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Canon EOS 5D Mark III vs Sony a7R III Comparison

Storage & Battery

Canon EOS 5D Mark III

Canon EOS 5D Mark III

Sony a7R III

Sony a7R III camera image
Canon EOS 5D Mark III
Sony a7R III
Refers to the year this camera was officially made available for sale.
Announcement Date
Refers to the date the manufacturer publicly announced the upcoming release and general specs of this camera.
March 02, 2012
October 25, 2017
Camera Type
Camera Size
Camera Weight

The Sony a7R III outperforms the Canon EOS 5D Mark III with a score of 83/100 compared to 65/100. Both cameras share similar specifications, such as their announcement and release years, 2012 and 2017, respectively. The Sony a7R III, however, has a lower launch price of $3200, compared to the Canon EOS 5D Mark III’s $3499.

The winning Sony a7R III is a mirrorless camera, making it lighter at 657g and smaller with dimensions of 127 x 96 x 74mm. In contrast, the Canon EOS 5D Mark III is a DSLR camera, weighing 950g and measuring 152 x 116 x 76mm. Despite its higher score, the Canon still has some advantages, such as its sturdy build and long-standing reputation in the photography world.

Taking all these factors into account, the Sony a7R III is the superior camera due to its higher score, lower price, and more compact design, while the Canon EOS 5D Mark III remains a reliable choice for those who prefer DSLR cameras.

Canon EOS 5D Mark III vs Sony a7R III Overview and Optics

The Sony a7R III outperforms the Canon EOS 5D Mark III in optics, with a score of 84/100 compared to the Canon’s 67/100. Both cameras share some specifications, such as the CMOS sensor type, full-frame sensor size, and their respective proprietary lens mounts – the Sony FE and Canon EF.

The Sony a7R III excels with its higher megapixel count, at 42.4 compared to the Canon’s 22.3, providing greater image resolution. Additionally, the Sony has a faster shooting speed of 10 frames per second, compared to the Canon’s 6, allowing for better action and sports photography. The Sony’s Bionz X processor and DXOMARK sensor score of 100 contribute to its superior image quality. Furthermore, the Sony a7R III has built-in image stabilization, which the Canon lacks, enabling sharper handheld shooting.

The Canon EOS 5D Mark III, while not as strong in optics, has the advantage of the extensive Canon EF lens system, which offers a wide variety of lenses for various shooting scenarios. The Canon’s Digic 5+ processor, while not as powerful as the Sony’s Bionz X, still provides good image processing capabilities.

In comparing the optics of these two cameras, the Sony a7R III is the clear winner due to its higher megapixel count, faster shooting speed, better sensor score, and built-in image stabilization. However, the Canon EOS 5D Mark III benefits from the vast Canon EF lens system, which may be a consideration for photographers already invested in Canon gear.

The higher the number of megapixels, the more detail the cameras sensor can capture.
22.3 MP
42.4 MP
Image Resolution
Image resolution is measured in pixels and megapixels, width by height. The higher the number, the higher its resolution.
5760 x 3840 px
7952 x 5304 px
Sensor Type
The camera sensor captures light and records the image. Sensors vary in physical size, the number of pixels, and quality.
Sensor Size
The sensor size contributes to the overall quality as well as the dynamic and tonal range a camera can capture. As a rule of thumb, the more surface there is to read the light, the more information it will capture.
24 x 36 mm
24 x 35.9 mm
Sensor Format
Refers to the most commonly used sensor sizes.
Full Frame
Full Frame
Frame Rate
The number of sequential frames per second the camera can write to the memory card when shooting in burst or continuous mode.
6 fps
10 fps
Lens Mount
The lens mount will tell you what type of lens range you can fit onto the camera body. Often the same camera company will have different lens ranges for different cameras.
Canon EF
Sony FE
Image Processor
The image processor in the camera converts the information collected on the sensor for digital storage on the memory card.
Digic 5+
Bionz X
Aspect Ratio
The aspect ratio refers to the proportional difference between width and height. The most popular aspect ratios are 3:2 and 4:3.
Minimum ISO (Native)
Refers to the lowest native (or 'base') ISO setting. Lower ISO are less sensitive to light but make a cleaner image.
Maximum ISO (Native)
Refers to the highest native (or 'base') ISO setting. Higher ISO is necessary for low-light situations or night photography, but higher ISOs often introduce grain or noise.
Minimum ISO (Expanded)
Expanded (or extended) ISO is a digitally enhanced feature available on some cameras. It allows you to push beyond the native ISO range if necessary.
Maximum ISO (Expanded)
Expanded (or extended) ISO is a digitally enhanced feature available on some cameras. It allows you to push beyond the native ISO range if necessary.
Minimum Shutter Speed
The minimum shutter speed will tell you the longest exposure your camera can take without using an external accessory.
30 s
30 s
Maximum Shutter Speed
The maximum shutter speed tells you the length inside 1 second the camera will capture. These can sometimes be extended with accessories such as extra external batteries.
1/ 8000 s
1/ 8000 s
Autofocus Points
Autofocus points show where the camera is focusing graphically as squares or brackets in Live View or on an electronic viewfinder. These points are also used for light meter readings.
In-body Stabilization
In-body Stabilization means the camera has a certain technology embedded that counteracts camera shake.
Viewfinder Type
The viewfinder type is either electronic or optical. Electronic viewfinders will have a small screen in the viewfinder. Optical viewfinders will use prisms and mirrors to look through the lens.
Optical (pentaprism)
Viewfinder Resolution
3,686,400 dots

