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['NEW Fix' UPDATE!] - MkIII AF still broken | |
lermite wrote:
- Center AF point only, pointing on a stationary subject, stable support (tripod or bean bag) --> the AF is continuously adjusting back and forth by a significant amount even if camera and subject aren’t moving at all. This results in a lot of out of focus images (even at f8), as with wildlife you haven’t always the time to switch to One Shot mode. (The MkIII white paper states: " Even if AI Servo AF is used to focus on a still subject, stable control is enabled so that the lens drive isn’t constantly fine-tuning. If the subject starts to move, the focusing responds immediately to detect the subject constantly.”).
My photography (sports, corporate, events) isn't quite the same as yours but I found that after installing firmware 1.2.3 the issue of AI Servo twitch dropped off considerably, though not completely gone. Certain of my lenses, particularly the faster ones and the 50 f/1.2L in particular, still cause substantial AI Servo twitch. But with lenses like the 70-200 f/4L, 400 2.8 IS or 600 IS, the camera is much calmer and doesn't feel like it's trying to focus on every molecule of air between it and the intended subject.
One note that might interest you: You can quickly switch between AI Servo and One Shot by setting CF III-6-4 and using the AF stop buttons on the big IS tele lenses. Personally I prefer III-6-5 to enable IS start and remove AF start from the shutter release so I can lock AF by letting go of the AF-ON button (I actually reverted back to the * button).
- The slower a subject moves the less reliable is the AF tracking. I had rather good results at 10fps testing on cars driving towards me on a motorway at 120km/h, but with 4fps and birds slowly flying, walking or swimming towards me, more than half of the images are out of focus.
Yes, I found this too and Rob Galbraith has also reported it. I noticed it in photos of people walking or running at a slow pace. Those tend to have a higher number of out of focus images in a sequence. I can't say I've found a solution for it...
Ron
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