D800E supremely able autofocusing

Started 4 months ago | Discussion thread
Jim Keye
Senior MemberPosts: 1,523
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Re: D800E supremely able autofocusing
In reply to Leo360, 4 months ago

Leo360 wrote:

TOF guy wrote:

Leo360 wrote:

TOF guy wrote:

Leo wrote:

Astrophotographer 10 wrote:

(snip) some caves, often very dark and the AF worked almost every time.

you were shooting at f/2.8 aperture, right?


Directly from the Marianne's mouth

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

"Conclusion

Testing has demonstrated that AF is incapable of using any light rays passing through the lens, peripheral to the center f/5 aperture."

Leo

Correct. But it is also true that the aperture stays open until the shutter is actuated. (Otherwise you would lose viewfinder brightness.)

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