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Canon EOS 1D X Mark III vs EOS R3 Comparison

Storage & Battery

Canon EOS 1D X Mark III

Canon EOS 1D X Mark III

Canon EOS R3

Canon EOS r3 Camera image
Canon EOS 1D X Mark III
Canon EOS R3
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.
January 07, 2020
September 14, 2021
Camera Type
Camera Size
Camera Weight

The Canon EOS R3 outperforms the Canon EOS 1D X Mark III with a score of 84 to 75. Both cameras share similarities, including being announced and released within a year of each other and having a similar price range, with the R3 priced slightly lower at $5999 compared to the 1D X Mark III at $6500.

The EOS R3 boasts advantages with its mirrorless design, resulting in a smaller and lighter body, measuring 150 x 143 x 87mm and weighing 1015g. On the other hand, the EOS 1D X Mark III, being a DSLR, is larger and heavier at 158 x 168 x 83mm and 738g.

Despite its size and weight, the 1D X Mark III remains a reliable and powerful camera, known for its durability and performance. However, the EOS R3’s higher score and more compact design make it a more appealing option for those seeking a balance between quality and portability.

Canon EOS 1D X Mark III vs EOS R3 Overview and Optics

The Canon EOS R3 wins in the optics comparison with a score of 84/100, while the Canon EOS 1D X Mark III scores 74/100. Both cameras share some common specifications, including a CMOS sensor, Digic X processor, and full-frame sensor size. However, there are key differences that contribute to the R3’s higher score.

The R3 has a higher megapixel count at 24 compared to the 1D X Mark III’s 20.1, which results in better image resolution and detail. Additionally, the R3 boasts a faster shooting speed of 30 frames per second (fps), as opposed to the 1D X Mark III’s 20 fps, allowing for improved action and sports photography.

The R3 also has a higher DXOMARK score for its sensor at 96, compared to the 1D X Mark III’s 91. This indicates better overall image quality and low-light performance. Furthermore, the R3 features a more advanced lens mount (Canon RF) and built-in image stabilisation, which the 1D X Mark III lacks.

Despite its lower score, the 1D X Mark III still has some advantages. Its Canon EF lens mount allows for compatibility with a wider range of lenses, especially for photographers who already own Canon EF lenses.

The R3’s superior optics make it the better choice for photographers seeking higher resolution, faster shooting speeds, and improved image quality. However, the 1D X Mark III may be more suitable for those who prioritize lens compatibility and are already invested in the Canon EF system.

The higher the number of megapixels, the more detail the cameras sensor can capture.
20.1 MP
24 MP
Image Resolution
Image resolution is measured in pixels and megapixels, width by height. The higher the number, the higher its resolution.
5472 x 3648 px
6012 x 4016 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 36 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
30 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
Canon RF
Image Processor
The image processor in the camera converts the information collected on the sensor for digital storage on the memory card.
Digic X
Digic 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
5,760,000 dots

Canon EOS 1D X Mark III vs EOS R3 Video Performance

The Canon EOS R3 takes the lead in video capabilities with a score of 96/100, while the Canon EOS 1D X Mark III trails slightly behind with a score of 91/100. Both cameras share some common features, such as a maximum video frame rate of 120fps and built-in time-lapse functionality.

The EOS R3 outshines the 1D X Mark III with its higher video resolution of 6K and larger video dimensions of 6000 x 3164. This advantage allows the R3 to capture more detail and produce higher quality video content than the 1D X Mark III, which has a maximum video resolution of 4K and video dimensions of 4096 x 2160.

Although the 1D X Mark III has a lower video score, it still offers high-quality 4K video resolution and shares the same maximum video frame rate and time-lapse functionality as the R3. This means that, despite its lower score, the 1D X Mark III remains a strong contender in the video department for those who may not require the extra resolution provided by the R3.

In comparing the video capabilities of the Canon EOS R3 and the Canon EOS 1D X Mark III, it is evident that the R3 holds the advantage due to its superior video resolution and dimensions. However, both cameras offer strong video performance, and the 1D X Mark III remains a viable option for users who may not need the additional resolution offered by the R3. Ultimately, the choice between these two cameras will depend on the specific needs and preferences of the user.

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.
4096 x 2160 px
6000 x 3164 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 1D X Mark III vs EOS R3 Features and Benefits

The Canon EOS R3 outperforms the Canon EOS 1D X Mark III in features, scoring 87/100 compared to the 1D X Mark III’s 74/100. Both cameras share several common specifications, such as a 3.2-inch touchscreen, GPS, and WIFI capabilities.

The EOS R3 surpasses the 1D X Mark III in screen resolution and versatility, with 4,150,000 dots compared to the 1D X Mark III’s 2,100,000 dots. This higher resolution provides the R3 with a crisper and more detailed image on its screen. Additionally, the EOS R3 has a flip screen, allowing for more flexible shooting angles and better self-portrait capabilities. The R3 also offers Bluetooth connectivity, which the 1D X Mark III lacks, making it easier to connect and transfer files to external devices.

On the other hand, the 1D X Mark III has no significant advantages over the R3 in terms of features. Both cameras have similar screen sizes, GPS, and WIFI capabilities, but the R3 outshines the 1D X Mark III in other aspects, as mentioned previously.

In comparing the two cameras, the Canon EOS R3 stands out as the superior option in features, offering a higher screen resolution, flip screen, and Bluetooth connectivity. The Canon EOS 1D X Mark III, while still a solid camera, falls short in these areas and does not have any notable advantages over the R3. Therefore, the EOS R3 is the better choice for photographers seeking a camera with more advanced features.

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
4,150,000 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 1D X Mark III vs EOS R3 Storage and Battery

The Canon EOS 1D X Mark III outperforms the Canon EOS R3 in storage and battery with a score of 87/100 compared to the R3’s 81/100. Both cameras share similarities such as having two memory card slots and using the LP-E19 battery type.

The 1D X Mark III excels with its longer battery life, providing 2850 shots per charge, while the EOS R3 only offers 760 shots. This significant difference makes the 1D X Mark III more suitable for extended shooting sessions without the need for frequent battery replacements. However, the 1D X Mark III lacks USB charging, unlike the EOS R3, which supports this convenient feature.

The EOS R3 displays versatility in its storage options, accepting both SD/SDHC/SDXC and CFexpress Type B memory cards, whereas the 1D X Mark III only supports CFexpress Type B cards. This flexibility allows R3 users to choose from a wider range of storage solutions.

Both cameras present unique advantages in storage and battery performance. The Canon EOS 1D X Mark III boasts superior battery life, while the EOS R3 offers greater storage flexibility and USB charging capabilities.

Storage and Battery
Storage and Battery
Memory Card
CFexpress Type B
SD / SDHC / SDXC, CFexpress Type B (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.
2,850 shots
760 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.'
24.1 bits
25 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.'
13.5 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'

Canon EOS 1D X Mark III vs EOS R3 Alternatives

User Scores
B&H photo video
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