Canon 5D Mark III Review

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This is an in-depth review of the new Canon 5D Mark III, a highly anticipated DSLR update to the Canon 5D Mark II that was released back in 2008. Built on the success of the 5D Mark II and featuring the most advanced autofocus system Canon has released to date from its EOS-1D X line, the Canon 5D Mark III is a rather promising upgrade to the 5D line. With an enhanced image sensor with ISO 100 to 25,600 native ISO range, fully weather-sealed camera body, 6 fps burst shooting speed and dual card support, the 5D Mark III seems to target all kinds of photography – from landscapes and fashion to sports and wildlife photography. In this review, I will not only provide detailed information about the camera, but will also compare it to the older Canon 5D Mark II, the Nikon D3s and the new Nikon D800.

Canon 5D Mark III

I have been shooting with the Canon 5D Mark III for close to three months by now. I received it around the same time when I got a hold of the Nikon D800 and it has been a very interesting journey, shooting with both of these cameras side by side. As you may already know, I have been a Nikonian for a while now and most of the camera and lens reviews I have published to date cover Nikon products. Starting from earlier this year, I decided to expand my reach to Sony, Fujifilm and Canon cameras and lenses. While I personally prefer to stay focused on my brand of choice, some of the tests I perform compare performance across brands, so I decided that it would be best for me to get familiar with other camera systems as well. So far I have been enjoying this process and my overall impression at the moment is that all camera systems out there have their own advantages and disadvantages, just like I stated in my Nikon vs Canon vs Sony article, and no one camera system is superior than another. In short, no camera is perfect. I own a lot of Nikon gear and prefer shooting with it, because I started my journey into the world of digital photography with a Nikon DSLR. Had I started with a Canon or a Sony DSLR, my site would have been either Canon or Sony-centric instead.

Canon 5D Mark III Sample (2)

Canon EOS 5D Mark III + EF17-40mm f/4L USM @ 17mm, ISO 100, 1/400, f/11.0

As I have already stated in some of my articles, I have been really enjoying the Canon 5D Mark III. I had a great experience with its predecessor, the Canon 5D Mark II, which I used a number of times before (many of my photography friends use Canon gear and I get to play with Canon gear quite a bit). So when the 5D Mark III was announced, I knew that I definitely wanted to try it out as well, but this time for an extended period of time with a few top Canon L lenses. Loaded with Canon EF 24mm f/1.4L, EF 50mm f/1.2L, EF 17-40mm f/4L lenses, I have been taking the camera with me everywhere – from personal trips shooting landscapes and nature, to commercial jobs.

While reading this review, you might find a number of negative remarks about the camera. As I have said earlier, no camera is perfect and the Canon 5D Mark III is not an exception. There are things I love about it and there are things that I find rather annoying as well. It does not mean that the camera is bad and it certainly does not make it inferior to its main competitor, the Nikon D800. It is a matter of personal taste and preference. At the end of the day, it is not all about the image sensor, ISO performance or camera speed – one should assess a system as a “package”. A lot of what I say about the 5D Mark III is obviously from the standpoint of a long time Nikon shooter, so you will find plenty of comparisons and references to Nikon in this review.

1) Canon 5D Mark III Specifications

Main Features and Specifications:

