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D800 focusing issue saga

rplst8

Johnstown, US
150 posts

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"RE: D800 focusing issue saga"

rplst8 Silver Member Nikonian since 18th Dec 2008
Thu 15-Nov-12 09:25 PM

>Any camera that has a non-apochromatic lens exhibit this
>problem. Color wavelength differences create different focus
>convergence position when passing through lenses commonly seen
>as color fringing. Color temperature affects focus in a
>similar way, since the path through the lens, the mirror and
>focusing sensors changes with wavelength, but to a lesser
>extent, although enough to see in with a high enough
>resolution sensor like the D800. Your D300 no doubt does not
>have the resolution to see it.

I understand that most lenses have this problem. It's beside the point.

Whether the D300 has enough resolution to see this is another matter. If we restrict the discussion to the DX frame the D7000 has more resolution than the D800 and doesn't suffer this problem. However it has a different auto focus area. The D300 has nearly the same AF area as the D800 and only 15% less resolution. Therefore, my claim as stated before is that the D300 does indeed have enough resolution to see these problems.

One thing I will say is this: when you have an example of the D800 that suffers from the asymmetric focus problem, the results achieved with the poorer focus points are well, well below the equivalent resolution of the D300. That is, it would be overwhelmingly obvious even to a D300 user.

Finally, in my examples, I had to reduce the resolution of the image from the D800 down below 2 MP in order to "mask" the focus error. In fact, even at 2 MP, the acutance was not as good as a properly focused image reduced to the same resolution.

--
RL

Visit my Nikonians gallery and my Flickr page.

This is a hot, active topic! D800 focusing issue saga [View all] , aay , Tue 06-Nov-12 02:06 AM
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