There have been some discussions online about an autofocus problem with the new Nikon D800 and D800E bodies, and there’s been a fair amount of misinformation about this problem published as well. It’s not at all clear how many D800/D800Es have this problem, but I’ve confirmed that my D800E does. This post is to document the problem and to help others determine for themselves if their bodies suffer from this as well.
Here’s the problem: If you autofocus using the far-left autofocus point (and ONLY the far-left autofocus point) your image will be slightly out-of-focus. My tests are below.
First, here is the focus test pattern, shown as a scaled JPEG from the full-frame image. The patterns are placed carefully to align with the leftmost, center and rightmost autofocus points. This particular set of tests was done using Nikon’s 24-70mm f/2.8 zoom set at 48mm and f/2.8. I repeated the tests with a 24mm f/2.8 prime with virtually identical results, but not shown here.
The superimposed images below are crops of the center test pattern. For the “before” image, I focused on the center pattern manually using LiveView. For the “after” image I used regular (non-LiveView) autofocus selecting the center focus point. (It’s hard to see, but there’s a vertical line in the center of the image with a draggable handle near the middle of the chart. You can move the slider left and right to hide and reveal the images.) As you can see, the images are virtually identical. Autofocus using the center focus point is accurate.
The superimposed images below are crops of the left test pattern. For the “before” image, I focused on the left pattern manually using LiveView. For the “after” image I used regular (non-LiveView_ autofocus selecting the leftmost focus point. As you can see, autofocus using the leftmost autofocus point is off. This is 100% repeatable using a variety of lenses.
I called the Nikon Service Center about this. The representative was initially vague until I told him I’d run these tests and had the results available. He acknowledged the problem and told me it’s correctable. I asked him whether I should return the camera to the retailer from which I purchased it or send it to Nikon for warranty service, and he recommended the latter. After all, there’s no guarantee a replacement wouldn’t have the same problem.
My new D800E is heading to Nikon tomorrow. Wish me luck!
Update 9/11/12: I didn’t get around to sending the D800E to Nikon in El Segundo, California, until 9/6/12, but Nikon’s online status page says Received 9/10/12. It’s now “In Shop” in Category B2: Moderate Repair: Major Parts Replace. The description of the problem includes “Optical Alignment”. It will be interesting to see what the actual fix turns out to be.
Update 9/17/12: Got the D800E back from Nikon today, so 11 days door-to-door. The work order merely said “Adjusted Autofocus” so who knows what they did. I had to leave for a trip and didn’t have a chance to test it, but I’ll give a thorough report next week.
Update 10/4/12: The camera is back from Nikon. See Part 2 for the results.View Printable Version