 4) with the Mk II and III extenders and have found no difference in terms of AF. I have only used the Mk III with the Mk II 300 f/2.8 so I can't comment on the differences there, though.Maximilian said:I have heard but not personally tested that the v3 converter should have a significant improvement in AF speed over the v2. Maybe someone can confirm this by personal experience.whothafunk said:I tried the 1.4xII (yes, version 2) with my 70D and 70-200L f2.8 and while I was satisfied with the IQ, i was not nearly satisfied with the AF.neuroanatomist said:Personally, I'd choose the 70-200 II + 1.4xIII for the better IS and AF with similar IQ.
I also cannot believe, that the 70D should be the limiting factor.
I have experience with 5D3 and v3 converter and here the AF speed slows down a little, but not so much that it would limit me in normal situations (not high speed or BIF tracking).
I guess what I was saying is that from my experience, the 70-200 (f/4 IS & f/2.8 IS II) both work very well with the Mk II & III extenders and if you're not happy with the AF performance, it's likely the camera body (or your AF settings - sorry I didn't mention that earlier). It's one of my favorite combos and I've had great results with it AF and otherwise with bodies ranging from the XSi/450D to the 1D X, so I found your post surprising. I don't believe the 70D is any better than the 7D in terms of AI Servo, but to be fair, I haven't used one. The 5DIII and 1D X bodies are noticeably better, but at quite a price, of course.
What AF settings did you use? Maybe that's the culprit.
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