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Originally Posted by Roy C  Today I went out with the Kenko and took about a 100 bird shots - I must say that the Kenko was very impressive and I reckon to be every bit as good as the Canon. When you consider the difference in price this is amazing. |
I've used three 1.4x converters with Canon lenses. First was a Sigma, then a Canon followed by the Kenko.
I didn't find any difference in either image quality or autofocus. Which is why I got rid of the Canon and bought the Kenko - would have been happy with another Sigma but there weren't 2nd-hand ones any for sale at the time!