As you guys know, I've been testing a Canon EOS-1D Mark III for a few weeks now. Last week I finally got out to test it in its element - action photography. One night I shot some mountain bike dirt jumping and yesterday I shot a cyclocross race. For the dirt jumps I pretty much shot as I normally would, without messing much with the custom functions - and there are a lot of them. Yesterday I started playing with the custom functions to see if I could fine-tune the auto focus the camera to better capture racers in motion.
The EOS 1D Mark III offers a huge number of customization options. The most compelling to me are changing the frame rate, fine tuning the auto focus speed and accuracy, and changing the auto focus button and activation options. When I shot the dirt jumpers I played with the capture rate a bit. The high speed is 10 frames-per-second. That's really, really fast - too fast to be practical for most of my purposes. Since you can customize the frame rate in the custom functions menus, I changed the slow speed rate to 6 frames-per-second (default is 3 FPS). I was also curious about how well 6 FPS would be since I've got an original 8 FPS EOS-1D, and I want to see how practical the upcoming EOS 40D's 6.5 FPS frame rate will be.
Since I did get missed shots due to the auto focus not keeping up, yesterday I used the EOS-1D Mark III's AF Maicroadjustment custom function. This was actually one of the most exciting features for me when the camera was introduced. I used it to adjust the AF forward a bit so that the camera would naturally lead my subject. I have't used a camera yet that didn't focus behind a racer when they['re moving fast, close, and towards me. I don't really think this is a camera failure, and there are techniques to compensate for it. But the ability to adjust the AI Servo AF so that the camera compensates for me is great. And it did seem to help. At the beginning of the day I had a lot of shots that were soft when I used AI Servo. After I made the adjustment, I had a lot more keepers. It's possible that I was warming up and getting more accurate. But I think the AF Microadjustment really helped.
So far so good with the EOS-1D Mark III. I do think it's got a lot of improvements and performs very well. I upgraded the firmware to the 1.1.0 version to make sure I had Canon's latest auto focus updates. So far I haven't seen any behavior that I would consider failure. I'm very pleased. And I'm getting close to wrapping up the review. I'll be sorry to have to send the camera back to Canon![]()