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Canon Extender EF 1.4x II

exef14_1_
Review Date: Aug 27, 2007 Recommend? yes | Price paid: Not Indicated | Rating: 10 

 
Pros: An excellent way to give me 700mm on my 500mm f/4 with no obvious deterioration in IQ when mounted on my 400D (XTi) or 1D Mk III.
Cons:
None really (but see comment below).

Have only used this on two lenses: my 500mm f/4 and my recently acquired 100-400mm zoom. I am a bit disappointed with the extender's performance on the zoom - it seems to slow down the AF on my Mk III and the shots look a little "soft". With primes I think it is excellent.