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| p.1 #1 · Canon 1D MK3 Auto-Focus Technique |
I was wondering if anyone could shed some light on techniques to track a subject, say a soccer player. I noticed that, even though the AF point was dead on the subject, many shots were out-of-focus because the player had turned around. I don't know if it's just a coincidence or just how the AF algorithm works. For example, while tracking a player facing in one direction, when suddenly the same player turns to shield the ball away from a defending player, the camera seems to easily lose focus because to the sensor the subject "no longer looks the same" and loses focus (when setting CFn III-2 default tracking sensitivity and CFn III-4 to '1' continuous expansion). Can anyone confirm/deny my observation? In those scenarios, I've learned to re-acquire focus as the player turns. While that's not so bad, I also lose a lot of good shots since the AI servo needs about a second to lock.
I always shoot @ full 10fps burst mode at least 1/2000th to "freeze" action. Still, the out-of-focus situation seems to occur more frequently when the subject turns away from the original tracking path. Re-focusing (releasing and pressing the back focus button) periodically seems to fair well...
Edited on Aug 10, 2012 at 08:28 PM · View previous versions