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Most won’t need this one.
Canon has released a firmware update for the EOS-1D Mark IV.
- EOS 1D Mark IV
Firmware Version 1.1.1 incorporates the following change.
- Optimizes the camera’s exposure accuracy when using EF 24mm f/2.8 IS USM and EF 28mm f/2.8 IS USM lenses, which are scheduled for release in June 2012. If these lenses are used with an EOS-1D Mark IV camera that has not been updated with the new firmware, the image may be overexposed depending on the subject and shooting scene.
The new Firmware Version 1.1.1 can be downloaded by clicking here.