Canon EOS 20D Astrophotography vs Nikon D7100

This is a full comparison between the cameras Canon EOS 20D Astrophotography and Nikon D7100. We compare them by looking at the categories you see below.

Manufacturing

Canon EOS 20D Astrophotography is manufacturered by Canon but Nikon D7100 is from Nikon. Both Canon and Nikon are well known brands though.

Canon EOS 20D Astrophotography were released 2005 and Nikon D7100 was released 2013. That is a 8 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Canon EOS 20D Astrophotography 2005
Nikon D7100 2013

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 D7100 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 D7100 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 D7100 has 24,1 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 D7100 24,1 MP
24000000 pixels
6000 x 4000

Nikon D7100 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

Nikon D7100 has a larger ISO-range than Canon EOS 20D Astrophotography. Nikon D7100 has an ISO range that stretches from 100 to 6400 while Canon EOS 20D Astrophotography has 100 to 3200.

Camera ISO Range
Canon EOS 20D Astrophotography 100-3200
Nikon D7100 100-6400

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 D7100

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 D7100 can shoot up to 6 pictures per seconds.

Camera FPS (Frames per second)
Canon EOS 20D Astrophotography 5
Nikon D7100 6

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

It is only one of these two cameras that support recording movies and movie clips and that is Nikon D7100. Sadly, the Canon EOS 20D Astrophotography does not support this.

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 14% heavier than Nikon D7100 and its 675 gr (or 1.49 lb).

Camera Weight
Canon EOS 20D Astrophotography 770 gr
1.7 lb
Nikon D7100 675 gr
1.49 lb

Canon EOS 20D Astrophotography vs Nikon D7100 Specs

Below you will find the complete and detailed technical specs for both Canon EOS 20D Astrophotography and Nikon D7100, 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 D7100
Name Canon EOS 20D Astrophotography Nikon D7100
Manufacturer Canon Nikon
Release Date and Price
Canon EOS 20D Astrophotography
Nikon D7100
Release Year 2005 2013
Release Date 2005-06-01 2013-02-21
MSRP 1499 USD 1199 USD
Buy it today
Camera Type
Canon EOS 20D Astrophotography
Nikon D7100
Camera Type DSLR DSLR
Sensor
Canon EOS 20D Astrophotography
Nikon D7100
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 CMOS
Resolution 3504 x 2336 pixels 6000 x 4000 pixels
Megapixels 8,2 MP 24,1 MP
Image Processor DIGIC 2 EXPEED 3
Image
Canon EOS 20D Astrophotography
Nikon D7100
ISO Range 100 - 3200 100 - 6400
White Balance Presets 6 12
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 D7100
Autofocus Motor Yes Yes
Autofocus Phase Detect
Multi Area
Selective Single Point
Single
Continuous
Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Face Detection
LiveView
Focus Points 9 51
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 D7100
Articulated LCD Fixed Fixed
Screen size 1.8” 3,2”
Screen dots 118000 1228800
Touch screen No No
Screen type N/A Wide Viewing Angle TFT-LCD monitor
Live view No Yes
Viewfinder Type Optical (pentaprism) Optical (pentaprism)
Viewfinder Coverage 95% 100%
Viewfinder Magnification 0.9× (0.56× 35mm equiv.) 0.94×
Viewfinder Resolution N/A N/A
Photography features
Canon EOS 20D Astrophotography
Nikon D7100
Frames per second 5 fps 6 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/8000 seconds 1/8000 seconds
Built-in Flash Yes Yes
Built-in Flash Range 12 meters 12 meters
External Flash Yes Yes
Self-Timer Yes Yes
Time-lapse Yes Yes
Metering modes Multi
Center Weighted
Partial
Multi
Center Weighted
Spot
Average
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 D7100
Video recording No Yes
Video format N/A MPEG4
H.264
Video resolution N/A 1280 x 720
1920 x 1080
Built-in Microphone No Yes
Built-in Speakers No Yes
Storage
Canon EOS 20D Astrophotography
Nikon D7100
Memory Card Compact Flash
SD/SDHC
Connectivity
Canon EOS 20D Astrophotography
Nikon D7100
HDMI Output No Yes
Microphone Port No Yes
Headphone Port No Yes
Wireless No Yes
Wireless WR-1 and WR-R10
Remote Control Yes (N3 connector) Yes (Optional, wired MC-DC2 or wireless WR-1 and WR-R10 )
GPS No Yes
Optional
Body & Dimensions
Canon EOS 20D Astrophotography
Nikon D7100
Enviromentally sealed No Yes
Battery Battery Pack Battery Pack
Battery Details Battery Pack BP-511A
Lithium-Ion EN-EL15 rechargeable battery & charger
Battery Life (CIPA) 1000 shots 950 shots
Width 144 mm 136 mm
Height 106 mm 107 mm
Depth 72 mm 76 mm
Weight 770 gram 675 gram