While it’s clear the rival 36-M-Pix Nikon D800 is a phenomenal camera with the highest pixel count available in a compact DSLR, the 22.3 Mpix Canon EOS 5D Mark III isn’t necessarily outclassed. While both share a similar HD video capability the 5D Mark III has a highly sensitive and accurate 61-point focusing system, durable pro-level build, excellent live view implementation, and can capture stills at up to 6fps (compared with 4.5 fps for the Nikon). In terms of pixel count and stills output, 36 Mpix to 22.3 Mpix sounds a lot but in real life conditions, it’s not as much as the figures suggest.
As you might expect, the image quality of the lens significantly affects the amount of detail that can be captured. In fact, when paired with certain lenses, and making very good use the sensor’s capabilities, the EOS 5D Mark III mounts a serious challenge in terms of resolving power or ‘Sharpness’ to the Nikon D800. Indeed, the two cameras are much closer than expected.
We have tested 85 individual lens models with the EOS 5D Mark III and assimilated a huge amount of data. Of those, we’ve measured 47 primes ranging in focal length from 14mm to 300mm. Breaking that down further, 17 are wide or ultra-wide angle including the new optically excellent Sigma 35mm f/1.4DG HSM A and Canon EF 35mm f/2 IS USM, the Canon EF 28mm f/2.8 IS USM and the exquisite but pricey Carl Zeiss Distagon T* 2,8/15 (15mm f/2.8) ZE. Standard and short telephoto lenses account for another 25 lenses, while a further 5 are telephotos (including 3 Canon models, two of those being exotic, pro-grade f/2.8 types).
Zooms may also be sub-divided into the same categories of wide-angle, standard and telephoto. Of the wide-angle zooms we have assessed 7 lenses including the current pro-offering from Canon, the EF16-35mm F/2.8L II USM as well as the Tokina AT X 16-28 F/2.8 PRO FX.
Standard zooms tested include the vaunted but pricey Canon EF 24-70mm f/2.8L USM II, the compact EF 24-70mm f/4L IS USM and the new surprise budget stabilized choice, the Tamron SP 24-70mm f/2.8 Di VC USD.
Finally, we have 20 telephoto zooms to consider data from, including the popular 70-200mm f4 and f/2.8 types, various 70/75-300mm and 2 super-zooms.
From our recent Nikon D800 overview it’s clear the camera is the leader in outright P-Mpix (Sharpness) and overall DxOMark scores, but the rival Canon EOS 5D Mark III is not as far behind as the pixel counts suggest.
We certainly wouldn’t advocate switching between them based on that alone. Indeed, with the right glass, the sensor in the Canon EOS 5D Mark III is capable of closing the gap between them in resolution to negligible values, and that other reasons for choosing between them may be more relevant or important.
Time will tell if the differences in price and features will weigh more heavily in favour of one over the other, but, some care must be taken when choosing lenses in order to maximise the potential image sharpness. As system cameras, working with several lenses, there are times when it’s important to know which lenses are capable of recording the highest levels of sharpness.
|Nikon D800||Nikon AF-S Nikkor 85mm f/1.4G||2199||40|
|Nikon D800||Nikon AF-S NIKKOR 85mm f/1.8G||690||40|
|Nikon D800||Sigma 35mm F1.4 DG HSM A Nikon||899||39|
|Nikon D800||Carl Zeiss Makro-Planar T 100mm f/2 ZF2 Nikon||1840||36|
|Nikon D800||Samyang 85mm f/1.4 Aspherique IF Nikon||328||36|
|Nikon D3X||Nikon AF-S NIKKOR 85mm f/1.8G||690||35|
|Nikon D800||Sigma 85mm F1.4 EX DG HSM Nikon||969||35|
|Canon EOS 5D Mark III||Sigma 85mm F1.4 EX DG HSM Canon||969||35|
|Nikon D3X||Nikon AF-S Nikkor 85mm f/1.4G||2199||34|
|Nikon D800||Nikon AF-S Nikkor 24mm f/1.4G ED||2200||34|
|Nikon D800||Sigma 35mm F1.4 DG HSM A Nikon||899||23|
|Nikon D800||Nikon AF-S Nikkor 85mm f/1.4G||2199||22|
|Canon EOS 5D Mark III||Canon EF 300mm f/2.8L IS II USM||6599||22|
|Nikon D800||Carl Zeiss Distagon T 25mm f/2 ZF.2 Nikon||1700||22|
|Canon EOS 5D Mark II||Canon EF 300mm f/2.8L IS II USM||6599||21|
|Canon EOS 1Ds Mark III||Canon EF 300mm f/2.8L IS II USM||6599||21|
|Nikon D800||Nikon AF-S NIKKOR 28mm f/1.8G||699||21|
|Nikon D800||Samyang 14mm f/2.8 IF ED UMC Aspherical Nikon||409||20|
|Canon EOS 5D Mark III||Sigma 85mm F1.4 EX DG HSM Canon||969||20|
|Canon EOS 5D Mark III||Carl Zeiss Makro-Planar T 100mm f/2 ZE Canon||1840||20|
|Canon EOS 5D Mark III||85||15||15||24||23|
When comparing the huge volume of data accumulated over measuring 147 lenses, one very surprising result was revealed. The average sharpness scores of the Canon EOS 5D Mark III matched the Nikon D800 and if the results were based solely on the mean average, the Canon actually out-performed the Nikon.