  1. Sensor: 22.3 MP full frame CMOS sensor, 6.25µ pixel size
  2. Sensor Size: 36 x 24mm
  3. Resolution: 5760 x 3840
  4. Native ISO Sensitivity: 100-25,600
  5. Boost Low ISO Sensitivity: 50
  6. Boost High ISO Sensitivity: 51,200-102,400
  7. Sensor Cleaning System: Yes
  8. Image Processor: DIGIC 5+
  9. Autofocus System: 61-point high-density reticular AF (up to 41 cross-type points)
  10. Lens mount: Canon EF
  11. Weather Sealing/Protection: Yes
  12. Body Build: Full Magnesium Alloy
  13. Shutter: Up to 1/8000 and 30 sec exposure
  14. Storage: 1x CF and 1x SD (SD/SDHC/SDXC compatible)
  15. Viewfinder Type: Pentaprism with 100% coverage, 0.71x magnification
  16. Speed: 6 FPS
  17. Exposure Meter: 63 Zone iFCL Metering System
  18. Exposure Compensation: ±5 EV (at 1/3 EV, 1/2 EV steps)
  19. Built-in Flash: No
  20. LCD Screen: 3.2 inch diagonal with 1,040,000 dots
  21. Movie Modes: 1920 x 1080 (29.97, 25, 23.976 fps), 1280 x 720 (59.94, 50 fps), 640 x 480 (25, 30 fps)
  22. Movie Exposure Control: Full
  23. Movie Recording Limit: 30 minutes
  24. Movie Output: MOV (H.264)
  25. Built-in Microphone: Mono
  26. In-Camera HDR Capability: Yes
  27. GPS: Not built-in, requires GP-E2 GPS unit
  28. Battery Type: LP-E6
  29. Battery Life: 950 (CIPA)
  30. USB Standard: 2.0
  31. Weight: 860g (excluding battery)
  32. Price: $3,499 MSRP body only
Canon 5D Mark III Sample (7)

Canon EOS 5D Mark III + EF17-40mm f/4L USM @ 22mm, ISO 100, 25/10, f/11.0

A detailed list of camera specifications is available at

2) Canon 5D Mark III vs Canon 5D Mark II

What kind of changes does the Canon 5D Mark III bring to the table when compared to its predecessor, the Canon 5D Mark II? While detailed camera specification comparisons have already been provided in a separate Canon 5D Mark III vs 5D Mark II article, below is a short summary of changes and updates.

Canon 5D Mark III vs Canon 5D Mark II
  1. Sensor Resolution: 22.3 Million (5D Mark III) vs 21.1 Million (5D Mark II)
  2. Native ISO Sensitivity: ISO 100-25,600 vs ISO 100-6,400
  3. Image Processor: DIGIC 5+ vs DIGIC 4
  4. Autofocus System: 61-point high-density reticular AF (up to 41 cross-type points) vs 9-point TTL (1 cross-type point)
  5. Viewfinder Coverage: 100% vs 98%
  6. Storage Media: 1xCF and 1xSD vs 1xCF
  7. Speed: 6 fps vs 3.9 fps
  8. Exposure Metering Sensor: iFCL metering with 63 zone dual-layer sensor vs TTL full aperture metering 35 zone SPC
  9. LCD Size: 3.2″ LCD vs 3.0″ LCD
  10. LCD Resolution: 1,040,000 dots vs 920,000 dots
  11. HDR Support: Yes vs No
  12. Chromatic Aberration Correction: Yes vs No
  13. Silent shutter: Yes vs No

The above are the most significant differences – there are some other minor differences as well.

First, let’s talk about the camera sensor. While 22.3 MP vs 21.1 MP change might seem rather insignificant (nothing like the 24 MP jump from D700 to D800), the sensor on the 5D Mark III has gone through some interesting changes. Its ISO range has been expanded from 6,400 to 25,600 – two more full stops, as seen in product sheets and claimed by Canon. In reality, the situation is a little bit different, but I won’t disclose my findings quite yet, you will see my test results in the camera comparisons page of this review.

The autofocus system on the 5D series cameras has been a source of complaints for a while now. When the Canon 5D Mark II was released, photographers were disappointed by the fact that Canon was still bundling its old 9 point AF system with only one cross-type sensor, while Nikon was shipping its advanced 51 point AF system on even its cropped-sensor cameras like Nikon D300s. This time around, after hearing so many complaints from its customers, Canon finally decided to change the AF system on the 5D line. And the new AF system is not a joke – it is the same one that Canon is using on its top-of-the-line Canon EOS 1D X camera.

Framing images has gotten better, since the viewfinder finally offers 100% coverage. The LCD screen on the back of the camera has also gotten bigger with more dots to show more details. The DIGIC image processor gained some more power, which helped increase the speed of the camera from 3.9 fps to 6 fps (as a comparison, the Nikon D800 is limited to 4 fps). Faster speed means that the Canon 5D Mark III is now worth looking into as an option for sports and wildlife photography as well. A faster DIGIC 5+ processor also means that the Canon 5D Mark III can do some complex image processing – the camera can shoot in HDR and has built-in chromatic aberration correction, neither of which were possible on the 5D Mark II. Finally, the silent shutter of the 5D Mark III is a very useful feature when shooting in noise-sensitive environments.

