« on: December 21, 2012, 12:09:37 PM »
I sent in my 5D3 for a new shutter and I specifically complained about the AF assist beam causing slower focus. They did not admit there is a problem and after I got my camera back I looked through what they had done and they mentioned that they made electrical adjustments on the AF. I finally used it at a darkish event and at times I thought it was significantly better but after using it for two hours I came to the conclusion that it has the same old problem. I went around and found about 50 different places where the camera would focus instantly without the AF assist on my 70-200. I would then immediately switch the AF assist back and and try to take the same exact shot and noticed a significant lag (sometimes a second). After it is dark enough where AF is not possible then the AF assist is a benefit to me even if it does take over a second or two to focus so I would just like to keep it on. Instead I am turning it on and off several times during an event and it is a waste of time and not very efficient.