Nikon D810A vs Canon EOS R3

This is a full comparison between the cameras Nikon D810A and Canon EOS R3. We compare them by looking at the categories you see below.

Nikon D810A

Canon EOS R3

Manufacturing

Nikon D810A is manufacturered by Nikon but Canon EOS R3 is from Canon. Both Nikon and Canon are well known brands though.

Nikon D810A were released 2015 and Canon EOS R3 was released 2021. That is a 6 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Nikon D810A	2015
Canon EOS R3	2021

Type of camera

Nikon D810A is a DSLR camera while Canon EOS R3 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.

Camera	Focal length, 50mm f/1.8 **
Nikon D810A	50 mm Full-frame sensor No crop factor/focal length multiplier
Canon EOS R3	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 (Nikon)
Camera selection can affect the focal length (Canon)

Resolution

Nikon D810A has a 36 MP (Megapixels) resolution while Canon EOS R3 has 24 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Nikon D810A	36 MP 36152320 pixels 7360 x 4912
Canon EOS R3	24 MP 24000000 pixels 6000 x 4000

Nikon D810A has a 51 % larger resolution than Canon EOS R3. 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 R3 has a larger ISO-range than Nikon D810A. Canon EOS R3 has an ISO range that stretches from 100 to 102400 while Nikon D810A has 200 to 12800.

Camera	ISO Range
Nikon D810A	200-12800
Canon EOS R3	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 R3 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 D810A
Lens compatibility chart for Canon EOS R3

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Nikon D810A can shoot up to 5 pictures per seconds and Canon EOS R3 can shoot up to 30 pictures per seconds.

Camera	FPS (Frames per second)
Nikon D810A	5
Canon EOS R3	30

Ability to record movies

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

In this case, both Nikon D810A and Canon EOS R3 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 R3 weighs 1015 gr (equal to 2.24 lb) which is 15% heavier than Nikon D810A and its 880 gr (or 1.94 lb).

Camera	Weight
Nikon D810A	880 gr 1.94 lb
Canon EOS R3	1015 gr 2.24 lb