Camera Comparison
Sony a7S III vs Sony FX3
The bottom line
These two are closely matched. The differences below are where they diverge — weigh the ones that map to how you actually shoot, and let price and handling break the tie.
Where they differ
- ›Price: the Sony a7S III launched at $3,499, $400 under the Sony FX3 — money that could go toward glass.
Frequently asked
Is the Sony a7S III or the Sony FX3 better?
These two are closely matched. The differences below are where they diverge — weigh the ones that map to how you actually shoot, and let price and handling break the tie.
What is the main difference between the Sony a7S III and the Sony FX3?
Price: the Sony a7S III launched at $3,499, $400 under the Sony FX3 — money that could go toward glass.
| Product | ||
|---|---|---|
| Imaging | ||
| Sensor Type | BSI CMOS | BSI CMOS |
| Sensor Size | Full-Frame | Full-Frame |
| Image Processor | BIONZ XR | BIONZ XR |
| Effective Resolution | 12.1 MP | 12.1 MP |
| Lens Mount | Sony E | Sony E |
| Exposure Control | ||
| ISO Range (Native) | 80 – 102400 | 80 – 102400 |
| ISO Range (Extended) | 40 – 409600 | 40 – 409600 |
| Mechanical Shutter | 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 120p | Up to 120p |
| 1080p Recording | Up to 240p | Up to 240p |
| 10-bit Internal | Yes | Yes |
| Recording Limit | No limit | No limit |
| Log Profiles | S-Log3 / HLG / S-Cinetone | S-Log3 / HLG / S-Cinetone |
| Built-in Mic | Stereo | Stereo (XLR via top handle) |
| Headphone Jack | Yes | Yes |
| Mic Input | Yes | Yes |
| HDMI Output | Full-size (Type A) | Full-size (Type A) |
| Focus | ||
| Phase Detect Points | 759 | 759 |
| Contrast Detect Points | − | − |
| Low Light AF | -6 EV | -6 EV |
| Eye AF | Yes | Yes |
| Animal AF | Yes | Yes |
| Vehicle AF | No | No |
| Viewfinder | ||
| EVF Type | OLED | − |
| EVF Resolution | 9.44M dots | − |
| EVF Magnification | 0.91x | − |
| Monitor | ||
| LCD Size | 3" | 3" |
| LCD Resolution | 1.44M dots | 1.44M dots |
| LCD Type | Vari-Angle | Vari-Angle |
| Touch Screen | Yes | Yes |
| Interface | ||
| Wi-Fi | Wi-Fi 5 | Wi-Fi 5 |
| Bluetooth | v5 | v5 |
| USB | USB-C 3.2 | USB-C 3.2 |
| Memory Card Slots | 2x CFexpress Type A / SD UHS-II | 2x CFexpress Type A / SD UHS-II |
| GPS | No | No |
| General | ||
| Price (MSRP) | $3,499 | $3,899 |
| Body Material | Magnesium Alloy | Magnesium Alloy |
| Dimensions | 128.9×96.9×80.8 mm | 129.7×77.8×84.5 mm |
| Weight | 699g (1.54 lb) | 715g (1.58 lb) |
| Weather Sealed | Yes | Yes |
| In-Body Stabilization | Yes | Yes |
| Battery Life (EVF) | 510 shots | − |
| Battery Life (LCD) | 600 shots | 600 shots |
| Battery Type | NP-FZ100 | NP-FZ100 |
