How accurate should one expect autofocus to be?

Started Mar 30, 2013 | Questions thread
rgolub
Senior MemberPosts: 2,054Gear list
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Re: How accurate should one expect autofocus to be?
In reply to SixtenB, Mar 30, 2013

SixtenB wrote:

Thank you. This was in fact the answer I was afraid of; that the AF can't be trusted to be accurate at ƒ/2.8

Oh, the AF will be accurate, but not much else will be.  Play with the depth of focus calculator at DOFmaster.   At 70 mm focal length, 5 feet from subject and f 2.8 your DOF is 3 inches.  Hard to expect a child to stay still enough to get everything framed and composed with that narrow of a DOF.

As has been mentioned, you can easily go to ISO 3200 on a D800.  It expands your world tremendously.

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RG
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