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Which extender is best

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expatinasia:
On amazon.co.uk the Kenko 2x Teleplus PRO 300 DGX is £144.99 while the Canon Extender EF 2x III is a staggering £399.

Ironically, there are very few reviews on both, but the Kenko does seem to have a slight "stars" advantage over the Canon, though that may be due to the lower price.

Those about to purchase should definitely read the reviews though as there seems to be a few unhappy 100-400L campers on the Canon section.

neuroanatomist:

--- Quote from: expatinasia on December 27, 2012, 07:05:23 AM ---On amazon.co.uk the Kenko 2x Teleplus PRO 300 DGX is £144.99 while the Canon Extender EF 2x III is a staggering £399.

Ironically, there are very few reviews on both, but the Kenko does seem to have a slight "points" advantage, though that may be due to the lower price.

--- End quote ---

Before the 1D X firmware update providing f/8 AF, Art Morris blogged about getting AF at f/8 with the Kenko 1.4x on the 800/5.6L.  At that time, I had just received my 600/4L II, and really wanted to know if the Kenko 2x would allow f/8 AF with an f/4 lens.  I only found one comparison between the Kenko and Canon 2x TCs, on a birding forum. The guy had shot pics of a US$5 bill with both TCs behind a 500 II - with the Kenko, the bill was very soft, while the Canon 2x was sharp.  Still, it was only one review. I had planned to test the Kenko 2x myself, and in fact, had both the Kenko 2x and 1.4x (for AF with the 100-400) in my B&H cart...but before I got around to clicking Buy, the firmware update was announced, so I bought the Canon 2xIII instead.

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