Sony a7S III vs Canon EOS 1D X Mark III

This is a full comparison between the cameras Sony a7S III and Canon EOS 1D X Mark III. We compare them by looking at the categories you see below.

Sony a7S III

Canon EOS 1D X Mark III

Manufacturing

Sony a7S III is manufacturered by Sony but Canon EOS 1D X Mark III is from Canon. Both Sony and Canon are well known brands though.

These two camera models were both released 2020.

Camera	Released
Sony a7S III	2020
Canon EOS 1D X Mark III	2020

Type of camera

Sony a7S III is a Mirrorless camera while Canon EOS 1D X Mark III is a DSLR camera. More information about their differences will come soon.

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 a7S III	50 mm Full-frame sensor No crop factor/focal length multiplier
Canon EOS 1D X Mark III	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 a7S III has a 12 MP (Megapixels) resolution while Canon EOS 1D X Mark III has 20 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Sony a7S III	12 MP 12007680 pixels 4240 x 2832
Canon EOS 1D X Mark III	20 MP 19961856 pixels 5472 x 3648

Canon EOS 1D X Mark III has a 66 % larger resolution than Sony a7S III. 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

Sony a7S III has a larger ISO-range than Canon EOS 1D X Mark III. Sony a7S III has an ISO range that stretches from 80 to 102400 while Canon EOS 1D X Mark III has 100 to 102400.

Camera	ISO Range
Sony a7S III	80-102400
Canon EOS 1D X Mark III	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.

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Sony a7S III
Lens compatibility chart for Canon EOS 1D X Mark III

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a7S III can shoot up to 10 pictures per seconds and Canon EOS 1D X Mark III can shoot up to 20 pictures per seconds.

Camera	FPS (Frames per second)
Sony a7S III	10
Canon EOS 1D X Mark III	20

Ability to record movies

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

In this case, both Sony a7S III and Canon EOS 1D X Mark III 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.

Canon EOS 1D X Mark III weighs 1440 gr (equal to 3.17 lb) which is 106% heavier than Sony a7S III and its 699 gr (or 1.54 lb).

Camera	Weight
Sony a7S III	699 gr 1.54 lb
Canon EOS 1D X Mark III	1440 gr 3.17 lb