Canon EOS 20D Astrophotography vs Canon EOS Rebel SL1

This is a full comparison between the cameras Canon EOS 20D Astrophotography and Canon EOS Rebel SL1. We compare them by looking at the categories you see below.

Canon EOS 20D Astrophotography
Canon EOS Rebel SL1

Manufacturing

These cameras are both manufacturered by Canon.

Canon EOS 20D Astrophotography were released 2005 and Canon EOS Rebel SL1 was released 2013. That is a 8 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
Canon EOS Rebel SL1 Canon 2013

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

Both these cameras have the same sorts sensor (called "APSC") which means that if you compare the cameras side by side the lenses will also have the same experienced focal length. Neither of the cameras have a Full frame sensor which means that you will get a "crop factor" where the cameras sensor size effect the focal length with a multiplier.

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)
Canon EOS Rebel SL1 80 mm (a Canon APS-C sensor have a crop factor / focal length multiplier by * 1.6)

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 Rebel SL1 has 18 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
Canon EOS Rebel SL1 18 MP 17915904 5184 3456

Canon EOS Rebel SL1 has a 119 % 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

Canon EOS Rebel SL1 has a larger ISO-range than Canon EOS 20D Astrophotography. Canon EOS Rebel SL1 has an ISO range that stretches from 100 to 12800 while Canon EOS 20D Astrophotography has 100 to 3200.

Camera ISO Range
Canon EOS 20D Astrophotography 100-3200
Canon EOS Rebel SL1 100-12800

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 Canon EOS Rebel SL1

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 Canon EOS Rebel SL1 can shoot up to 4 pictures per seconds.

Camera FPS (Frames per second)
Canon EOS 20D Astrophotography 5
Canon EOS Rebel SL1 4

Ability to record movies

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

Though, neither Canon EOS 20D Astrophotography or Canon EOS Rebel SL1 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.

Canon EOS 20D Astrophotography weighs 770 gr (equal to 1,7 lb) which is 89% heavier than Canon EOS Rebel SL1 and its 407 gr (or 0,9 lb).

Camera Weight (in gram) Weight (in pounds)
Canon EOS 20D Astrophotography 770 gr 1,7 lb
Canon EOS Rebel SL1 407 gr 0,9 lb