The D4 delivers excellent photo quality, with clean JPEGs through ISO 1600 and very good raw images through ISO 12800.
Lori Grunin
I've been reviewing hardware and software, devising testing methodology and handed out buying advice for what seems like forever; I'm currently absorbed by computers and gaming hardware, but previously spent many years concentrating on cameras. I've also volunteered with a cat rescue for over 15 years doing adoptions, designing marketing materials, managing volunteers and, of course, photographing cats.
The D4's JPEGs look clean as high as ISO 1600, are decent at ISO 3200 -- you can start to see some detail degradation -- and usable at ISO 6400, depending upon content. But rather disappointingly, the artifact profile for JPEGs doesn't look quite as good as the D3S' at sensitivities below ISO 12800.
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High ISO sensitivity JPEGs
Although better by the numbers than the D3S's JPEGs at ISO 12800 and above, I wouldn't suggest using the JPEGs beyond ISO 6400. On the upside, shooting raw yields significantly better shots at high sensitivities.
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ISO 800 JPEGs are quite clean. The pinkish cast is a result of the lights.
(1/100sec, f3.2, ISO 800, evaluative metering, 24-70mm lens at 29mm)
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ISO 800, no noise reduction
This is a 100 percent crop from the same image as the previous slide with no noise reduction. You can see some color noise, but it's extremely fine-grained.
(1/100sec, f3.2, ISO 800, evaluative metering, 24-70mm lens at 29mm)
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ISO 1600 JPEG
You can see some color noise in the dark areas of this ISO 1600 shot, but it's relatively subtle and looks good printed at 13x19. Processing the raw removes it entirely.
(1/125 sec, f6.3, ISO 1600, AWB, spot metering, 24-70mm lens at 70mm)
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ISO 3200 JPEG
ISO 3200 is the top sensitivity at which I can recommend shooting JPEG. You can see some color pattern noise in the sky, but it goes away when you use raw files.
(1/50 sec, f2.8, ISO 3200, AWB, spot metering, 24-70mm lens at 70mm)
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ISO 6400 JPEG
At ISO 6400 the color noise and oversmoothing in JPEGs becomes apparent.
(1/60sec, f10, ISO 6400, AWB, spot metering, 24-70mm lens at 70mm)
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ISO 3200 vs. ISO 6400 JPEG
In this crop from the same image as the previous slide you can see the significant decrease in image detail between ISO 3200 and ISO 6400 JPEGs.
(1/60sec at ISO6400, 1/30 sec at ISO 3200; f10, ISO 6400, AWB, spot metering, 24-70mm lens at 70mm)
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ISO 12800 JPEG
As I occasionally photograph feral cats, many of which only come out after sundown and who shy away from flash, good high ISO sensitivity performance is becoming increasingly important to me. So I wish the noise processing for ISO 12800 JPEGs were a little better; Nikon tends to err on the side of color noise over luminance noise. It looks fine viewed at 50 percent or smaller, though.
(1/160 sec, f2.8, ISO 12800, AWB, spot metering, 24-70mm lens at 70mm)
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ISO 12800 raw vs. JPEG
Though disappointed with the JPEG, I was quite impressed with the quick-and-dirty Adobe Camera Raw-processed version. It's soft, but much more usable and prints serviceably at 13x19.
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Shadow recovery
Before updating the firmware I had a big problem with the SB910 flash not firing, and ended up with several shots significantly underexposed shots (inset original). There's sufficient latitude in the raw files, however, to recover the image without introducing much noise and maintaining a lot of detail. Of course, it's not nearly as sharp as it would otherwise have been. But hey, you can't have everything.
(1/200 sec, f2.8, ISO 200, AWB, spot metering, 24-70mm lens at 70mm)
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Recoverable highlights
The D4's highlight recovery is good, but not exceptional. You can see some contouring in the clouds, for instance that's caused by desaturation in processing, not natural drama.
(1/200 sec, f11, ISO 200, AWB, spot metering, 24-70mm lens at 66mm)
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Color
Overall, the D4 renders accurate, nicely saturated colors. These were shot using the default Standard Picture Control setting.
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Picture Controls
The default Picture Control saturates hues a little, but doesn't push them into shifting. However, if you plan to shoot with it, you might want to push the contrast down a bit, as it can lose a fair bit of shadow detail. If you choose to shoot Neutral, you might want to bump up the sharpness a bit, though.
(1/100 sec, f20, ISO 200, AWB, evaluative metering, 24-70mm lens at 66mm)
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Auto White Balance options
As is becoming common these days, the D4 offers two different auto white balance settings, one option that balances for a "neutral" white (AWB1), and one that balances to preserve the color of a white illuminated by the predominant light source (AWB2). I like the capability and the results, but I wish there were a quicker way to jump between the two settings -- you have to choose which type of balance you want within the menus rather than as a white balance option you cycle through.
(1/100 sec, f2.8, ISO 800, spot metering, 24-70mm lens at 70mm)
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Autofocus
Focusing on the moving surface of a bubble is quite difficult, but the D4's continuous AF handled it pretty well, with only a few misses out of over 100 shots.
(1/80 sec, f4.5, ISO 800, AWB, spot metering, -1EV, 24-70mm lens at 70mm)
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Continuous shooting
As you'd expect, the D4 bursts crazy fast, even shooting full-resolution, minimally compressed raw+JPEG. You can see that it's fast enough to catch the bubble bursting in these two sequential photos.
I was shooting underexposed to guarantee I wouldn't lose the highlights and colors of the bubbles, which turned out to be too dark as the light was dropping rapidly. So I boosted the exposure back in the raws. These are partial crops to highlight the bubble.
(1/80 sec, f9, ISO 800, AWB, spot metering, -1EV, 24-70mm lens at 28mm)
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Autofocus while panning
This is from the middle of a 17-shot burst. Overall, I found the center-point, continuous AF more reliable than the other myriad options, because I could never be sure if they'd get distracted by the background. I'm a mediocre panner at best and I found about 50 percent of my shots acceptably focused, so in the hands of a more frequent panner I'd expect a significantly higher percentage of good ones.
(1/400sec, f5.6, ISO 100, AWB, center-weighted metering, 24-70mm lens at 70mm)
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Multiple exposure
Nikon has a nice, if initially confusing, multiple-exposure implementation. For instance, it can produce a raw file; that came in really handy here, since I'd accidentally left a negative exposure-compensation setting on from some previous shots.
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Bright, saturated colors
This shot is bright, but not necessarily overexposed (depends on your needs). The JPEG completely blows out the detail in the most saturated areas, but the detail is retained in the raw.
(1/125 sec, f6.3, ISO 100, AWB, spot metering, 24-70mm lens at 70mm)
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Sharpness
Overall, I found the camera lacked the naturalistic sharpness of a model like the D800, even at higher apertures and faster shutter speeds, but it can resolve midrange-distance details as well as you'd expect for the money.
(1/100 sec, f3.5, ISO 100, AWB, spot metering, 24-70mm lens at 70mm)