Canon EOS R6 vs Canon EOS 20D Astrophotography

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

Manufacturing

These cameras are both manufactured by Canon.

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

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

Type of camera

Canon EOS R6 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 R6 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.

Camera Focal length, 50mm f/1.8 **
Canon EOS R6 50 mm
Full-frame sensor
No crop factor/focal length multiplier
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 R6 has a 20 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 R6 20 MP
19961856 pixels
5472 x 3648
Canon EOS 20D Astrophotography 8,2 MP
8185344 pixels
3504 x 2336

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 R6 100-102400
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 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 R6
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 R6 can shoot up to 20 pictures per seconds and Canon EOS 20D Astrophotography can shoot up to 5 pictures per seconds.

Camera FPS (Frames per second)
Canon EOS R6 20
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 R6. 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 13% heavier than Canon EOS R6 and its 680 gr (or 1.5 lb).

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

Canon EOS R6 vs Canon EOS 20D Astrophotography Specs

Below you will find the complete and detailed technical specs for both Canon EOS R6 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 R6
Canon EOS 20D Astrophotography
Name Canon EOS R6 Canon EOS 20D Astrophotography
Manufacturer Canon Canon
Release Date and Price
Canon EOS R6
Canon EOS 20D Astrophotography
Release Year 2020 2005
Release Date 2020-07-09 2005-06-01
MSRP 2499 USD 1499 USD
Buy it today
Camera Type
Canon EOS R6
Canon EOS 20D Astrophotography
Camera Type Mirrorless DSLR
Sensor
Canon EOS R6
Canon EOS 20D Astrophotography
Sensor Size Full Frame (approx 36 x 24 mm) APS-C (approx 22.3 x 14.9 mm)
Sensor Type CMOS CMOS
Resolution 5472 x 3648 pixels 3504 x 2336 pixels
Megapixels 20 MP 8,2 MP
Image Processor DIGIC X DIGIC 2
Image
Canon EOS R6
Canon EOS 20D Astrophotography
ISO Range 100 - 102400 100 - 3200
White Balance Presets 8 6
Custom White Balance Yes Yes
Image Stabilization Yes
(Sensor-Shift. Works with lens-based IS systems for maximum shake reduction.)
No
Image Stabilization CIPA Rating 0 stops 0 stops
Uncompressed format RAW RAW
Optics & Focus
Canon EOS R6
Canon EOS 20D Astrophotography
Autofocus Motor Yes Yes
Autofocus 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 R6
Canon EOS 20D Astrophotography
Articulated LCD Fully articulated Fixed
Screen size 3” 1.8”
Screen dots 1620000 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 3690000 N/A
Photography features
Canon EOS R6
Canon EOS 20D Astrophotography
Frames per second 20 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 No 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 R6
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
N/A
Built-in Microphone Yes No
Built-in Speakers Yes No
Storage
Canon EOS R6
Canon EOS 20D Astrophotography
Memory Card SD/SDHC
Compact Flash
Connectivity
Canon EOS R6
Canon EOS 20D Astrophotography
HDMI Output Yes No
Microphone Port Yes No
Headphone Port Yes No
Wireless Yes
Built-in ( 802.11b/g/n + Bluetooth)
No
Remote Control Yes Yes (N3 connector)
GPS No No
Body & Dimensions
Canon EOS R6
Canon EOS 20D Astrophotography
Enviromentally sealed Yes No
Battery Battery Pack Battery Pack
Battery Details LP-E6NH lithium-ion battery & charger
Battery Pack BP-511A
Battery Life (CIPA) 360 shots 1000 shots
Width 138 mm 144 mm
Height 98 mm 106 mm
Depth 88 mm 72 mm
Weight 680 gram 770 gram