Sony a7R III vs Sony a7S II
The bottom line
Same line, different generation: the Sony a7R III (2017) moves ahead on burst speed (10fps vs 5fps), resolution (42.4MP vs 12.2MP) and subject-detection AF. The Sony a7S II is still the value pick at $2,999 ($3,199 for the Sony a7R III). If those newer features aren't ones you'll actually use, the Sony a7S II gives you most of the experience for less.
Choose the Sony a7R III if…
- ✓You shoot action, sports or wildlife — 10fps burst plus dedicated subject-tracking AF keeps up with fast, erratic movement where 5fps would drop frames.
- ✓You want maximum detail for landscapes, studio or large prints — 42.4MP resolves noticeably more than 12.2MP and gives more cropping latitude.
- ✓You need backup-while-you-shoot reliability — dual card slots (the other has one) matter for paid work like weddings and events.
- ✓You work outdoors — it's weather-sealed for rain and dust, the other isn't.
Choose the Sony a7S II if…
- ✓You shoot in low light or indoors — a higher native ISO ceiling (102,400) gives it the edge after dark.
Where they differ
- ›Resolution: 42.4MP on the Sony a7R III vs 12.2MP — more detail and crop room, at the cost of larger files.
- ›Price: the Sony a7S II launched at $2,999, $200 under the Sony a7R III — money that could go toward glass.
- ›Burst: the Sony a7R III shoots 10fps to the Sony a7S II's 5fps — the gap that decides whether you nail the peak moment in sports and wildlife.
- ›Card slots: the Sony a7R III has dual slots for instant backup — the reliability paid work depends on.
- ›Durability: the Sony a7R III is weather-sealed against dust and rain; the other isn't.
- ›Weight: the Sony a7S II is 584g (1.29 lb) vs 657g (1.45 lb) — 73g you'll feel on a long day out.
Frequently asked
Is the Sony a7R III or the Sony a7S II better?
Same line, different generation: the Sony a7R III (2017) moves ahead on burst speed (10fps vs 5fps), resolution (42.4MP vs 12.2MP) and subject-detection AF. The Sony a7S II is still the value pick at $2,999 ($3,199 for the Sony a7R III). If those newer features aren't ones you'll actually use, the Sony a7S II gives you most of the experience for less.
Who should choose the Sony a7R III?
Choose the Sony a7R III if you shoot action, sports or wildlife — 10fps burst plus dedicated subject-tracking AF keeps up with fast, erratic movement where 5fps would drop frames. Choose it if you want maximum detail for landscapes, studio or large prints — 42.4MP resolves noticeably more than 12.2MP and gives more cropping latitude. Choose it if you need backup-while-you-shoot reliability — dual card slots (the other has one) matter for paid work like weddings and events. Choose it if you work outdoors — it's weather-sealed for rain and dust, the other isn't.
Who should choose the Sony a7S II?
Choose the Sony a7S II if you shoot in low light or indoors — a higher native ISO ceiling (102,400) gives it the edge after dark.
What is the main difference between the Sony a7R III and the Sony a7S II?
Resolution: 42.4MP on the Sony a7R III vs 12.2MP — more detail and crop room, at the cost of larger files.
| Product | ||
|---|---|---|
| Imaging | ||
| Sensor Type | BSI CMOS | CMOS |
| Sensor Size | Full-Frame | Full-Frame |
| Image Processor | BIONZ X | BIONZ X |
| Effective Resolution | 42.4 MP | 12.2 MP |
| Lens Mount | Sony E | Sony E |
| Exposure Control | ||
| ISO Range (Native) | 100 – 32000 | 100 – 102400 |
| ISO Range (Extended) | 50 – 102400 | 50 – 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 | 5 fps |
| Video Capture | ||
| Max Resolution | 4K | 4K |
| 8K Recording | − | − |
| 4K Recording | Up to 30p | Up to 30p |
| 1080p Recording | Up to 120p | Up to 120p |
| 10-bit Internal | Yes | Yes |
| Recording Limit | 29 min | 29 min |
| Log Profiles | S-Log3 / HLG | S-Log2 / S-Log3 / HLG |
| Built-in Mic | Stereo | Stereo |
| Headphone Jack | Yes | Yes |
| Mic Input | Yes | Yes |
| HDMI Output | Micro (Type D) | Micro (Type D) |
| Focus | ||
| Phase Detect Points | 399 | − |
| Contrast Detect Points | − | − |
| Low Light AF | -2 EV | − |
| Eye AF | Yes | No |
| Animal AF | Yes | No |
| Vehicle AF | No | No |
| Viewfinder | ||
| EVF Type | OLED | OLED |
| EVF Resolution | 3.69M dots | 2.36M dots |
| EVF Magnification | 0.78x | 0.78x |
| Monitor | ||
| LCD Size | 3" | 3" |
| LCD Resolution | 1.44M dots | 1.23M dots |
| LCD Type | Tilting | Tilting |
| Touch Screen | Yes | Yes |
| Interface | ||
| Wi-Fi | Wi-Fi 5 | Wi-Fi 5 |
| Bluetooth | v4.2 | v4.2 |
| USB | USB-C 3.1 Gen 1 | Micro USB 2.0 |
| Memory Card Slots | 2x SD (1x UHS-II) | 1x SD UHS-I |
| GPS | No | No |
| General | ||
| Price (MSRP) | $3,199 | $2,999 |
| Body Material | Magnesium Alloy | Magnesium Alloy |
| Dimensions | 126.9×95.6×73.7 mm | 126.9×95.7×60.3 mm |
| Weight | 657g (1.45 lb) | 584g (1.29 lb) |
| Weather Sealed | Yes | No |
| In-Body Stabilization | Yes | Yes |
| Battery Life (EVF) | 650 shots | 310 shots |
| Battery Life (LCD) | 800 shots | 370 shots |
| Battery Type | NP-FZ100 | NP-FW50 |
