Its not unusual for a new camera to have a firmware update shortly after release. Canon has just posted such an update for the 5D Mark lll. You should definitely download and install this update if you own a Mark lll, and should check the firmware version in any Mark lll you purchase in the future, to be sure that the latest version is installed. There appear to be some Mac OS X Firmware Updater limitations, so OS X 10.7 (Lion) users please read to the end of this article for details.
FROM CANON:
Firmware Version 1.1.2 incorporates the following improvements and fixes.
1. Supports a new accessory, GPS receiver GP-E2.
2. Fixes a phenomenon where a pink cast may develop over the image when the shutter is completely pressed with the camera’s power turned off (by the auto power off setting).
3. Fixes a phenomenon where the camera operation stops after one shot when shooting in High Dynamic Range (HDR) mode.
4. Fixes a phenomenon where the Shooting Date/Time in the EXIF data of the image shows a later time than the actual shooting time.
5. Fixes the time zone for the Samoa Islands.
6. Corrects errors in the Finnish menu screen.
Downloading the EOS 5D Mark lll Firmware Update is a fairly straightforward process. But the link to get to the Drivers & Software page does not always trigger the list of available content as it should. If you get a blank page, between the list of pages (Overview, What’s in the Box, Brochures & Manuals, etc) and the footer (prices and specifications may vary…) back up a screen or two and try again. If that still fails, then try a different browser. You can also check that a popup survey window hasn’t been missed, which is stalling the loading of the page content. Once you have the list of contents available, the bottom of the center section should contain Drivers and Software. Downloading will take a bit of time, since this is about an 18mg file.
Please note that this firmware update is listed as being available for Mac OS X 10.5 and 10.6, but not for 10.7; which is Lion, Apple’s latest Mac version. Since firmware resides in the camera, not the computer, this leads us to assume that the Firmware Updater used to install such updates has not yet been updated to function under 10.7, unless Canon has made an error. Since all our systems are updated to 10.7, this required borrowing a 10.6 MacBook Pro for the update process, since firmware updating is a fairly serious matter, and disregarding Canon’s recommendations would not be advisable, even if it is possible.
Firmware Update NOT Available for OS X 10.7 
- Firmware update available, for 10.5 and 10.6
This shows you how to acquire the update, if you are under Lion, since it won’t show if you list that as your OS version. Please feel free to leave comments if any further news on Lion compatible firmware updates becomes available. If you are viewing this article from the blog’s main page, click on the article’s title to enter the article itself, where comments will be visible.
UPDATE: People are reporting success with loading the memory card with the disk image for the firmware update from OS X 10.7, and even OS X 10.8 beta. I find it hard to believe people are willing to play Russian Roulette with bricking their new $3500 camera bodies, but its reassuring to hear that they are getting away with it…
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