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Ferguson

Cape Coral, US
5701 posts

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"RE: Tempted by the D800"

Ferguson Silver Member Fellow Ribbon awarded for the generous sharing of his high level expertise in the spirit of Nikonians Nikonian since 19th Aug 2004
Sun 13-Oct-13 01:10 PM

>I just picked up a new D800. Can someone point me to a GOOD
>test for the left/focus issue? I still have a few weeks to
>return if need me.


Thom has a decent description here:

http://www.bythom.com/D800autofocus.htm

I disagree with him a bit on the fine tune aspect. I think you should do a center (center!) fine tune first before testing, so your overall results are not skewed if your center was off.

Here's one of the early reporters of the problem and his testing.

http://blog.mingthein.com/2012/07/03/how-to-tell-if-your-d800-d800e-d4-has-the-left-focusing-problem/

He does recommend AF fine tune if a consistent issue is shown, but I think he's a bit more extreme in his expectations that live view and AF should match exactly. AF is not precise. One can argue how imprecise it is, but I think everyone will recommend you do this many times on different subjects and look for a pattern, not a single bad case and stop. And bear in mind edge sharpness is naturally lower on many lenses, hence the live view comparison.

For me, I took a garage door, set up a tripod in front of the center at about 30' with a 14-24 lens (optically one of the best), three focus charts affixed in each focus point so I didn't have to move the camera, and did a bunch of testing.

The problem shows up by the left being dramatically different from the right. On my repaired camera, the left and right are similar, but significantly different from the center on some lenses, and about the same as the center on others. It will never be perfect, but the repair made it good enough that now I can use the left/right in portraits at F1.4 and not have one be worse than the other.


Linwood

Comments welcomed on pictures: Http://www.captivephotons.com

This is a hot, active topic! Tempted by the D800 [View all] , Lag , Sat 12-Oct-13 04:18 PM
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