1D Mark III
Canon 1D X firmware update 1.2.4 released for download
Canon has been on a roll in recent times, as the company has released several firmware updates over the past few hours. Now, the EOS 1D X and the 1D Mark III have both received new upgrades. The latter is now compatible with the EF 200-400mm f/4L lens, while the former has had several of its bugs fixed among others.