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Canon EOS R5 vs Sony a7S III Comparison

Storage & Battery

Canon EOS R5

Canon EOS R5 camera image

Sony a7S III

Sony A7S III camera image
Canon EOS R5
Sony a7S 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.
July 30, 2020
July 28, 2020
Camera Type
Camera Size
Camera Weight

The Canon EOS R5 takes the lead with a score of 86/100, while the Sony a7S III trails behind at 74/100. Both cameras are mirrorless, announced in July 2020, and share similar dimensions. The Canon EOS R5 has a slightly larger size (138 x 98 x 88mm) and is lighter at 680g compared to the Sony a7S III’s dimensions (129 x 97 x 81mm) and weight (699g).

The EOS R5 outperforms the a7S III with its higher score, which reflects its better overall performance. However, the Sony a7S III has a lower launch price of $3499, making it a more affordable option.

Considering the scores and specifications, the Canon EOS R5 is the superior camera, but the Sony a7S III could be a good option for those on a tighter budget.

Canon EOS R5 vs Sony a7S III Overview and Optics

The Canon EOS R5 outperforms the Sony a7S III in optics, with a score of 88/100 compared to the Sony’s 69/100. Both cameras have a full-frame CMOS sensor, image stabilization, and are compatible with their respective lens mounts, Canon RF for the EOS R5 and Sony FE for the a7S III.

The Canon EOS R5 excels in several areas. It has a significantly higher megapixel count at 45 compared to the Sony’s 12.1, allowing for more detailed and high-resolution images. Additionally, the EOS R5 boasts a faster shooting speed of 20 frames per second, making it ideal for capturing fast-moving subjects. The camera’s Digic X processor contributes to its superior performance, and its DXOMARK sensor score of 95 further highlights the quality of its image output.

The Sony a7S III, despite its lower optics score, has its own strengths. Its Bionz XR processor is efficient and reliable, though not as powerful as the Canon’s Digic X. The a7S III’s DXOMARK sensor score of 86 is respectable, but not as impressive as the EOS R5’s score. The main advantage of the Sony a7S III is its lower price point, making it a more affordable option for those on a tighter budget.

Considering the specifications and scores, the Canon EOS R5 is the superior camera in terms of optics. Its higher megapixel count, faster shooting speed, and better sensor performance make it a standout choice for those seeking top-quality image output. However, the Sony a7S III remains a viable option for those who prioritize affordability over the highest level of optics performance.

The higher the number of megapixels, the more detail the cameras sensor can capture.
45 MP
12.1 MP
Image Resolution
Image resolution is measured in pixels and megapixels, width by height. The higher the number, the higher its resolution.
8192 x 5464 px
4240 x 2832 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.
23.9 x 35.9 mm
23.8 x 35.6 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.
20 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 RF
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 X
Bionz XR
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.
Viewfinder Resolution
5,760,000 dots
9,440,000 dots

Canon EOS R5 vs Sony a7S III Video Performance

The Canon EOS R5 outperforms the Sony a7S III in video capabilities, with a video score of 100/100 compared to the a7S III’s 77/100. Both cameras share some common specifications, including a max video frame rate of 120fps. However, the Canon EOS R5 has superior video resolution and built-in time-lapse functionality, contributing to its higher score.

The Canon EOS R5’s video resolution is 8K, with max video dimensions of 8192 x 4320, which is a significant advantage over the Sony a7S III’s 4K resolution and max video dimensions of 3840 x 2160. This means that the EOS R5 can capture much more detail and produce higher quality videos. Additionally, the EOS R5 has time-lapse functionality built-in, allowing users to create stunning time-lapse videos without the need for additional software or equipment.

On the other hand, the Sony a7S III, while lacking in video resolution and built-in time-lapse functionality, still offers an impressive max video frame rate of 120fps, matching the Canon EOS R5. This allows both cameras to capture smooth slow-motion videos.

When considering video capabilities, the Canon EOS R5 clearly outshines the Sony a7S III due to its higher video resolution and built-in time-lapse functionality. However, it is important to note that both cameras offer excellent video frame rates, making them suitable for various video projects. Ultimately, the Canon EOS R5 is the superior choice for those prioritizing video quality and versatility, while the Sony a7S III remains a strong contender with its matching max video frame rate.

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.
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.
8192 x 4320 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.
120 p
120 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.

Canon EOS R5 vs Sony a7S III Features and Benefits

The Canon EOS R5 outperforms the Sony a7S III in features, with a score of 87/100 compared to the Sony’s 83/100. Both cameras share common specifications, including a touchscreen, flip screen, WIFI, and Bluetooth. Neither camera has GPS functionality.

The Canon EOS R5’s superior features are evident in its larger screen size and higher screen resolution. The R5 boasts a 3.2-inch screen, while the Sony a7S III has a 3-inch screen. The R5’s screen resolution is an impressive 2,100,000 dots, significantly higher than the Sony’s 1,440,000 dots. These differences provide the R5 with a more enjoyable and detailed user experience.

The Sony a7S III, despite its lower feature score, still offers some advantages. Its slightly smaller screen size can make the camera more compact and portable, which may be preferable for some users. Additionally, the a7S III shares essential features with the R5, such as a touchscreen, flip screen, WIFI, and Bluetooth, ensuring that it remains a competitive choice in the market.

In comparing the Canon EOS R5 and the Sony a7S III, it is clear that the R5 takes the lead in terms of features. Its larger screen size and higher screen resolution enhance the user experience. However, the Sony a7S III remains a viable option for those who prioritize portability or appreciate its shared essential features with the R5. Ultimately, the choice between these cameras will depend on individual preferences and priorities.

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.
2,100,000 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 R5 vs Sony a7S III Storage and Battery

The Sony a7S III outperforms the Canon EOS R5 in storage and battery, scoring 76/100 compared to the R5’s 68/100. Both cameras share some common specifications, such as having two memory card slots and accepting SD/SDHC/SDXC (UHS-II compatible) cards. Additionally, both cameras offer USB charging capabilities.

The Sony a7S III holds an advantage with its extended battery life of 600 shots, compared to the Canon EOS R5’s 320 shots. This allows for longer shooting sessions without needing to change or recharge batteries. The a7S III uses the NP-FZ100 battery type, contributing to its superior battery performance.

On the other hand, the Canon EOS R5 supports both CFexpress cards and the LP-E6NH battery type. Although its battery life is shorter, the R5’s compatibility with CFexpress cards provides faster read and write speeds, which can be beneficial for demanding tasks like high-resolution video recording.

Taking these factors into account, the Sony a7S III proves to be more efficient in terms of battery life, while the Canon EOS R5 offers versatility with its storage options. This makes the a7S III a better choice for extended shooting sessions, whereas the R5 caters to users who prioritize speed and flexibility in their storage.

Storage and Battery
Storage and Battery
Memory Card
SD / SDHC / SDXC (UHS-II compatible), CFexpress
SD / SDHC / SDXC (UHS-II compatible), CFexpress Type A
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.
320 shots
600 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.'
25.3 bits
23.7 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.'
14.6 EVs
13.9 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'
Main Features
Extra Features
Construction and Durability
Handling and Ergonomics
Value for Money
Total Score

Alternatives to the Canon EOS R5 and Sony a7S III

Canon EOS R5 vs Sony a7S 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 R5 or the Sony a7S III:

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