Canon EOS 5D Mark III vs Sony a7R III Video Performance

Comparing the video capabilities of the Canon EOS 5D Mark III and the Sony a7R III, both cameras have a video score of 56/100. Despite the similar scores, there are differences in their video specifications.

Both the Canon EOS 5D Mark III and the Sony a7R III lack built-in time-lapse functionality. The Canon 5D Mark III has a maximum video resolution of Full HD, with dimensions of 1920 x 1080, and can record at a maximum frame rate of 60fps. On the other hand, the Sony a7R III has a higher maximum video resolution of 4K, with dimensions of 3840 x 2160, but records at a lower maximum frame rate of 30fps.

The Sony a7R III is better when it comes to video resolution, offering 4K quality that provides more detail and clarity in video recordings compared to the Full HD offered by the Canon 5D Mark III. However, the Canon 5D Mark III has the advantage of a higher frame rate, which allows for smoother video playback and better slow-motion capabilities.

In terms of video capabilities, the Sony a7R III stands out with its 4K resolution, making it suitable for users who prioritize video quality and detail. The Canon EOS 5D Mark III, with its higher frame rate, is more suitable for users who require smooth motion in their videos, such as action or sports videographers.

Taking the specifications into consideration, photographers and videographers must decide which camera best suits their needs. The Sony a7R III is ideal for those seeking higher resolution, while the Canon 5D Mark III is better for users needing higher frame rates.

Indicates if this camera is capable of recording video.
Max Video Resolution
The best resolution this camera can capture video in. Modern cameras can capture up to 8K video.
Full HD
Max Video Dimensions
Video resolution measured by the greatest number of pixels possible in each frame, width by height. A higher resolution means more detail or clarity in your video.
1920 x 1080 px
3840 x 2160 px
Max Video Frame Rate
How many frames per second your video will capture. Most cameras have options for multiple frame rates, depending on the resolution you shoot in. For a general video, 24p or 30p is the standard, but more serious filmmakers may need a higher frame rate for creative effect.
60 p
30 p
Time-Lapse Built In
A built in time-lapse mode will allow continuous shooting throughout a prolonged period of time to be compressed into a sped up video.
Video File Format
Different cameras can record in various video file formats. The File format you record in can impact how you edit and use the files.
XAVC S, AVCHD Ver. 2.0, MP4

Canon EOS 5D Mark III vs Sony a7R III Features and Benefits

The Sony a7R III is the winner in terms of features, scoring 83/100, while the Canon EOS 5D Mark III scores 59/100. Both cameras have a screen, but the Sony a7R III has a smaller 3-inch screen compared to the Canon EOS 5D Mark III’s 3.2-inch screen. However, the Sony a7R III’s screen resolution is higher with 1,440,000 dots compared to the Canon EOS 5D Mark III’s 1,040,000 dots. Neither camera has GPS capabilities.

The Sony a7R III outperforms the Canon EOS 5D Mark III with its touchscreen, flip screen, WIFI, and Bluetooth capabilities, which the Canon EOS 5D Mark III lacks. These additional features make the Sony a7R III more convenient and user-friendly, as it allows for easier navigation, flexible shooting angles, and seamless connectivity with other devices.

