Nikon D3 vs Canon EOS R

This is a full comparison between the cameras Nikon D3 and Canon EOS R. We compare them by looking at the categories you see below.

Manufacturing

Nikon D3 is manufacturered by Nikon but Canon EOS R is from Canon. Both Nikon and Canon are well known brands though.

Type of camera

Nikon D3 is a DSLR camera while Canon EOS R is a Mirrorless 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.

** 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 (Nikon)
Camera selection can affect the focal length (Canon)

Resolution

Nikon D3 has a 12,1 MP (Megapixels) resolution while Canon EOS R has 30 MP. If we break down this in more detail this is the data behind the numbers:

Canon EOS R has a 150 % larger resolution than Nikon D3. 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 R has a larger ISO-range than Nikon D3. Canon EOS R has an ISO range that stretches from 100 to 40000 while Nikon D3 has 200 to 25600.

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 R 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 Nikon D3
Lens compatibility chart for Canon EOS R

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Nikon D3 can shoot up to 9 pictures per seconds and Canon EOS R can shoot up to 8 pictures per seconds.

Ability to record movies

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

It is only one of these two cameras that support recording movies and movie clips and that is Canon EOS R. Sadly, the Nikon D3 does not support this.

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.

Nikon D3 weighs 1300 gr (equal to 2,87 lb) which is 97% heavier than Canon EOS R and its 660 gr (or 1,46 lb).