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p.1 #1 · p.1 #1 · back button vs shutter button focus speed difference? | |
When shooting in AI Servo, and taking high speed continuous shots, will the camera/lens focus faster, and stay in focus better, with it set on back button or shutter button, or is there no difference?
The situation I'm referring to is when you have something coming toward you at a high rate of speed, and you're trying to keep them in focus the entire time. I have a sequence that I took, at a Supercross race last month, where I was doing just that, and noticed that some of the frames looked slightly out of focus compared to others in the sequence. I was shooting with a 7D and 70-200mm f2.8 IS Mark I and had it set for shutter button focus. I was using a single focus point, with focus point expansion. The riders were only traveling 30-40 mph, I'm guessing, but were coming straight at me.
I recently decided to try back button focus and I'm liking it so far. It just hit me though that maybe part of the reason why some of the pictures weren't as sharp was because of where I had the focus button set, since I was holding the shutter button down continuously.
Here are a few shots from the sequence to show what I mean. The first one was a few frames before the other two, but the second and third are back to back.
Supercross '14-68 by WStew302
Supercross '14-72 by WStew302
Supercross '14-73 by WStew302
Edited on Apr 11, 2014 at 08:30 AM · View previous versions
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