So I was wondering if this was just me, but the AF seems to hunt for a while before finding the lock.
The 5DIII has a raft of AF settings that will definitely have a bearing on your results, depending on what it is you are shooting. Get them back to default and then experiment. With the correct AF settings for the job you are doing, the 5DIII should easily out-perform your 7D.
Maybe you are using AI Servo where One Shot may be more appropriate. Or try using a selected AF point rather than trusting the entire auto 61 AF point array. In my experience, in most circumstances a selected AF point will deliver more keepers than leaving the decision up to the AF brain. You're the boss.
Thanks for this Paul. I should have been a little more clear, you're right. I work in nightclub, and have learnt not to trust anything other than centre point with the AF. I also only shoot in single shot, as I like to choose the focus, and then compose the shot.
I think what I am really waiting for it for the lock. It seems to find the focus ok(ish), but the hesitates to find the lock. I am used to waiting for the VF to flash up red to confirm this (I have switched it from auto to enable, so it's not a case of it achieving a lock, and me not realising) before moving the to re-compose.
After finding what I think, it thinks is focused, the time the camera 'hesitates' is just long enough for the subjects of the photo to become self conscious, and look at each other a the moment is lost.
I am aware there is a setting in the AF setup to prioritise on shutter release, over focus, but I don't this is an option as I like to choose my focus, then re-compose.
I aware that the lighting is terrible in most nightclubs, but I have the 580ex2 and have never has this same AF lock 'lag' before with the 7D. Just a little upset with it really.
I wasn't needing anything better than the 7D AF wise, that's not the reason for the purchase. I just really wanted a FF 7D.
After reading about the 5Dmk2 AF woes, I thought I would hold out for this MK3. And am just wondering really if the 'massive AF improvement' is 'massive' compared with 5dmk2, but possible a little step back, from what I consider a faultless 7D's AF system.
Sorry for the essay, but wanted to be as specific as possible to try to clear this up
The AF in the 5DII for the centre point was best of class with a f/2.8 lens. For shooting in low light I would highly recommend a lens f/2.8 or faster to get the best AF