Sony a57 vs Canon EOS 1D X Mark III

This is a full comparison between the cameras Sony a57 and Canon EOS 1D X Mark III. We compare them by looking at the categories you see below.

Sony a57

Canon EOS 1D X Mark III

Manufacturing

Sony a57 is manufacturered by Sony but Canon EOS 1D X Mark III is from Canon. Both Sony and Canon are well known brands though.

Sony a57 were released 2012 and Canon EOS 1D X Mark III was released 2020. That is a 8 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Sony a57	2012
Canon EOS 1D X Mark III	2020

Type of camera

Sensors / crop factor

These cameras have different sensors. Sony a57 has a "Sony APS-C"-sensor while Canon EOS 1D X Mark III has a "Canon Full Frame"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

Camera	Focal length, 50mm f/1.8 **
Sony a57	75 mm Sony APS-C sensor Crop factor/focal length multiplier by * 1.5
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 a57 has a 16 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 a57	16 MP 16032768 pixels 4912 x 3264
Canon EOS 1D X Mark III	20 MP 19961856 pixels 5472 x 3648

Canon EOS 1D X Mark III has a 25 % larger resolution than Sony a57. 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 1D X Mark III has a larger ISO-range than Sony a57. Canon EOS 1D X Mark III has an ISO range that stretches from 100 to 102400 while Sony a57 has 100 to 16000.

Camera	ISO Range
Sony a57	100-16000
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 a57
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 a57 can shoot up to 12 pictures per seconds and Canon EOS 1D X Mark III can shoot up to 20 pictures per seconds.

Camera	FPS (Frames per second)
Sony a57	12
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 a57 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 133% heavier than Sony a57 and its 618 gr (or 1.36 lb).

Camera	Weight
Sony a57	618 gr 1.36 lb
Canon EOS 1D X Mark III	1440 gr 3.17 lb