PAS de bol :sur un site connu : en anglais peut on traduire se qui se passe avec les objo ?

I will delve into these advantages in this Canon EOS 1D X review, but first, I want to point out a couple of potential downsides for 1D Mark IV body owners looking to upgrade.

First, the new Canon EOS 1D X, unlike previous 1-Series DSLRs, will not autofocus when using lenses or lens combinations with an f/8 max aperture. Chuck Westfall (Canon USA), through Arthur Morris, confirms this: "AF is unavailable on the EOS-1D X if the maximum aperture reported to the camera through the electronic lens mount is smaller than f/5.6."

This is of course disappointing to many extender users. Canon does not currently have a bare lens with a max aperture narrower than f/5.6, but adding a 1.4x extender to an f/5.6 max aperture lens results in an f/8 max aperture lens that will no longer AF. And, adding a 2x extender to an f/4 max aperture lens results in an f/8 max aperture lens that again will not AF