Canon EOS 20D Astrophotography vs Nikon D3s

This is a full comparison between the cameras Canon EOS 20D Astrophotography and Nikon D3s. We compare them by looking at the categories you see below.

Canon EOS 20D Astrophotography

Nikon D3s

Manufacturing

Canon EOS 20D Astrophotography is manufacturered by Canon but Nikon D3s is from Nikon. Both Canon and Nikon are well known brands though.

Canon EOS 20D Astrophotography were released 2005 and Nikon D3s was released 2009. That is a 4 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Canon EOS 20D Astrophotography	2005
Nikon D3s	2009

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 "Canon APS-C"-sensor while Nikon D3s has a "Nikon FX"-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 **
Canon EOS 20D Astrophotography	80 mm Canon APS-C sensor Crop factor/focal length multiplier by * 1.6
Nikon D3s	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 (Canon)
Camera selection can affect the focal length (Nikon)

Resolution

Canon EOS 20D Astrophotography has a 8,2 MP (Megapixels) resolution while Nikon D3s has 12,1 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Canon EOS 20D Astrophotography	8,2 MP 8185344 pixels 3504 x 2336
Nikon D3s	12,1 MP 12052992 pixels 4256 x 2832

Nikon D3s 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, afterward while editing the pictures, if needed that is.

ISO range

Nikon D3s has a larger ISO-range than Canon EOS 20D Astrophotography. Nikon D3s has an ISO range that stretches from 200 to 102400 while Canon EOS 20D Astrophotography has 100 to 3200.

Camera	ISO Range
Canon EOS 20D Astrophotography	100-3200
Nikon D3s	200-102400

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 Canon EOS 20D Astrophotography
Lens compatibility chart for Nikon D3s

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Canon EOS 20D Astrophotography can shoot up to 5 pictures per seconds and Nikon D3s can shoot up to 11 pictures per seconds.

Camera	FPS (Frames per second)
Canon EOS 20D Astrophotography	5
Nikon D3s	11

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 Nikon D3s. Sadly, the Canon EOS 20D Astrophotography 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 D3s weighs 1240 gr (equal to 2.73 lb) which is 61% heavier than Canon EOS 20D Astrophotography and its 770 gr (or 1.7 lb).

Camera	Weight
Canon EOS 20D Astrophotography	770 gr 1.7 lb
Nikon D3s	1240 gr 2.73 lb