Sony a7R III vs Sony a7S III
The bottom line
These are closely matched on paper, so it comes down to emphasis. The Sony a7S III leans further into video, while the Sony a7R III is the stronger stills tool. Match the body to whichever you do more of — the differences below show exactly where each pulls ahead.
Choose the Sony a7R III if…
- ✓You want maximum detail for landscapes, studio or large prints — 42.4MP resolves noticeably more than 12.1MP and gives more cropping latitude.
Choose the Sony a7S III if…
- ✓You shoot video seriously — it brings smoother 120p 4K vs 30p and no per-clip recording limit (vs a 29-min cap).
- ✓You vlog or shoot handheld solo — the fully-articulating screen flips to face you and there's a mic input for clean audio.
- ✓You shoot in low light or indoors — a higher native ISO ceiling (102,400) and AF that focuses down to -6 EV give it the edge after dark.
Where they differ
- ›Resolution: 42.4MP on the Sony a7R III vs 12.1MP — more detail and crop room, at the cost of larger files.
- ›Video: the Sony a7S III is the stronger video tool — 4K up to 120p, 10-bit internal and Log.
- ›Price: the Sony a7R III launched at $3,199, $300 under the Sony a7S III — money that could go toward glass.
Frequently asked
Is the Sony a7R III or the Sony a7S III better?
These are closely matched on paper, so it comes down to emphasis. The Sony a7S III leans further into video, while the Sony a7R III is the stronger stills tool. Match the body to whichever you do more of — the differences below show exactly where each pulls ahead.
Who should choose the Sony a7R III?
Choose the Sony a7R III if you want maximum detail for landscapes, studio or large prints — 42.4MP resolves noticeably more than 12.1MP and gives more cropping latitude.
Who should choose the Sony a7S III?
Choose the Sony a7S III if you shoot video seriously — it brings smoother 120p 4K vs 30p and no per-clip recording limit (vs a 29-min cap). Choose it if you vlog or shoot handheld solo — the fully-articulating screen flips to face you and there's a mic input for clean audio. Choose it if you shoot in low light or indoors — a higher native ISO ceiling (102,400) and AF that focuses down to -6 EV give it the edge after dark.
What is the main difference between the Sony a7R III and the Sony a7S III?
Resolution: 42.4MP on the Sony a7R III vs 12.1MP — more detail and crop room, at the cost of larger files.
| Product | ||
|---|---|---|
| Imaging | ||
| Sensor Type | BSI CMOS | BSI CMOS |
| Sensor Size | Full-Frame | Full-Frame |
| Image Processor | BIONZ X | BIONZ XR |
| Effective Resolution | 42.4 MP | 12.1 MP |
| Lens Mount | Sony E | Sony E |
| Exposure Control | ||
| ISO Range (Native) | 100 – 32000 | 80 – 102400 |
| ISO Range (Extended) | 50 – 102400 | 40 – 409600 |
| Mechanical Shutter | 1/8000 | 1/8000 |
| Electronic Shutter | 1/8000 | 1/8000 |
| Flash Sync Speed | 1/250 | 1/250 |
| Built-in Flash | No | No |
| Still Image Capture | ||
| Continuous Shooting | 10 fps | 10 fps |
| Video Capture | ||
| Max Resolution | 4K | 4K |
| 8K Recording | − | − |
| 4K Recording | Up to 30p | Up to 120p |
| 1080p Recording | Up to 120p | Up to 240p |
| 10-bit Internal | Yes | Yes |
| Recording Limit | 29 min | No limit |
| Log Profiles | S-Log3 / HLG | S-Log3 / HLG / S-Cinetone |
| Built-in Mic | Stereo | Stereo |
| Headphone Jack | Yes | Yes |
| Mic Input | Yes | Yes |
| HDMI Output | Micro (Type D) | Full-size (Type A) |
| Focus | ||
| Phase Detect Points | 399 | 759 |
| Contrast Detect Points | − | − |
| Low Light AF | -2 EV | -6 EV |
| Eye AF | Yes | Yes |
| Animal AF | Yes | Yes |
| Vehicle AF | No | No |
| Viewfinder | ||
| EVF Type | OLED | OLED |
| EVF Resolution | 3.69M dots | 9.44M dots |
| EVF Magnification | 0.78x | 0.91x |
| Monitor | ||
| LCD Size | 3" | 3" |
| LCD Resolution | 1.44M dots | 1.44M dots |
| LCD Type | Tilting | Vari-Angle |
| Touch Screen | Yes | Yes |
| Interface | ||
| Wi-Fi | Wi-Fi 5 | Wi-Fi 5 |
| Bluetooth | v4.2 | v5 |
| USB | USB-C 3.1 Gen 1 | USB-C 3.2 |
| Memory Card Slots | 2x SD (1x UHS-II) | 2x CFexpress Type A / SD UHS-II |
| GPS | No | No |
| General | ||
| Price (MSRP) | $3,199 | $3,499 |
| Body Material | Magnesium Alloy | Magnesium Alloy |
| Dimensions | 126.9×95.6×73.7 mm | 128.9×96.9×80.8 mm |
| Weight | 657g (1.45 lb) | 699g (1.54 lb) |
| Weather Sealed | Yes | Yes |
| In-Body Stabilization | Yes | Yes |
| Battery Life (EVF) | 650 shots | 510 shots |
| Battery Life (LCD) | 800 shots | 600 shots |
| Battery Type | NP-FZ100 | NP-FZ100 |
