Methodical wrote in post #11794304
Which camera? And what was the problem.
I did some low light testing between the Mk3 and Mk4 and the Mk3 did seem to lock faster, but I don't think I had really good targets though, but I am very impressed with the Mk4's 5000 and 6400 ISO shots I took. They looked pretty clean to me even before I did a light (very light - luminance set to 35) LR3 noise reduction.
I did this test already with my 1D4 (https://photography-on-the.net …p?p=11719858&postcount=57), and my 1D4 is back from Canon tomorrow.
When the 1D4 locked, it was great, and its high ISO is nice as well, very uniform noise, easy to clean, etc. However there are a few situations that I shoot where I want to have confidence in the low light focusing, and with my test above, if the 1D4 now focuses like the XTi does, I am good. If not, I guess I have to deal with the difficiencies by shooting in One Shot, but with kids, that won't yield the best results.