In-Depth Look at Canon EOS 1D X Firmware Version 1.1.1 - EF 70-300 L Officially Not Extender Compatible

The Canon Digital Learning Center has published an article on the just-released Canon EOS 1D X firmware version 1.1.1.
 
As I expected would be Canon's position on the question, the Canon EF 70-300mm f/4-5.6L IS USM Lens is officially not compatible with the Canon EF 1.4x III Extender.
 
As discussed here, the 70-300 L was initially included in the 1D X's f/8 AF-capable lens and extender combination list on the new Canon 1D X special firmware page. This lens is no longer included on that page - and is not included on the CDLC firmware in-depth page's compatibility list.
Posted: 10/20/2012 7:14:28 AM CT   Posted By: Sean
Posted to: Canon News
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