D600 focus shifts under different light?

Started Oct 31, 2012 | Discussions thread
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jWaltman
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D600 focus shifts under different light?
Oct 31, 2012

I just upgraded from a D300s to a D600 and I noticed something peculiar with the autofocus behavior under different light. I’m wondering if anyone else has noticed something similar. Under daylight all of my lenses focus perfectly, but under warm tungsten light, my lenses backfocus. It seems to be more noticeable on wide lenses, my 24/1.4G being the worst offender. I took two images using a LensAlign focus target, AF-S, center point, focus priority and only changed the light between the two shots. One a daylight balanced light, the other a tungsten blub. There was certainly enough light as the AF assist light didn’t come on and the exposure was around 1/125th, f/1.4, ISO 100. I tried a few times, defocusing between tests, same time same result: the daylight shot was in focus, the tungsten shot backfocused. I pulled out my D300s to see if I had gotten similar results and just never noticed, but no, the D300s focus was the same regardless of the color temperature of the light.

I’m waiting to hear back from Nikon, but I’m curious if others are experiencing this or if it’s just me.

Here are some straight-out-of-the-camera JPEGs:

https://dl.dropbox.com/u/25777250/D600/Tungsten_Focus_Center.JPG
https://dl.dropbox.com/u/25777250/D600/Daylight_Focus_Center.JPG

Thanks for any insight any fellow D600 users can provide.

Nikon AF-S Nikkor 24mm f/1.4G ED Nikon D300S Nikon D600
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