Berkley White has posted some thoughts and demo video from early video testing of the Canon 5D Mark III in the cenotes of the Yucatan, Mexico. He was using a “hacked” housing which gave him limited access to controls, but found that the high ISO performance was far superior to that of the 5D Mark II in terms of noise. He debates the pros and cons of the new ALL-I video codec and finds that the 6fps frame rate and improved autofocus on the new camera rectify significant weaknesses in its predecessor. He concludes:

“And while it may be hard to distinguish between the 5D II clips and 5D III clips in the video above, you’ll be able to get the shot with the Mark III in conditions where you just simply couldn’t pull it off with the 5D Mark II.”