Sony Alpha a7R III vs Sony Alpha a9
Compare key differences and full specifications to find the camera that suits your photography.
Key differences
- Weight: Sony Alpha a7R III: 657 g ; Sony Alpha a9: 673 g
- Sensor size: Sony Alpha a7R III: 35.9 x 24 mm ; Sony Alpha a9: 35.6 x 23.8 mm
- Sensor resolution: Sony Alpha a7R III: 7976 x 5317 ; Sony Alpha a9: 6026 x 4017
- Effective megapixels: Sony Alpha a7R III: 42.4 ; Sony Alpha a9: 24.2
Best for
Larger prints and more cropping detail: Sony Alpha a7R III (42.4).
| Specification | Sony Alpha a7R III | Sony Alpha a9 |
|---|---|---|
| General | ||
| Brand | Sony | Sony |
| Model | Alpha a7R III | Alpha a9 |
| Year | 2017 | 2017 |
| Body | ||
| Dimensions | 126.9 x 95.6 x 73.7 mm | 126.9 x 95.6 x 63 mm |
| Weight | 657 g | 673 g |
| Sensor | ||
| Sensor type | CMOS | CMOS |
| Sensor size | 35.9 x 24 mm | 35.6 x 23.8 mm |
| Sensor resolution | 7976 x 5317 | 6026 x 4017 |
| Crop factor | 1.0 | 1.01 |
| Total megapixels | 43.6 | 28.3 |
| Effective megapixels | 42.4 | 24.2 |
| Image | ||
| Max. image resolution | 7952 x 5304 | 6000 x 4000 |
| ISO | Auto, 100-32000 (expandable to 50-102400) | Auto, 100-51200 (expandable to 50-204800) |
| Exposure & Shutter | ||
| Min. shutter speed | 30 sec | 30 sec |
| Max. shutter speed | 1/8000 sec | 1/8000 sec |
| Metering | Multi, Center-weighted, Spot | Multi, Center-weighted, Highlight-weighted, Spot, Average |
| Exposure compensation | ±5 EV (in 1/3 EV, 1/2 EV, 1 EV steps) | ±5 EV (in 1/3 EV, 1/2 EV steps) |
| Aperture priority | Yes | Yes |
| Shutter priority | Yes | Yes |
| White balance presets | 10.0 | 10.0 |
| Video | ||
| Max. video mode | 3840x2160 (30p/25p/24p) | 3840x2160 (30p/25p/24p) |
| Display & Viewfinder | ||
| Screen size | 3" | 3" |
| Screen resolution | 1,440,000 dots | 1,440,000 dots |
| Viewfinder | Electronic | Electronic |
| Storage & Connectivity | ||
| Storage types | SD/SDHC/SDXC/MS PRO Duo | SD/SDHC/SDXC/MS PRO Duo |
| USB | USB 3.0 (5 GBit/sec) | USB 2.0 (480 Mbit/sec) |
| Power | ||
| Battery | NP-FZ100 lithium-ion battery | NP-FZ100 lithium-ion battery |
| Lens & Focus | ||
| Digital zoom | Yes | Yes |