Sony a7R IIIA vs Canon EOS R8

This is a full comparison between the cameras Sony a7R IIIA and Canon EOS R8. We compare them by looking at the categories you see below.

Manufacturing

Sony a7R IIIA is manufacturered by Sony but Canon EOS R8 is from Canon. Both Sony and Canon are well known brands though.

Sony a7R IIIA were released 2021 and Canon EOS R8 was released 2023. That is a 2 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Sony a7R IIIA 2021
Canon EOS R8 2023

Type of camera

Both these cameras are Mirrorless cameras. No difference there.

Sensors / crop factor

Even though the camera sensors might be called differently they are both considered Full frame which means that the focal length of the lenses is not affected. There is no crop factor on any of these cameras and sensors.

Camera Focal length, 50mm f/1.8 **
Sony a7R IIIA 50 mm
Full-frame sensor
No crop factor/focal length multiplier
Canon EOS R8 50 mm
Full-frame sensor
No crop factor/focal length multiplier

** Experienced focal length when using a lens such as a common "50mm f/1.8"

Learn more about crop factor and focal length multiplier here:
Camera selection can affect the focal length (Sony)
Camera selection can affect the focal length (Canon)

Resolution

Sony a7R IIIA has a 42 MP (Megapixels) resolution while Canon EOS R8 has 24 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels
Sony a7R IIIA 42 MP
42177408 pixels
7952 x 5304
Canon EOS R8 24 MP
24000000 pixels
6000 x 4000

Sony a7R IIIA has a 76 % larger resolution than Canon EOS R8. This could give you more details in the picture but also a possibility to crop more in the pictures, afterward while editing the pictures, if needed that is.

ISO range

Canon EOS R8 has a larger ISO-range than Sony a7R IIIA. Canon EOS R8 has an ISO range that stretches from 100 to 102400 while Sony a7R IIIA has 100 to 32000.

Camera ISO Range
Sony a7R IIIA 100-32000
Canon EOS R8 100-102400

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that support autofocus, do not have an autofocus motor of their own but this won't cause any problems with these two cameras.

Worth mentioning is that Canon EOS R8 belongs to the Canon EOS R-system and needs an adapter to work with Canons EF, EF-S, MP-E, and TS-E lenses. You can read more about this adapter here:
Canon Lens Mount Adapter EF-EOS R

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Sony a7R IIIA
Lens compatibility chart for Canon EOS R8

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a7R IIIA can shoot up to 10 pictures per seconds and Canon EOS R8 can shoot up to 6 pictures per seconds.

Camera FPS (Frames per second)
Sony a7R IIIA 10
Canon EOS R8 6

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

In this case, both Sony a7R IIIA and Canon EOS R8 can shoot movies.

Weight

The weight of the camera can be an extremely important factor, especially if the camera is about to be used, or carried around, for several hours at a time.

Sony a7R IIIA weighs 657 gr (equal to 1.45 lb) which is 43% heavier than Canon EOS R8 and its 461 gr (or 1.02 lb).

Camera Weight
Sony a7R IIIA 657 gr
1.45 lb
Canon EOS R8 461 gr
1.02 lb

Sony a7R IIIA vs Canon EOS R8 Specs

Below you will find the complete and detailed technical specs for both Sony a7R IIIA and Canon EOS R8, next to each other. Each category of data is a link to an article covering the subject, giving you a deeper understanding so you can better understand the strengths and weaknesses of the two camera models.

Product
Sony a7R IIIA
Canon EOS R8
Name Sony a7R IIIA Canon EOS R8
Manufacturer Sony Canon
Release Date and Price
Sony a7R IIIA
Canon EOS R8
Release Year 2021 2023
Release Date 2021-04-07 2023-02-08
MSRP 3199 USD 1499 USD
Buy it today
Camera Type
Sony a7R IIIA
Canon EOS R8
Camera Type Mirrorless Mirrorless
Sensor
Sony a7R IIIA
Canon EOS R8
Sensor Size Full Frame (approx 36 x 24 mm) Full Frame (approx 36 x 24 mm)
Sensor Type BSI-CMOS CMOS
Resolution 7952 x 5304 pixels 6000 x 4000 pixels
Megapixels 42 MP 24 MP
Image Processor BIONZ X DIGIC X
Image
Sony a7R IIIA
Canon EOS R8
ISO Range 100 - 32000 100 - 102400
White Balance Presets 10 6
Custom White Balance Yes Yes
Image Stabilization Yes
(Sensor-Shift (5-axis))
No
Image Stabilization CIPA Rating 5.5 stops 0 stops
Uncompressed format RAW RAW
Optics & Focus
Sony a7R IIIA
Canon EOS R8
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Focus Points 399 1053
Lens Mount Sony E

See Compatible Lenses
Canon RF

See Compatible Lenses
Focal Length Multiplier Full frame
No multiplier
Example:
24 mm remains 24 mm
50 mm remains 50 mm
100 mm remains 100 mm
200 mm remains 200 mm
Full frame
No multiplier
Example:
24 mm remains 24 mm
50 mm remains 50 mm
100 mm remains 100 mm
200 mm remains 200 mm
Screen & Viewfinder
Sony a7R IIIA
Canon EOS R8
Articulated LCD Tilting Fully articulated
Screen size 3” 3”
Screen dots 2360000 1620000
Touch screen Yes Yes
Screen type TFT LCD N/A
Live view Yes Yes
Viewfinder Type Electronic Electronic
Viewfinder Coverage 100% 100%
Viewfinder Magnification 0.78x 0.7×
Viewfinder Resolution 3686400 2360000
Photography features
Sony a7R IIIA
Canon EOS R8
Frames per second 10 fps 6 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/8000 seconds 1/4000 seconds
Built-in Flash No No
Built-in Flash Range N/A N/A
External Flash Yes Yes
Self-Timer Yes Yes
Time-lapse No Yes
Metering modes Multi
Center Weighted
Spot
Multi
Center Weighted
Spot
Partial
Exposure Compensation +/- 5 (at 1/3 EV, 1/2 EV steps) +/- 3 (at 1/3 EV, 1/2 EV steps)
Videography features
Sony a7R IIIA
Canon EOS R8
Video recording Yes Yes
Video format MPEG4
XAVC-S
AVCHD
H.264
H.265
Video resolution 1920 x 1080
3840 x 2160
1920 x 1080
3840 x 2160
Built-in Microphone Yes Yes
Built-in Speakers Yes Yes
Storage
Sony a7R IIIA
Canon EOS R8
Memory Card SD/SDHC
SD/SDHC
Connectivity
Sony a7R IIIA
Canon EOS R8
HDMI Output Yes Yes
Microphone Port Yes Yes
Headphone Port Yes Yes
Wireless Yes
Built-in (802.11b/g/n + NFC + Bluetooth)
Yes
Built-in (Wireless LAN (IEEE802.11b/g/n) (2.4 GHz)32, with Bluetooth 4.2 support)
Remote Control Yes (wired, wireless, smartphone) Yes. RS-60E3-type terminal (remote control terminal)
GPS No Yes
Optional via GP-E2
Body & Dimensions
Sony a7R IIIA
Canon EOS R8
Enviromentally sealed Yes Yes
Battery Battery Pack Battery Pack
Battery Details NP-FZ100 lithium-ion battery and charger
Rechargeable Li-ion Battery LP-E17
Battery Life (CIPA) 650 shots 220 shots
Width 127 mm 133 mm
Height 96 mm 86 mm
Depth 74 mm 70 mm
Weight 657 gram 461 gram