Nikon D7100 vs Canon EOS 20D Astrophotography

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

Manufacturing

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

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

Camera Released
Nikon D7100 2013
Canon EOS 20D Astrophotography 2005

Type of camera

Both these cameras are DSLR cameras. No difference there.

Sensors / crop factor

These cameras have different sensors. Nikon D7100 has a "Nikon DX"-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 **
Nikon D7100 75 mm
Nikon DX sensor
Crop factor/focal length multiplier by * 1.5
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 (Nikon)
Camera selection can affect the focal length (Canon)

Resolution

Nikon D7100 has a 24,1 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
Nikon D7100 24,1 MP
24000000 pixels
6000 x 4000
Canon EOS 20D Astrophotography 8,2 MP
8185344 pixels
3504 x 2336

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
Nikon D7100 100-6400
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.

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Nikon D7100
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. Nikon D7100 can shoot up to 6 pictures per seconds and Canon EOS 20D Astrophotography can shoot up to 5 pictures per seconds.

Camera FPS (Frames per second)
Nikon D7100 6
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 Nikon D7100. 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 14% heavier than Nikon D7100 and its 675 gr (or 1.49 lb).

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

Nikon D7100 vs Canon EOS 20D Astrophotography Specs

Below you will find the complete and detailed technical specs for both Nikon D7100 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
Nikon D7100
Canon EOS 20D Astrophotography
Name Nikon D7100 Canon EOS 20D Astrophotography
Manufacturer Nikon Canon
Release Date and Price
Nikon D7100
Canon EOS 20D Astrophotography
Release Year 2013 2005
Release Date 2013-02-21 2005-06-01
MSRP 1199 USD 1499 USD
Buy it today
Camera Type
Nikon D7100
Canon EOS 20D Astrophotography
Camera Type DSLR DSLR
Sensor
Nikon D7100
Canon EOS 20D Astrophotography
Sensor Size APS-C (approx 23.7 x 15.5 mm)
Also known as "DX"
APS-C (approx 22.3 x 14.9 mm)
Sensor Type CMOS CMOS
Resolution 6000 x 4000 pixels 3504 x 2336 pixels
Megapixels 24,1 MP 8,2 MP
Image Processor EXPEED 3 DIGIC 2
Image
Nikon D7100
Canon EOS 20D Astrophotography
ISO Range 100 - 6400 100 - 3200
White Balance Presets 12 6
Custom White Balance Yes Yes
Image Stabilization No No
Image Stabilization CIPA Rating 0 stops 0 stops
Uncompressed format RAW RAW
Optics & Focus
Nikon D7100
Canon EOS 20D Astrophotography
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Face Detection
LiveView
Phase Detect
Multi Area
Selective Single Point
Single
Continuous
Focus Points 51 9
Lens Mount Nikon F

See Compatible Lenses
Canon EF
Canon EF-S

See Compatible Lenses
Focal Length Multiplier 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
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
Nikon D7100
Canon EOS 20D Astrophotography
Articulated LCD Fixed Fixed
Screen size 3,2” 1.8”
Screen dots 1228800 118000
Touch screen No No
Screen type Wide Viewing Angle TFT-LCD monitor N/A
Live view Yes No
Viewfinder Type Optical (pentaprism) Optical (pentaprism)
Viewfinder Coverage 100% 95%
Viewfinder Magnification 0.94× 0.9× (0.56× 35mm equiv.)
Viewfinder Resolution N/A N/A
Photography features
Nikon D7100
Canon EOS 20D Astrophotography
Frames per second 6 fps 5 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
Spot
Average
Multi
Center Weighted
Partial
Exposure Compensation +/- 5 (at 1/3 EV, 1/2 EV steps) +/- 2 (at 1/3 EV, 1/2 EV steps)
Videography features
Nikon D7100
Canon EOS 20D Astrophotography
Video recording Yes No
Video format MPEG4
H.264
N/A
Video resolution 1280 x 720
1920 x 1080
N/A
Built-in Microphone Yes No
Built-in Speakers Yes No
Storage
Nikon D7100
Canon EOS 20D Astrophotography
Memory Card SD/SDHC
Compact Flash
Connectivity
Nikon D7100
Canon EOS 20D Astrophotography
HDMI Output Yes No
Microphone Port Yes No
Headphone Port Yes No
Wireless Yes
Wireless WR-1 and WR-R10
No
Remote Control Yes (Optional, wired MC-DC2 or wireless WR-1 and WR-R10 )
Yes (N3 connector)
GPS Yes
Optional
No
Body & Dimensions
Nikon D7100
Canon EOS 20D Astrophotography
Enviromentally sealed Yes No
Battery Battery Pack Battery Pack
Battery Details Lithium-Ion EN-EL15 rechargeable battery & charger
Battery Pack BP-511A
Battery Life (CIPA) 950 shots 1000 shots
Width 136 mm 144 mm
Height 107 mm 106 mm
Depth 76 mm 72 mm
Weight 675 gram 770 gram