ISO Accuracy
The actual sensitivity of each indicated ISO is measured using the same shots as are used to measure ISO noise levels, we simply compare the exposure for each shot to the metered light level (using a calibrated Sekonic L-358), middle gray matched. We estimate the accuracy of these results to be +/- 1/6 EV (the margin of error given in the ISO specifications).
In our tests we found that measured ISOs from the Nikon D5200 matches the marked ISOs within 1/6 stop accuracy, meaning ISO 100 indicated = ISO 100 measured.
Noise and Noise Reduction (JPEG)
This is our standard studio scene comparison shot taken from exactly the same tripod position. Lighting: daylight simulation, >98% CRI. Crops are 100%. Ambient temperature was approximately 22°C (~72°F).
Note: this page features our new interactive noise comparison widget. By default, we show you the default noise reduction settings of the camera tested, and three other models of the same class. You can select from all available NR options, and from other cameras. The 'tricolor' patches beneath the familiar gray/black/portrait images are taken from the same test chart, and show how noise impacts upon blue, green and red areas of a scene.
Compared to...
Here, we're looking at the D5200's noise performance compared to its predecessor the D5100 and two of its closest competitors, the Canon EOS 650D / Rebel T4i, and Sony SLT-A57.
Compared to its predecessor the D5100, the D5200 gives very similar levels of visual noise at its low and medium ISO settings, but above ISO 6400, images are noticeably smoother by comparison. In terms of noise, there's not much to choose between the D5200 and its closest competitors the Canon Rebel T4i and Sony SLT-A57 but the higher pixel count of the D5200 does result in fractionally more detail at ISO 12,800 and 25,600. Switching to the graph view, the D5100 and D5200 give very similar measured noise until ISO 6400, at which point (and beyond) the D5200 gives lower measurements.
The Sony SLT-A57 boats very impressive noise measurements but this is due to noise-reduction, which is more aggressive than the Nikon and Canon cameras in this comparison. You can see this in the 'samples' view, especially at ISO 6400 and above, where the A57's output is distinctly hazy. Even with noise reduction turned to 'low' the A57's output is pretty mushy above ISO 3200.
Raw noise (ACR 7.3, noise reduction set to zero)
Here we look at the RAW files processed through Adobe Camera Raw (in this case version 7.3). Images are brightness matched and processed with all noise reduction options set to zero. Adobe does a degree of noise reduction even when the user-controlled NR is turned off.
The amount of NR applied 'under the hood' is not high, but it does vary by camera (Adobe is attempting to normalize output across different sensors), so inevitably we are still looking at a balance of noise and noise reduction, rather than pure noise levels. However, the use of the most popular third-party RAW converter is intended to give a photographically relevant result, rather than simply comparing sensor performance in an abstract manner.
In Raw mode, the differences between the D5200's image quality and that of the three other cameras in this comparison is more subtle. We're presenting these images with ACR noise reduction turned down to zero, and up to ISO 3200 there isn't much to choose between them from the point of view of critical image quality. The D5200's 24MP sensor gives more detail though, although the difference between the Nikon and Canon's T4i isn't as great as the 6MP disparity in pixel count might suggest. The Canon holds its own until ISO 12800, where noise swamps detail to the point where the 24MP D5200 just has the edge in terms of detail reproduction (but only just).
Switching to the graph view, it's clear that the four cameras in this comparison are indeed on a pretty level playing field. The Canon Rebel T4i gives slightly higher measured noise than the other models, but the difference is pretty minimal until ISO 3200, at which point a wider gap emerges higher up the ISO scale. The D5200, D5100 and Sony SLT-A57 give almost identical measured noise results with the exception of a slight dip in measured noise from the A57 at ISO 6400.







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