Canon EOS 20D Astrophotography vs Nikon D100

This is a full comparison between the cameras Canon EOS 20D Astrophotography and Nikon D100. We compare them by looking at the categories you see below.

Manufacturing

Canon EOS 20D Astrophotography is manufacturered by Canon but Nikon D100 is from Nikon. Both Canon and Nikon are well known brands though.

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 Nikon D100 has a "Nikon DX"-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)
Camera selection can affect the focal length (Nikon)

Resolution

Canon EOS 20D Astrophotography has a 8,2 MP (Megapixels) resolution while Nikon D100 has 6 MP. If we break down this in more detail this is the data behind the numbers:

Canon EOS 20D Astrophotography has a 36 % larger resolution than Nikon D100. 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 20D Astrophotography has a larger ISO-range than Nikon D100. Canon EOS 20D Astrophotography has an ISO range that stretches from 100 to 3200 while Nikon D100 has 200 to 1600.

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 Nikon D100

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 Nikon D100 can shoot up to 3 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 Nikon D100 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.

Nikon D100 weighs 780 gr (equal to 1.72 lb) which is 1% heavier than Canon EOS 20D Astrophotography and its 770 gr (or 1.7 lb).

Canon EOS 20D Astrophotography vs Nikon D100 Specs

Below you will find the complete and detailed technical specs for both Canon EOS 20D Astrophotography and Nikon D100, 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	Nikon D100
Name	Canon EOS 20D Astrophotography	Nikon D100
Manufacturer	Canon	Nikon
Release Date and Price	Canon EOS 20D Astrophotography	Nikon D100
Release Year	2005	2002
Release Date	2005-06-01	2002-02-21
MSRP	1499 USD	1999 USD
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Camera Type	Canon EOS 20D Astrophotography	Nikon D100
Camera Type	DSLR	DSLR
Sensor	Canon EOS 20D Astrophotography	Nikon D100
Sensor Size	APS-C (approx 22.3 x 14.9 mm)	APS-C (approx 23.7 x 15.5 mm) Also known as "DX"
Sensor Type	CMOS	CCD
Resolution	3504 x 2336 pixels	3008 x 2000 pixels
Megapixels	8,2 MP	6 MP
Image Processor	DIGIC 2	EXPEED
Image	Canon EOS 20D Astrophotography	Nikon D100
ISO Range	100 - 3200	200 - 1600
White Balance Presets	6	6
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	Nikon D100
Autofocus Motor	Yes	Yes
Autofocus	Phase Detect Multi Area Selective Single Point Single Continuous	Contract Detect (sensor) Phase Detect Multi Area Selective Single Point Single Continuous
Focus Points	9	5
Lens Mount	Canon EF Canon EF-S See Compatible Lenses	Nikon F 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	DX / APS-C (1.5x) 1.5x multiplier Example: 24 mm becomes 36 mm 50 mm becomes 75 mm 100 mm becomes 150 mm 200 mm becomes 300 mm
Screen & Viewfinder	Canon EOS 20D Astrophotography	Nikon D100
Articulated LCD	Fixed	Fixed
Screen size	1.8”	1,8”
Screen dots	118000	118000
Touch screen	No	No
Screen type	N/A	N/A
Live view	No	No
Viewfinder Type	Optical (pentaprism)	Optical (pentaprism)
Viewfinder Coverage	95%	95%
Viewfinder Magnification	0.9× (0.56× 35mm equiv.)	0.8× (0.53× 35mm equiv.)
Viewfinder Resolution	N/A	N/A
Photography features	Canon EOS 20D Astrophotography	Nikon D100
Frames per second	5 fps	3 fps
Minimum Shutter Speed	30 seconds	30 seconds
Maximum Shutter Speed	1/8000 seconds	1/4000 seconds
Built-in Flash	Yes	Yes
Built-in Flash Range	12 meters	11 meters
External Flash	Yes	Yes
Self-Timer	Yes	Yes
Time-lapse	Yes	No
Metering modes	Multi Center Weighted Partial	Multi Center Weighted Spot
Exposure Compensation	+/- 2 (at 1/3 EV, 1/2 EV steps)	+/- 5 (at 1/3 EV, 1/2 EV steps)
Videography features	Canon EOS 20D Astrophotography	Nikon D100
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	Nikon D100
Memory Card	Compact Flash	Compact Flash
Connectivity	Canon EOS 20D Astrophotography	Nikon D100
HDMI Output	No	Yes
Microphone Port	No	No
Headphone Port	No	No
Wireless	No	No
Remote Control	Yes (N3 connector)	Yes (Via Optional vertical grip or software)
GPS	No	No
Body & Dimensions	Canon EOS 20D Astrophotography	Nikon D100
Enviromentally sealed	No	No
Battery	Battery Pack	Battery Pack
Battery Details	Battery Pack BP-511A	Nikon EN-EL3 lithium-ion battery
Battery Life (CIPA)	1000 shots	N/A
Width	144 mm	144 mm
Height	106 mm	116 mm
Depth	72 mm	81 mm
Weight	770 gram	780 gram