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.

Canon EOS 20D Astrophotography were released 2005 and Nikon D100 was released 2002. That is a 3 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Canon EOS 20D Astrophotography 2005
Nikon D100 2002

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.

Camera Focal length, 50mm f/1.8 **
Canon EOS 20D Astrophotography 80 mm
Canon APS-C sensor
Crop factor/focal length multiplier by * 1.6
Nikon D100 75 mm
Nikon DX sensor
Crop factor/focal length multiplier by * 1.5

** 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:

Camera Megapixels
Canon EOS 20D Astrophotography 8,2 MP
8185344 pixels
3504 x 2336
Nikon D100 6 MP
6016000 pixels
3008 x 2000

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.

Camera ISO Range
Canon EOS 20D Astrophotography 100-3200
Nikon D100 200-1600

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.

Camera FPS (Frames per second)
Canon EOS 20D Astrophotography 5
Nikon D100 3

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).

Camera Weight
Canon EOS 20D Astrophotography 770 gr
1.7 lb
Nikon D100 780 gr
1.72 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
Buy it today
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