Canon EOS M3 vs Canon EOS 20D Astrophotography

This is a full comparison between the cameras Canon EOS M3 and Canon EOS 20D Astrophotography. We compare them by looking at the categories you see below.

Canon EOS M3

Canon EOS 20D Astrophotography

Manufacturing

These cameras are both manufactured by Canon.

Canon EOS M3 were released 2015 and Canon EOS 20D Astrophotography was released 2005. That is a 10 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera	Released
Canon EOS M3	2015
Canon EOS 20D Astrophotography	2005

Type of camera

Canon EOS M3 is a Mirrorless camera while Canon EOS 20D Astrophotography is a DSLR camera. More information about their differences will come soon.

Sensors / crop factor

Both these cameras have the same sorts of sensor (called "Canon APS-C") which means that if you compare these cameras side by side the lenses will also have the same experienced focal length. Neither of the cameras has a Full frame sensor which means that you will get a "crop factor" where the camera's sensor size affect the focal length with a multiplier.

Camera	Focal length, 50mm f/1.8 **
Canon EOS M3	80 mm Canon APS-C sensor Crop factor/focal length multiplier by * 1.6
Canon EOS 20D Astrophotography	80 mm Canon APS-C sensor Crop factor/focal length multiplier by * 1.6

** 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 M3 has a 24 MP (Megapixels) resolution while Canon EOS 20D Astrophotography has 8,2 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Canon EOS M3	24 MP 24000000 pixels 6000 x 4000
Canon EOS 20D Astrophotography	8,2 MP 8185344 pixels 3504 x 2336

Canon EOS M3 has a 193 % 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 M3 has a larger ISO-range than Canon EOS 20D Astrophotography. Canon EOS M3 has an ISO range that stretches from 100 to 12800 while Canon EOS 20D Astrophotography has 100 to 3200.

Camera	ISO Range
Canon EOS M3	100-12800
Canon EOS 20D Astrophotography	100-3200

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.

Worth mentioning is that Canon EOS M3 belongs to the Canon EOS M-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 M

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Canon EOS M3
Lens compatibility chart for Canon EOS 20D Astrophotography

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Canon EOS M3 can shoot up to 4,2 pictures per seconds and Canon EOS 20D Astrophotography can shoot up to 5 pictures per seconds.

Camera	FPS (Frames per second)
Canon EOS M3	4,2
Canon EOS 20D Astrophotography	5

Ability to record movies

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

When comparing these two cameras there is only one of them that can shoot movies and that is Canon EOS M3. Unfortunately Canon EOS 20D Astrophotography does not support recording movies and movie clips.

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 110% heavier than Canon EOS M3 and its 366 gr (or 0.81 lb).

Camera	Weight
Canon EOS M3	366 gr 0.81 lb
Canon EOS 20D Astrophotography	770 gr 1.7 lb