As you can see, there is quite a difference between the two cameras. The AF system alone is a huge change.

Canon 5D Mark III Sample (14)

Canon EOS 5D Mark III + EF17-40mm f/4L USM @ 40mm, ISO 100, 1/50, f/5.6

3) Canon 5D Mark III vs Nikon D800

When it comes to comparing the two cameras, one has to be very careful in assessing sensor performance. Since there is such a huge difference in sensor resolution, looking at images at 100% view (pixel level) will obviously give advantage to the Canon 5D Mark III, simply because the latter has bigger pixels and hence its per pixel noise characteristics are going to be better. The proper comparison method, however, involves a down-sampling process, in which a higher-resolution image is resized to a smaller resolution. So in this case, the only proper way to compare the two cameras, is to take a 36.3 MP image from the Nikon D800 and decrease it to Canon 5D Mark III’s 22.3 MP resolution. This can be easily done in post-processing software like Photoshop and Lightroom and the comparison of the two, along with my personal analysis are presented in my Nikon D800 Review. In short, once down-sampled, the Nikon D800 yields exceptionally good images at high ISO levels and actually looks slightly better than the 5D Mark III at ISO 3200 and above. Lastly, the dynamic range of the Nikon D800 is phenomenal. According to DxOMark, the Nikon D800 has better dynamic range than all medium format cameras they have tested so far. The same cannot be said about the Canon 5D Mark III – its dynamic range is certainly inferior (see the “Dynamic Range” section of the review for more details). Let’s take a look at other differences in camera specifications – a full comparison is provided in my Canon 5D Mark III vs Nikon D800 article that I posted earlier.

Nikon D800 vs Canon 5D Mark III
  1. Sensor Resolution: 22.3 MP (Canon 5D Mark III) vs 36.3 MP (Nikon D800)
  2. Native ISO Sensitivity: ISO 100-25,600 vs ISO 100-6,400
  3. Boosted ISO Sensitivity: ISO 51,200-102,400 vs ISO 12,800-25,600
  4. Image Size: 5760 x 3840 vs 7360 x 4912
  5. Continuous Shooting Speed: 6 fps vs 4 fps
  6. Shutter Durability: 150,000 cycles vs 200,000 cycles
  7. Autofocus System: 61-point AF (up to 41 cross-type points) vs 51-point AF (up to 15 cross-type points)
  8. AF Detection: f/5.6 vs f/8
  9. Built-in Flash: No vs Yes
  10. AF Assist: No vs Yes
  11. Uncompressed Video Output: No vs Yes
  12. LCD Resolution: 1,040,000 dots vs 921,000 dots
  13. Battery Life: 950 shots (CIPA) vs 850 shots (CIPA)
  14. USB Version: 2.0 vs 3.0
  15. Weight: 860g vs 900g
  16. MSRP Price: $3,499 vs $2,999

Aside from the above-mentioned differences in sensor resolution and ISO performance, the Canon 5D Mark III has faster shooting speed, more AF focus points with more cross-type sensors (more on the AF system of the 5D Mark III further below), better LCD screen, better battery life and lighter body. On the flip side, its shutter durability is rated at 150K versus 200K on the D800, it has no built-in flash or AF assist for focusing in low-light environments, it has no uncompressed HDMI video output (only relevant to videographers) and it is $500 USD more expensive than the D800. In addition, the Nikon D800 can autofocus with lenses up to f/8, which means that if you have a slower f/4 lens, autofocus is still operational when a 2x teleconverter is used (certainly an advantage for wildlife photographers). Again, both have their pros and cons, so you have to weigh in which features are more important for your photography needs.

Canon 5D Mark III Sample (25)

Canon EOS 5D Mark III + EF50mm f/1.2L USM @ 50mm, ISO 100, 1/200, f/5.6

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