Perhaps D4s is better ??
""Where we found the autofocusing to be problematic occurred during a Burlesque/Theatre performance that we went to where the lighting is equivalent to candle light and really not much else. To be fair and absolutely transparent, we were able to still shoot enough images that were focused well enough to please our clients. However, the focusing still wasn’t totally tack on when we looked at the images at 100%. Again, to be fair, clients won’t look at images at 100%.
Of the 297 images that we shot, we didn’t have as a keeper rate as high we usually do and part of that was due to inconsistent focusing problems. It also slowed us down many times and had us changing focusing spots to get the areas that were most in contrast instead of going for the eyes like many wedding/portrait/event photographers would do.
In comparison, the latest offerings from Sony and Olympus outperform the D810 in extremely low lit situations. Though during the day they are more or less neck in neck with Sony perhaps taking the shortest straw of the bunch.""
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Review: Nikon D810