The Canon EOS 5D Mark III has a larger screen, but this advantage is offset by its lower screen resolution and lack of additional features. The larger screen size does not necessarily provide a better user experience, as the Sony a7R III compensates with higher resolution and added functionality.

Based on these specifications, the Sony a7R III is evidently the superior camera in terms of features. Its touchscreen, flip screen, WIFI, and Bluetooth capabilities make it a more versatile and user-friendly option compared to the Canon EOS 5D Mark III. On the other hand, the Canon EOS 5D Mark III’s larger screen size is its only advantage, but it falls short in other aspects, making the Sony a7R III the clear winner.

Built-in Flash
A built-in flash will often be positioned right above the lens. This will automatically pop up when you activate it.
External Flash
External flashes are often connected through a hot shoe at the top of a camera, or a cable at the side of the camera.
GPS features in a camera will include location metadata to each of your photographs.
Weather Sealing
Weather sealing capabilities will give you more confidence when shooting in unfavourable conditions.
Screen Type
Touch Screen
Touchscreen allows you to change camera settings and access menus with a swipe of your finger, instead of using buttons.
Screen Size
Screen Resolution
Screen dots indicate the resolution of the LCD screen by including each sub pixel.
1,040,000 dots
1,440,000 dots
Flip Screen
A flip screen (or articulating screen) is a second screen which can flip out from the side or top of the camera. This rotating screen allows you more freedom to take photos at different angles.
Live View
Live View feature allows you to see a continuous live video of what is being seen through your lens.
Bluetooth capabilities allow you wireless control of your camera with other external devices.

Canon EOS 5D Mark III vs Sony a7R III Storage and Battery

The Canon EOS 5D Mark III outperforms the Sony a7R III in storage and battery, scoring 76 out of 100 compared to the Sony’s 65. Both cameras have two memory card slots and accept SD/SDHC/SDXC cards. However, the Canon also supports Compact Flash and UDMA cards, offering more storage options.

A significant advantage of the Canon 5D Mark III is its battery life, capable of capturing 950 shots compared to the Sony a7R III’s 650 shots. The Canon uses an LP-E6 battery, while the Sony uses an NP-FZ100 battery. Neither camera offers USB charging.

Although the Sony a7R III has a lower score in this category, it is worth noting that it is compatible with UHS-II SD cards, allowing for faster data transfer. This can be beneficial for photographers who need to quickly transfer high-resolution photos or videos.

To sum up, the Canon EOS 5D Mark III offers a longer battery life and more storage options, making it the better choice for those prioritizing storage and battery performance. The Sony a7R III, on the other hand, provides faster data transfer with its UHS-II compatibility, which may appeal to some users.

Storage and Battery
Storage and Battery
Memory Card
SD / SDHC / SDXC, Compact Flash, UDMA
SD / SDHC / SDXC (UHS-II compatible)
Dual Memory Card Slots
Battery Type
Battery Life
Approximately how long this cameras battery will last measured by how many photographs you will be able to take.
950 shots
650 shots
USB Charging
Sensor scores tested by DXOMARK
Overall Score
DXOMARK overall sensor score.
Portrait (Color Depth)
As described by DXOMARK 'The Portrait score in our camera sensor reviews defines color depth performance and its unit is a number of bits. A color depth of 22 bits is excellent; differences below 1 bit are barely noticeable.'
24 bits
26 bits
Landscape (Dynamic Range)
As described by DXOMARK 'The Landscape score in our camera sensor tests defines the maximum dynamic range of the camera sensor and its unit is an exposure value (EV). A value of 12 EV is excellent with differences below 0.5 EV usually not noticeable.'
11.7 EVs
14.7 EVs
Sports (Low-Light ISO)
Described by DXOMARK as 'The maximal value of ISO sensitivity needed to reach a given value of Signal-to-Noise Ratio (SNR). The greater the value, the better'

Alternatives to the Canon EOS 5D Mark III and Sony a7R III

Canon EOS 5D Mark III vs Sony a7R III Comparison image.

Are you still undecided about which camera is right for you? Have a look at these popular comparisons that feature the Canon EOS 5D Mark III or the Sony a7R III:

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B&H photo video
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