Using my 10D, I tried out two different 70-200 F2.8 IS

The other factor, and it may not be a major problem, would be how far away the people were, and where on them you were looking. When someone's walking, their arms and legs are moving "faster" than the body as a whole as they swing back and forth. If you were looking at them to evaluate sharpness while the camera was trying to get a focus lock on the torso they may well have been out of the zone of focus and showing some motion blurring as well This would be more pronounced if they're close in than if they're further away.

Good grief! You must much your way through compact flash cards. Shooting double or more images every time in AI Servo?

The trick is to hold the shutter button half down for about half a second to allow the camera to lock focus and then press the shutter button down fully to take the shot. Nice in focus shots and easy on the storage

Thanks to everyone for your comments

Cheers
jc

Cadwell wrote:
Good grief! You must much your way through compact flash cards. Shooting double or more images every time in AI Servo?

That's why they're called "chips"

:{)#

Canon does not guarantee focus on the first shot in an AI-Servo sequence and I've found that to be the rule rather than the exception with the 10D even when tracking for a half second before taking the shot.
Here, check out this article, section 3.A:

http://photonotes.org/​other/ai-servo.html

PacAce wrote:
Canon does not guarantee focus on the first shot in an AI-Servo sequence and I've found that to be the rule rather than the exception with the 10D even when tracking for a half second before taking the shot.
Here, check out this article, section 3.A:

http://photonotes.org/​other/ai-servo.html

LOL Don't bother quoting something at me, I know what works for me and what doesn't. I always shoot in AI Servo (motor racing) and I never shoot bursts. My percentage of in focus shots is very high, 90%+ and when it is out of focus or blurred it's usually my fault and I know what I have done to cause it (either snapped at the shutter or shifted the AF point on the target). There's maybe 4% of shots where I can reasonably blame the 10D for getting it wrong.

I did start off shooting bursts with the 10D when didn't know what I was doing but I soon realised that I was wasting my time (and compact flash card space). I get better results firing single shot.

Cadwell wrote:

PacAce wrote:
Canon does not guarantee focus on the first shot in an AI-Servo sequence and I've found that to be the rule rather than the exception with the 10D even when tracking for a half second before taking the shot.
Here, check out this article, section 3.A:

http://photonotes.org/​other/ai-servo.html

LOL Don't bother quoting something at me, I know what works for me and what doesn't. I always shoot in AI Servo (motor racing) and I never shoot bursts. My percentage of in focus shots is very high, 90%+ and when it is out of focus or blurred it's usually my fault and I know what I have done to cause it (either snapped at the shutter or shifted the AF point on the target). There's maybe 4% of shots where I can reasonably blame the 10D for getting it wrong.

I did start off shooting bursts with the 10D when didn't know what I was doing but I soon realised that I was wasting my time (and compact flash card space). I get better results firing single shot.

Whatever floats your boat, Cadwell. I wasn't looking to participate in an argument with you.