Advice re AF

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duggiebee

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I own a Canon 70 - 200 2.8L 11 and I love it to bits, but I find that the range can be slightly too short when I shoot certain types of sports and I end up heavily cropping the images. I have been tinkering with the idea of saving and getting a 100 - 400L but I was wondering if the new x2 extender would solve my issues?
The only question I have really, is, does the use of the extender effect the AF? I find that the AF on the 70 - 200 is fantastic and I would like to know if this is effected in any way? Does the AF even work with the addition of the extender?
 
I don't know if this is of any use but I used a Kenko 2x TC on my 70-200 f/2.8 with a 20D, and it was unusable. But, I dare say with a Canon TC on a better body... you might have more luck. I'd recommend you nip down to Jessops and try it out.
 
To answer your question................No, AF is not efffect. I have the Mk1 70-200mm 2.8 and I have been using a Canon 1.4 x TC ll but needed slighty more reach, so recently I got a Canon 2 x TC ll and so far, I think the IQ is very good. Before you fork out for the 100-400mm give this combo a go.

Ian
 
Keep an eye on this other current thread, which also asks the same question http://www.talkphotography.co.uk/forums/showthread.php?t=321670

I think the answer must be that AF is slowed with an extender, because Canon says it is, but the 70-200 Mk2 is so damn fast anyway (on a good camera) and the Mk3 extenders are also improved in this regard, so any difference has negligible practical significance.
 
OP doesn't say what camera body, but a lot of the bodies have AF points that are extra sensitive at f2.8 or lower which is a nice stealth buff of the f2.8 over the f4 70-200s so adding an extender you lose this extra sensitivity. Probably wont affect you much in real life tho.
 
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