Canon EOS 20D vs Nikon D80

This is a full comparison between the cameras Canon EOS 20D and Nikon D80. We compare them by looking at the categories you see below.

Manufacturing

Canon EOS 20D is manufacturered by Canon but Nikon D80 is from Nikon. Both Canon and Nikon are well known brands though.

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Canon EOS 20D has a "APSC"-sensor while Nikon D80 has a "DX"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

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

Resolution

Canon EOS 20D has a 8,2 MP (Megapixels) resolution while Nikon D80 has 10 MP. If we break down this in more detail this is the data behind the numbers:

Nikon D80 has a 23 % larger resolution than Canon EOS 20D. 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

Both of these cameras offer the exact same ISO range. They both have 100 to 3200.

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 Canon EOS 20D
Lens compatibility chart for Nikon D80

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Canon EOS 20D can shoot up to 5 pictures per seconds and Nikon D80 can shoot up to 3 pictures per seconds.

Ability to record movies

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

Though, neither Canon EOS 20D or Nikon D80 can shoot movies so if that is a functionality that you are really looking for you should look elsewhere.

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 20D weighs 770 gr (equal to 1,7 lb) which is 15% heavier than Nikon D80 and its 668 gr (or 1,47 lb).