Canon EOS 20D Astrophotography vs Canon EOS R6

This is a full comparison between the cameras Canon EOS 20D Astrophotography and Canon EOS R6. We compare them by looking at the categories you see below.

Canon EOS 20D Astrophotography

Canon EOS R6

Manufacturing

These cameras are both manufactured by Canon.

Canon EOS 20D Astrophotography were released 2005 and Canon EOS R6 was released 2020. That is a 15 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Canon EOS 20D Astrophotography	2005
Canon EOS R6	2020

Type of camera

Canon EOS 20D Astrophotography is a DSLR camera while Canon EOS R6 is a Mirrorless camera. More information about their differences will come soon.

Sensors / crop factor

These cameras have different sensors. Canon EOS 20D Astrophotography has a "Canon APS-C"-sensor while Canon EOS R6 has a "Canon Full Frame"-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
Canon EOS R6	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)

Resolution

Canon EOS 20D Astrophotography has a 8,2 MP (Megapixels) resolution while Canon EOS R6 has 20 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
Canon EOS R6	20 MP 19961856 pixels 5472 x 3648

Canon EOS R6 has a 144 % 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

Canon EOS R6 has a larger ISO-range than Canon EOS 20D Astrophotography. Canon EOS R6 has an ISO range that stretches from 100 to 102400 while Canon EOS 20D Astrophotography has 100 to 3200.

Camera	ISO Range
Canon EOS 20D Astrophotography	100-3200
Canon EOS R6	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 R6 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 Canon EOS 20D Astrophotography
Lens compatibility chart for Canon EOS R6

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 Canon EOS R6 can shoot up to 20 pictures per seconds.

Camera	FPS (Frames per second)
Canon EOS 20D Astrophotography	5
Canon EOS R6	20

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 R6. 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.

Canon EOS 20D Astrophotography weighs 770 gr (equal to 1.7 lb) which is 13% heavier than Canon EOS R6 and its 680 gr (or 1.5 lb).

Camera	Weight
Canon EOS 20D Astrophotography	770 gr 1.7 lb
Canon EOS R6	680 gr 1.5 lb