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Canon Extenders II vs III

Started Jun 13, 2011 | Discussions thread
Tannin Senior Member • Posts: 1,510
Re: Canon Extenders II vs III

I can't comment yet on a direct comparison basis, but I've owned the 1.4 II for many years, and my new 1.4 III arrives tomorrow. It will be interesting to see what difference it makes (if any) with my 500/4 IS (the recently discontinued Mark 1).

I've already got a  new 2.0 III and tried it out briefly with the 500/4, using a 7D II last week. It is clearly superior in AF speed to the Mark II 2.0X I had for a while but sold years ago (back when I had a 1D III). How much of that improvement is down to the III converter and how much to the 7D II I cannot say.It's still too slow to be attractive for bird photography though.

I'll try the 2.0X on a 1D IV next time I'm out, but my first impression on the 7D II was not good. I might just sell it. I don't reckon the extra reach winds up delivering a better picture overall than just using a 1.4X and cropping.

As for the two different 1.4 converters, I'm not expecting much difference, but we will see. I plan to buy a 600/4 II reasonably soon, so I imagine that, even if it does nothing better on a 500/4 IS Mark 1, it's still worth keeping.

 Tannin's gear list:Tannin's gear list
Canon G9 X II Canon EOS-1D Mark IV Canon EOS 7D Mark II Canon EOS 5DS Canon EOS 5DS R +10 more
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