Originally Posted by
shizam1
Well, my wife and I were shooting a wedding, and I had two 5DII's and 1 5DIII, so I thought I would stick to the old reliable technology until we got to the reception and then bring out the 5DIII since it's supposed to be better at low light and AF.
So at this reception, which was inside a restaurant and pretty dimly lit, we had a 5DII and 5DIII, and we were swapping lenses back and forth for some testing. We had an 85 f/1.2L II, 50 f/1.4 and 35 f/1.4L at the reception area.
After reviewing the wedding photos, and since I had accidentally shot one on aperture priority, I know the lighting was around ISO 1600, f/2.2 and 1/30 shutter speed (from memory, not in front of photo right now ).
At some points, it was taking 2-3 seconds to achieve focus on the 5DIII! So yeah, I missed some shots of the bride hugging guests. So I took up the 5DII, and was getting exactly the same result, or maybe (gasp) even faster. I didn't have any duplicate lenses, so couldn't do a simultaneous shot, but I was swapping lenses back and forth and trying different lenses and getting the same result.
I was just a bit dissapointed that I wasn't getting faster than 5DII results in that low light scenario!
Others have mentioned, and I noticed this in some subsequent basement low light tests, that focus seems to be achieved, but then it pauses for .5-1 seconds before giving confirmation.
At the wedding, I was using one-shot mode, with center point selected, and the AF-Expansion with 4 points. In my basement tests I switched back and forth between that and just center point, but didn't notice much of a change.
Anyway, I'm curious if he sees anything similar, and if there's some mysterious AF setting I'm not doing correctly or what not.