D800E supremely able autofocusing

Started Jan 20, 2013 | Discussions thread
Leo360
Senior MemberPosts: 1,036Gear list
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Re: Are you sure on this detail?
In reply to Leonard Shepherd, Jan 22, 2013

Leonard Shepherd wrote:

Leo360 wrote:

DOF as seen by Nikon AF sensors corresponds to f/5 aperture even when the actual picture is taken at f/1.4.

I am not convinced.

f1.4 lenses autofocus in several stops lower light that f5 lenses. This would not be possible if light reaching the autofocus sensor was restricted by an internal aperture no wider than f5.

Auto focus has moved on from a single autofocus point 20 and more years ago.

Many Nikon bodies illuminate 15 or more autofocus points from a single micro lens.

It is probable focus tracking using several autofocus points and Auto area AF now works by switching on and off individual detection cells on autofocus detection lines long enough to cover up to five viewfinder autofocus points. I accept Nikon do not comment on this.

If my presumption is correct and if there is an internal aperture with modern Nikon autofocus the aperture would need to be large enough to cover many viewfinder AF points. This implies wider than you're suggested f5.

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Leonard Shepherd
Many problems turn out to be a lack of intimate knowledge of complex modern camera equipment.

Leonard, you might find the following Marianne's experiments illuminating:

http://forums.dpreview.com/forums/post/50073569

http://forums.dpreview.com/forums/post/50092107

Leo

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