D800 Firmware Update Focus Improvement!

Started Apr 2, 2013 | Discussions thread
rhlpetrus Forum Pro • Posts: 24,890
Re: Personally, I find that there is still way too much hunting

Just a Photographer wrote:

m_appeal wrote:

even with the firmware update when I'm shooting portraits at f1.4/f1.8 too many OOF shots... tried a few fast primes wide open (85 1.8 G, Sigma 35 1.4). Could be user error of course, but I don't think so.

Who shoots portraits at f1.4? Not very commonly used IMO as the DOF is often much too shallow to get the eye and nose both correctly in focus. Or contrast detection AF might find that hairline/face is a better choice over the eye. 
I think you make common mistakes by not knowing how contrast detection of the AF system works. Try using 1.8 to 2.2. with your primes. I do that most of the times and I'll do it for good reasons...

Not only 1.4 is often too shallow for good focussed portraits, but also you'll have much more chance of any fringing. Sharpness is never 100% wide open therefore prefer taking portraits a little stopped down from wide. And yes I do only use quality primes .

Well, even if you are right (and you are, re portraits, in genearl), one should be able to shoot wide open with a prime and get the area under the AF point in focus, sistematically. One only needs to choose a large enough area with decent contrast and detail. And, now and then, you may want, for effects purpose, to have just the person's eye in focus, then f/1.4 may be the choice.

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