Canon 5D Mark III underwhelms on sensor test

It's Canon's top-scoring model on DxO Labs' image sensor test, but it's not much better than its 3-year-old predecessor, and it trails Nikon's D800.

(Credit: Sarah Tew/CNET)

Canon's EOS 5D Mark III is a hot item in the camera world. It's the successor to the vaunted 5D Mark II, which ignited the video SLR revolution, but with better autofocus, shooting speed and low-light performance.

Overall, the Canon EOS 5D Mark III edges out its predecessor, but the Nikon D800 remains the unquestioned king of the hill when it comes to performance in shooting RAW images.
(Credit: DxO Labs)

Alas for Canon shooters, though, the 22-megapixel image sensor doesn't rate much better than the 21-megapixel one in the 5D Mark II that arrived more than three years earlier, according to tests by imaging technology DxO Labs.

DxO gave the 5D Mark III sensor a score of 81 on the DxOMark test of image sensor performance when shooting RAW photos. That's an all-time Canon best, but it's only a bit ahead of the 5D Mark II's score of 79, and well behind that of the camera's top competition, Nikon's D800, which scores 95, topping the DxOMark list.

The D800 outpaced the 5D Mark III in all three of DxOMark's areas: colour depth, dynamic range and low-light performance. In particular, the 36-megapixel D800 is head and shoulders above the 5D Mark II in dynamic range at lower ISO, meaning it does a better job of capturing both darker shadows and brighter highlights.

Canon's camera edged out the D800 at high-ISO settings, though, and is a close match for image noise. Check below for some comparisons.

Not everybody shoots RAW, and videographers in particular don't even have the option, so DxO's tests don't paint a full picture. When it comes to the on-camera noise reduction used for JPEG and H.264 video, Canon asserts that the 5D Mark III outdoes the Mark II by about two stops, meaning that shutter speeds can be quartered, ISOs can be quadrupled or depth of field can be deepened without loss of image quality. The 5D Mark III can shoot video as high as ISO 6400, compared to 3200 for the 5D Mark II.

The DxOMark test only measures the sensor's performance. The overall camera quality also includes many other factors, such as autofocus, durability, burst shooting speed, lens selection, video performance, accessories, user interface and, of course, price. The Canon model costs AU$4399, compared to around AU$3500 for the Nikon.

Both models are full-frame cameras, meaning that the image sensor is the size of a 36x24mm frame of 35mm film. In comparison, most SLRs use smaller and cheaper "APS-C" sensors that generally don't afford as much image quality.

Next up will be seeing how Canon's flagship EOS-1D X compares to the Nikon D4. Current trends suggest that Nikon will win out here, too; the D4 has a DxOMark score of 89.

Nikon's D800 vaults far over Canon's 5D Mark III when it comes to dynamic range at lower ISO settings.
(Credit: DxO Labs)

The Canon 5D Mark III is a closer match for the Nikon D800 when it comes to controlling image noise.
(Credit: DxO Labs)

For higher ISOs, Canon's 5D Mark III does better than its predecessor when it comes to dynamic range — the ability to capture both dark shadows and bright highlights.
(Credit: DxO Labs)

The Canon 5D Mark III outperforms the 5D Mark II when it comes to avoiding image noise.
(Credit: DxO Labs)


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