When using specific lenses (such as the new Sigma 35mm f/1.4 DG HSM A) the Nikon can out resolve the Canon. However, taken as a whole, the statistics reveal the EOS 5D MK III is capable of similar sharpness and of achieving a close DxOMark camera/lens score to the Nikon D800. Moreover, that’s despite the latter camera’s 60% extra pixel count.
Even the DxOMark mean and median scores can be explained by the small difference (-1/3 stop) in the Low Light ISO score between the cameras.
While the Nikon D800 is capable of getting the best from any lens that’s fitted, it is essential to select lenses specifically to maximise the potential resolution of the sensor. If you’re trading in a Nikon D3X, for example, you may want to confirm that your existing lenses are capable of meeting (or maybe even exceeding) your expectations.
While that same principle of choosing the best glass also applies to the Canon, it’s not quite as crucial. In financial terms alone, this may be an important consideration if you have already invested in a sizeable range of lenses. Lenses on the Canon EOS 5D Mark III are without doubt very efficient.
In future tests, it will be interesting to see if the Sony sourced sensor in the Nikon D800E variant with its altered (zero strength) OLPF (Optical Low-Pass Filter) is significantly more efficient at resolving detail or if it’s as a result of the differences in fill-factor (affected by RGB filter transmission, micro-lens design and circuitry) between the Canon and Nikon sensors.
Either way, the Nikon D800 sensor simply isn’t as adept at resolving detail, pixel-by-pixel, as the Canon EOS 5D Mark III. There’s another surprise as well.
Although the Canon EOS 5D Mark III has a different sensor with a slightly increased pixel count of 22.3 Mpix, against the EOS 5D Mk II’s 21.03 Mpix, the new Mark III can boast an average increase in Sharpness (P-MPix) of 15% over the earlier Mark II model (based on the measurement data from the 85 lenses tested).
Canon hasn’t simply delivered a sensor with a minor increase in pixel count; they’ve significantly re-worked the architecture to provide an increase in sharpness.
Studio and landscape photographers looking for advice may also be interested to know the new EOS 5D Mark III has improved sharpness, lens-to-lens, than the older, now discontinued 21.1 Mpix Canon EOS 1Ds Mark III.
|Sigma 85mm F1.4 EX DG HSM Canon||969||35|
|Sigma 35mm F1.4 DG HSM A Canon||899||34|
|Canon EF 100mm f/2 USM||440||33|
|Canon EF 35mm f/2 IS USM||850||33|
|Carl Zeiss Makro-Planar T 100mm f/2 ZE Canon||1840||32|
|Canon EF 300mm f/2.8L IS II USM||6599||32|
|Canon EF 85mm f/1.2L II USM||1869||31|
|Carl Zeiss Distagon T 35mm f/2 ZE Canon||1030||31|
|Canon EF 24mm f/1.4L II USM||1550||31|
|Carl Zeiss Distagon T 35mm f/1.4 ZE Canon||1843||31|
|Canon EF 24-70mm f/2.8L II USM||2299||28|
|Tamron SP 70-200mm F/2.8 Di VC USD Canon||1699||28|
|Canon EF 70-200mm f/2.8L IS II USM||2499||27|
|Tamron SP 24-70mm F2.8 Di VC USD Canon||1299||27|
|Canon EF 28-70mm f/2.8L USM||1269||24|
|Canon EF 70-200mm f/2.8L USM||1300||24|
|Canon EF 70-200mm f/2.8L IS USM||1695||23|
|Canon EF 70-200mm f/4L IS USM||1210||23|
|Sigma 70-200mm F2.8 EX DG APO OS HSM Canon||1699||23|
|Canon EF 16-35mm f/2.8L II USM||1399||22|
Given the somewhat lowly-looking pixel count of the Canon EOS 5D Mark III the potential sharpness is, surprisingly, one feature where the camera exceeds expectations. Providing the camera is matched to specific lens models, sharpness can even exceed the Nikon D800 under certain circumstances (when that camera is used with lesser capable lenses). This is great news if you’re looking to invest in one or own one already. If you’re a Canon user and are looking to upgrade, or maybe even switch because of the sensor’s perceived lowly capabilities then this should put your mind at rest. Please look out for next part of this review, where we’ll look at the finer points of the results for camera and lens combinations to choose from and those lenses that you may want to avoid.