Canon EOS 20D Astrophotography vs Canon EOS 1Ds Mark III

This is a full comparison between the cameras Canon EOS 20D Astrophotography and Canon EOS 1Ds Mark III. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Canon.

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Canon EOS 20D Astrophotography has a "Canon APS-C"-sensor while Canon EOS 1Ds Mark III 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.

** 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 1Ds Mark III has 21,1 MP. If we break down this in more detail this is the data behind the numbers:

Canon EOS 1Ds Mark III has a 157 % 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 1Ds Mark III has a larger ISO-range than Canon EOS 20D Astrophotography. Canon EOS 1Ds Mark III has an ISO range that stretches from 50 to 3200 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.

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 1Ds Mark III

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 1Ds Mark III 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.

Though, neither Canon EOS 20D Astrophotography or Canon EOS 1Ds Mark III 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, or carried around, for several hours at a time.

Canon EOS 1Ds Mark III weighs 1385 gr (equal to 3.05 lb) which is 80% heavier than Canon EOS 20D Astrophotography and its 770 gr (or 1.7 lb).

Canon EOS 20D Astrophotography vs Canon EOS 1Ds Mark III Specs

Below you will find the complete and detailed technical specs for both Canon EOS 20D Astrophotography and Canon EOS 1Ds Mark III, 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 20D Astrophotography	Canon EOS 1Ds Mark III
Name	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Manufacturer	Canon	Canon
Release Date and Price	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Release Year	2005	2007
Release Date	2005-06-01	2007-08-20
MSRP	1499 USD	6999 USD
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Camera Type	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Camera Type	DSLR	DSLR
Sensor	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Sensor Size	APS-C (approx 22.3 x 14.9 mm)	Full Frame (approx 36 x 24 mm)
Sensor Type	CMOS	CMOS
Resolution	3504 x 2336 pixels	5616 x 3744 pixels
Megapixels	8,2 MP	21,1 MP
Image Processor	DIGIC 2	DUAL DIGIC 3
Image	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
ISO Range	100 - 3200	50 - 3200
White Balance Presets	6	8
Custom White Balance	Yes	Yes
Image Stabilization	No	No
Image Stabilization CIPA Rating	0 stops	0 stops
Uncompressed format	RAW	RAW
Optics & Focus	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Autofocus Motor	Yes	Yes
Autofocus	Phase Detect Multi Area Selective Single Point Single Continuous	Phase Detect Multi Area Selective Single Point Single Continuous
Focus Points	9	45
Lens Mount	Canon EF Canon EF-S See Compatible Lenses	Canon EF See Compatible Lenses
Focal Length Multiplier	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	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
Screen & Viewfinder	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Articulated LCD	Fixed	Fixed
Screen size	1.8”	3”
Screen dots	118000	230000
Touch screen	No	No
Screen type	N/A	N/A
Live view	No	Yes
Viewfinder Type	Optical (pentaprism)	Optical (pentaprism)
Viewfinder Coverage	95%	100%
Viewfinder Magnification	0.9× (0.56× 35mm equiv.)	0.76×
Viewfinder Resolution	N/A	N/A
Photography features	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Frames per second	5 fps	5 fps
Minimum Shutter Speed	30 seconds	30 seconds
Maximum Shutter Speed	1/8000 seconds	1/8000 seconds
Built-in Flash	Yes	No
Built-in Flash Range	12 meters	N/A
External Flash	Yes	Yes
Self-Timer	Yes	Yes
Time-lapse	Yes	Yes
Metering modes	Multi Center Weighted Partial	Multi Center Weighted Spot Partial
Exposure Compensation	+/- 2 (at 1/3 EV, 1/2 EV steps)	+/- 3 (at 1/3 EV, 1/2 EV steps)
Videography features	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Video recording	No	No
Video format	N/A	N/A
Video resolution	N/A	N/A
Built-in Microphone	No	No
Built-in Speakers	No	No
Storage	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Memory Card	Compact Flash	Compact Flash SD/SDHC
Connectivity	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
HDMI Output	No	No
Microphone Port	No	No
Headphone Port	No	No
Wireless	No	Yes Optional with WFT-E2 II
Remote Control	Yes (N3 connector)	Yes (N3 connector)
GPS	No	No
Body & Dimensions	Canon EOS 20D Astrophotography	Canon EOS 1Ds Mark III
Enviromentally sealed	No	Yes
Battery	Battery Pack	Battery Pack
Battery Details	Battery Pack BP-511A	Canon LP-E4N Battery Pack
Battery Life (CIPA)	1000 shots	1800 shots
Width	144 mm	150 mm
Height	106 mm	160 mm
Depth	72 mm	80 mm
Weight	770 gram	1385 gram