Shooting in a zoo is to wild life shooting like shooting in a waxworks museum is to shooting a football match.I'm not really a wildlife shooter, unless you consider linebackers wildlife. But, I recently bought an EF 400mm f/2.8 and used it shooting theater on both my 1DXii and my R, and also took it to the zoo with my R attached for some "wildlife" shooting. I did not notice any issues with focussing whatsoever. Any limitations I have sensed with speed have been due to the limitations of the R body, not the adapter/lens. Having said that, I was extremely happy with my zoo pictures. Focus was amazing and detail on some birds was stellar.
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