Sony a7R III vs Canon EOS 20D Astrophotography
This is a full comparison between the cameras Sony a7R III and Canon EOS 20D Astrophotography. We compare them by looking at the categories you see below.
Manufacturing
Sony a7R III is manufacturered by Sony but Canon EOS 20D Astrophotography is from Canon. Both Sony and Canon are well known brands though.
Sony a7R III were released 2017 and Canon EOS 20D Astrophotography was released 2005. That is a 12 years difference. In tech, this period can be of interest since technology is always improving, etc.| Camera | Released |
| Sony a7R III | 2017 |
| Canon EOS 20D Astrophotography | 2005 |
Type of camera
Sony a7R III is a Mirrorless camera while Canon EOS 20D Astrophotography is a DSLR camera. More information about their differences will come soon.
Sensors / crop factor
These cameras have different sensors. Sony a7R III has a "Sony Full Frame"-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 ** |
| Sony a7R III | 50 mm Full-frame sensor No crop factor/focal length multiplier |
| 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 (Sony)
Camera selection can affect the focal length (Canon)
Resolution
Sony a7R III has a 42 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 |
| Sony a7R III |
42 MP
42177408 pixels 7952 x 5304 |
| Canon EOS 20D Astrophotography |
8,2 MP
8185344 pixels 3504 x 2336 |
Sony a7R III has a 415 % 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
Sony a7R III has a larger ISO-range than Canon EOS 20D Astrophotography. Sony a7R III has an ISO range that stretches from 100 to 32000 while Canon EOS 20D Astrophotography has 100 to 3200.
| Camera | ISO Range |
| Sony a7R III | 100-32000 |
| 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 Sony a7R III
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. Sony a7R III can shoot up to 10 pictures per seconds and Canon EOS 20D Astrophotography can shoot up to 5 pictures per seconds.
| Camera | FPS (Frames per second) |
| Sony a7R III | 10 |
| 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 Sony a7R III. 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 17% heavier than Sony a7R III and its 657 gr (or 1.45 lb).
| Camera | Weight |
| Sony a7R III | 657 gr 1.45 lb |
| Canon EOS 20D Astrophotography | 770 gr 1.7 lb |
Sony a7R III vs Canon EOS 20D Astrophotography Specs
Below you will find the complete and detailed technical specs for both Sony a7R III 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 |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Name | Sony a7R III | Canon EOS 20D Astrophotography |
| Manufacturer | Sony | Canon |
Release Date and Price |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Release Year | 2017 | 2005 |
| Release Date | 2017-10-25 | 2005-06-01 |
| MSRP | 3199 USD | 1499 USD |
| Buy it today |
|
|
Camera Type |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Camera Type | Mirrorless | DSLR |
Sensor |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Sensor Size | Full Frame (approx 36 x 24 mm) | APS-C (approx 22.3 x 14.9 mm) |
| Sensor Type | BSI-CMOS | CMOS |
| Resolution | 7952 x 5304 pixels | 3504 x 2336 pixels |
| Megapixels | 42 MP | 8,2 MP |
| Image Processor | Bionz X | DIGIC 2 |
Image |
Sony a7R III |
Canon EOS 20D Astrophotography |
| ISO Range | 100 - 32000 | 100 - 3200 |
| White Balance Presets | 10 | 6 |
| Custom White Balance | Yes | Yes |
| Image Stabilization |
Yes (Sensor-Shift 5-axis) |
No |
| Image Stabilization CIPA Rating | 5.5 stops | 0 stops |
| Uncompressed format | RAW | RAW |
Optics & Focus |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Autofocus Motor | Yes | Yes |
| Autofocus |
Contract Detect (sensor) Phase Detect Multi Area Center Selective Single Point Tracking Single Continuous Touch Face Detection LiveView |
Phase Detect Multi Area Selective Single Point Single Continuous |
| Focus Points | 399 | 9 |
| Lens Mount |
Sony E See Compatible Lenses |
Canon EF Canon EF-S See Compatible Lenses |
| Focal Length Multiplier |
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 |
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 |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Articulated LCD | Tilting | Fixed |
| Screen size | 3” | 1.8” |
| Screen dots | 1440000 | 118000 |
| Touch screen | Yes | No |
| Screen type | TFT LCD | N/A |
| Live view | Yes | No |
| Viewfinder Type | Electronic | Optical (pentaprism) |
| Viewfinder Coverage | 100% | 95% |
| Viewfinder Magnification | 0.78x | 0.9× (0.56× 35mm equiv.) |
| Viewfinder Resolution | 3686400 | N/A |
Photography features |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Frames per second | 10 fps | 5 fps |
| Minimum Shutter Speed | 30 seconds | 30 seconds |
| Maximum Shutter Speed | 1/8000 seconds | 1/8000 seconds |
| Built-in Flash | No | Yes |
| Built-in Flash Range | N/A | 12 meters |
| External Flash | Yes | Yes |
| Self-Timer | Yes | Yes |
| Time-lapse | No | Yes |
| Metering modes |
Multi Center Weighted Spot |
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 |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Video recording | Yes | No |
| Video format |
MPEG4 H.264 AVCHD |
N/A |
| Video resolution |
1920 x 1080 3840 x 2160 |
N/A |
| Built-in Microphone | Yes | No |
| Built-in Speakers | Yes | No |
Storage |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Memory Card |
SD/SDHC |
Compact Flash |
Connectivity |
Sony a7R III |
Canon EOS 20D Astrophotography |
| HDMI Output | Yes | No |
| Microphone Port | Yes | No |
| Headphone Port | Yes | No |
| Wireless |
Yes Built-in (802.11b/g/n + NFC + Bluetooth) |
No |
| Remote Control | Yes (wired, wireless, smartphone) | Yes (N3 connector) |
| GPS | No | No |
Body & Dimensions |
Sony a7R III |
Canon EOS 20D Astrophotography |
| Enviromentally sealed | Yes | No |
| Battery | Battery Pack | Battery Pack |
| Battery Details |
NP-FZ100 lithium-ion battery and charger
|
Battery Pack BP-511A
|
| Battery Life (CIPA) | 650 shots | 1000 shots |
| Width | 127 mm | 144 mm |
| Height | 96 mm | 106 mm |
| Depth | 74 mm | 72 mm |
| Weight | 657 gram | 770 gram |