Canon EOS R3 vs Canon EOS 20D Astrophotography

This is a full comparison between the cameras Canon EOS R3 and Canon EOS 20D Astrophotography. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Canon.

Type of camera

Canon EOS R3 is a Mirrorless camera while Canon EOS 20D Astrophotography is a DSLR camera. More information about their differences will come soon.

Sensors / crop factor

These cameras have different sensors. Canon EOS R3 has a "Canon Full Frame"-sensor while Canon EOS 20D Astrophotography has a "Canon APS-C"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

** 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 R3 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:

Canon EOS R3 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 R3 has a larger ISO-range than Canon EOS 20D Astrophotography. Canon EOS R3 has an ISO range that stretches from 100 to 102400 while Canon EOS 20D Astrophotography has 100 to 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 R3 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 R3
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 R3 can shoot up to 30 pictures per seconds and Canon EOS 20D Astrophotography can shoot up to 5 pictures per seconds.

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 R3. 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 R3 weighs 1015 gr (equal to 2.24 lb) which is 32% heavier than Canon EOS 20D Astrophotography and its 770 gr (or 1.7 lb).

Canon EOS R3 vs Canon EOS 20D Astrophotography Specs

Below you will find the complete and detailed technical specs for both Canon EOS R3 and Canon EOS 20D Astrophotography, next to each other. Each category of data is a link to an article covering the subject, giving you a deeper understanding so you can better understand the strengths and weaknesses of the two camera models.

Product	Canon EOS R3	Canon EOS 20D Astrophotography
Name	Canon EOS R3	Canon EOS 20D Astrophotography
Manufacturer	Canon	Canon
Release Date and Price	Canon EOS R3	Canon EOS 20D Astrophotography
Release Year	2021	2005
Release Date	2021-04-14	2005-06-01
MSRP	5999 USD	1499 USD
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Camera Type	Canon EOS R3	Canon EOS 20D Astrophotography
Camera Type	Mirrorless	DSLR
Sensor	Canon EOS R3	Canon EOS 20D Astrophotography
Sensor Size	Full Frame (approx 36 x 24 mm)	APS-C (approx 22.3 x 14.9 mm)
Sensor Type	Stacked CMOS	CMOS
Resolution	6000 x 4000 pixels	3504 x 2336 pixels
Megapixels	24 MP	8,2 MP
Image Processor	DIGIC X	DIGIC 2
Image	Canon EOS R3	Canon EOS 20D Astrophotography
ISO Range	100 - 102400	100 - 3200
White Balance Presets	6	6
Custom White Balance	No	Yes
Image Stabilization	Yes (Sensor-Shift)	No
Image Stabilization CIPA Rating	0 stops	0 stops
Uncompressed format	RAW	RAW
Optics & Focus	Canon EOS R3	Canon EOS 20D Astrophotography
Autofocus Motor	Yes	Yes
Autofocus	Contract Detect (sensor) Phase Detect Multi Area Center Selective Single Point Tracking Single Continuous Touch Face Detection LiveView	Phase Detect Multi Area Selective Single Point Single Continuous
Focus Points	1053	9
Lens Mount	Canon RF See Compatible Lenses	Canon EF Canon EF-S See Compatible Lenses
Focal Length Multiplier	Full frame No multiplier Example: 24 mm remains 24 mm 50 mm remains 50 mm 100 mm remains 100 mm 200 mm remains 200 mm	APS-C Sensor 1.6x multiplier Example: 24 mm becomes 38 mm 50 mm becomes 80 mm 100 mm becomes 160 mm 200 mm becomes 320 mm
Screen & Viewfinder	Canon EOS R3	Canon EOS 20D Astrophotography
Articulated LCD	Fully articulated	Fixed
Screen size	3.2”	1.8”
Screen dots	4150000	118000
Touch screen	Yes	No
Screen type	TFT LCD	N/A
Live view	Yes	No
Viewfinder Type	Electronic	Optical (pentaprism)
Viewfinder Coverage	100%	95%
Viewfinder Magnification	0.76×	0.9× (0.56× 35mm equiv.)
Viewfinder Resolution	5760000	N/A
Photography features	Canon EOS R3	Canon EOS 20D Astrophotography
Frames per second	30 fps	5 fps
Minimum Shutter Speed	30 seconds	30 seconds
Maximum Shutter Speed	1/8000 seconds	1/8000 seconds
Built-in Flash	No	Yes
Built-in Flash Range	N/A	12 meters
External Flash	Yes	Yes
Self-Timer	Yes	Yes
Time-lapse	Yes	Yes
Metering modes	Multi Center Weighted Spot Partial	Multi Center Weighted Partial
Exposure Compensation	+/- 3 (at 1/3 EV, 1/2 EV steps)	+/- 2 (at 1/3 EV, 1/2 EV steps)
Videography features	Canon EOS R3	Canon EOS 20D Astrophotography
Video recording	Yes	No
Video format	MPEG4 H.264 H.265	N/A
Video resolution	1920 x 1080 3840 x 2160 4096 x 2160	N/A
Built-in Microphone	Yes	No
Built-in Speakers	Yes	No
Storage	Canon EOS R3	Canon EOS 20D Astrophotography
Memory Card	Compact Flash Express SD/SDHC	Compact Flash
Connectivity	Canon EOS R3	Canon EOS 20D Astrophotography
HDMI Output	Yes	No
Microphone Port	Yes	No
Headphone Port	Yes	No
Wireless	Yes Built-in (802.11ac + Bluetooth)	No
Remote Control	Yes (via smartphone)	Yes (N3 connector)
GPS	Yes Built-in	No
Body & Dimensions	Canon EOS R3	Canon EOS 20D Astrophotography
Enviromentally sealed	Yes	No
Battery	Built-in	Battery Pack
Battery Details	LP-E19 lithium-ion battery & charger	Battery Pack BP-511A
Battery Life (CIPA)	760 shots	1000 shots
Width	150 mm	144 mm
Height	143 mm	106 mm
Depth	87 mm	72 mm
Weight	1015 gram	770 gram