It was one month ago today that I started this thread. Since then I've used my Mark III for: (1) Newborn Portrait Session (2) Family Portrait Sessions (1) Wedding and countless images of my daughter :-)
Observations:
One-Shot Focus:
The auto focus is phenomenal. Having points where I need them has been clutch to making images at wide apertures. It's also easy to switch between points without having to take your eye away from the viewfinder.
I noticed this too on a few occurrences. However, when using the Mark II I ALWAYS used the center focus point whereas on the Mark III I NEVER used the center focus point. Next time I will use one of the (5) dual cross-type points to see if that would make a difference. Also, I was using 430EX IIs on both bodies and it can only support up to 9 focus points. I am not sure which ones they would translate to on the Mark III but it's very likely that they were providing little to no help.Originally Posted by shizam1
AI Servo Focus:
I ended up using this for most of the wedding reception. With low-light, fast glass and wide-open apertures I was thrilled with the results. On the Mark III I was using the 85mm L @ f/1.4 and the 135mm L @ f/2 with great results. Most of the time I was using AF point expansion.
Spot AF:
I rarely (if ever) use this which does surprise me. I have had such great success with both single-point and expansion that it has not come up. I could see using it though when you are dealing with a lot of textures and contrast that could easily confuse the AF system.
Metering:
I actually use Av more than M which for me is a revelation!
High ISO:
To my eye it handles high ISO (>= 800) better than the Mark II. I think anywhere from 1/2 to 1 stop of improvement is realistic.
Disclaimer:
I am not a reviewer, just an observer. I do shoot almost daily though and in a wide variety of situations. I would be happy to answer any direct questions about my experience using either the Mark II or the Mark III.
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