Home » Insights » Canon Extender EF 1.4x III & Extender EF 2x III

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daysailer (unregistered) wrote on
08/29/2010 - 20:02.

dorkman53 wrote:

I certainly hope that these extenders will be compatible with the 70-200 f/4 IS and the 100-400 IS.  Does anybody know for sure whether autofocus will work with these lenses.  Obviously, they don't work with the II series, but is the III series able to do this?   Definite word would be welcome here, rather than best guesses. 

Canon still hasn't released all info as per EF / EF-S lens compatibility yet. 

So the answer for now is maybe, and maybe not.

Stay tuned. 

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