How accurate should one expect autofocus to be?

Started Mar 30, 2013 | Questions thread
Truman Prevatt
Truman Prevatt Veteran Member • Posts: 8,164
Re: How accurate should one expect autofocus to be?

SixtenB wrote:

Now to my question: I'm having problems getting sharp photos. One typical example would be taking photos of my 2 year old. I set the camera at 70mm, 1/250 (she's never still), ƒ/2.8, AF-C, d9 area mode and keep the AF-point centered on her eye while keeping AF-ON depressed (I have disabled shutter half-press AF). I then wait a few seconds for the right moment and release the shutter. The result is a perfectly sharp eye (when viewed at 100 %) only in about 10 % of the cases. The rest are either significantly back- or front focused (seemingly at random).

I suspect your real problem is narrow DOF at 70 mm f2.8 and a moving subject in indoor lighting.

Take the kid outside and try it in natural light at 5.6 and see what happens.

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