Canon EOS 20D Astrophotography vs Nikon D3

This is a full comparison between the cameras Canon EOS 20D Astrophotography and Nikon D3. We compare them by looking at the categories you see below.

Canon EOS 20D Astrophotography
Nikon D3

Manufacturing

Canon EOS 20D Astrophotography is manufacturered by Canon but Nikon D3 is from Nikon. Both Canon and Nikon are well known brands though.

Canon EOS 20D Astrophotography were released 2005 and Nikon D3 was released 2007. That is a 2 years difference. In tech, this period of time can be of interest since technology is always improving etc.

Camera Manufacturer Released
Canon EOS 20D Astrophotography Canon 2005
Nikon D3 Nikon 2007

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Canon EOS 20D Astrophotography has a "APSC"-sensor while Nikon D3 has a "FX"-sensor, and their difference in sensors will also effect the crop factor and experience focal length. See the table below.

Camera Experienced focal length when using a lens with 50mm focal length (ex a common "50mm f/1.8")
Canon EOS 20D Astrophotography 80 mm (a Canon APS-C sensor have a crop factor / focal length multiplier by * 1.6)
Nikon D3 50 mm (a fullframe sensor does not have a crop factor / focal length multiplier)

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 Astrophotography has a 8,2 MP (Megapixels) resolution while Nikon D3 has 12,1 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels Pixel (total) Pixels (width) Pixels (height)
Canon EOS 20D Astrophotography 8,2 MP 8185344 3504 2336
Nikon D3 12,1 MP 12052992 4256 2832

Nikon D3 has a 47 % larger resolution than Canon EOS 20D Astrophotography. This could give you more details in the picture but also a possibility to crop more in the pictures, afterwards while editing the pictures, if needed that is.

ISO range

Nikon D3 has a larger ISO-range than Canon EOS 20D Astrophotography. Nikon D3 has an ISO range that stretches from 200 to 25600 while Canon EOS 20D Astrophotography has 100 to 3200.

Camera ISO Range
Canon EOS 20D Astrophotography 100-3200
Nikon D3 200-25600

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that supports autofocus, does not have a autofocus motor of their own but this wont cause any problems with these two cameras.

Here is a complete overview of which lenses that work with each camera:
Lens compatibility chart for Canon EOS 20D Astrophotography
Lens compatibility chart for Nikon D3

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definately be of interest. Canon EOS 20D Astrophotography can shoot up to 5 pictures per seconds and Nikon D3 can shoot up to 9 pictures per seconds.

Camera FPS (Frames per second)
Canon EOS 20D Astrophotography 5
Nikon D3 9

Ability to record movies

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

Though, neither Canon EOS 20D Astrophotography or Nikon D3 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, carried around, for several hours at the time.

Nikon D3 weighs 1300 gr (equal to 2,87 lb) which is 69% heavier than Canon EOS 20D Astrophotography and its 770 gr (or 1,7 lb).

Camera Weight (in gram) Weight (in pounds)
Canon EOS 20D Astrophotography 770 gr 1,7 lb
Nikon D3 1300 gr 2,87 lb