Sony a9 III vs Sony FX3
The bottom line
Same line, different generation: the Sony a9 III (2024) moves ahead on burst speed (120fps vs 10fps), resolution (24.6MP vs 12.1MP) and subject-detection AF. The Sony FX3 is still the value pick at $3,899 ($5,999 for the Sony a9 III). If those newer features aren't ones you'll actually use, the Sony FX3 gives you most of the experience for less.
Choose the Sony a9 III if…
- ✓You shoot action, sports or wildlife — 120fps burst plus dedicated subject-tracking AF keeps up with fast, erratic movement where 10fps would drop frames.
- ✓You want maximum detail for landscapes, studio or large prints — 24.6MP resolves noticeably more than 12.1MP and gives more cropping latitude.
Choose the Sony FX3 if…
- ✓You're budget-conscious — it launched at $3,899, about $2,100 less, freeing money for lenses.
- ✓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
- ›Burst: the Sony a9 III shoots 120fps to the Sony FX3's 10fps — the gap that decides whether you nail the peak moment in sports and wildlife.
- ›Price: the Sony FX3 launched at $3,899, $2,100 under the Sony a9 III — money that could go toward glass.
- ›Resolution: 24.6MP on the Sony a9 III vs 12.1MP — more detail and crop room, at the cost of larger files.
Frequently asked
Is the Sony a9 III or the Sony FX3 better?
Same line, different generation: the Sony a9 III (2024) moves ahead on burst speed (120fps vs 10fps), resolution (24.6MP vs 12.1MP) and subject-detection AF. The Sony FX3 is still the value pick at $3,899 ($5,999 for the Sony a9 III). If those newer features aren't ones you'll actually use, the Sony FX3 gives you most of the experience for less.
Who should choose the Sony a9 III?
Choose the Sony a9 III if you shoot action, sports or wildlife — 120fps burst plus dedicated subject-tracking AF keeps up with fast, erratic movement where 10fps would drop frames. Choose it if you want maximum detail for landscapes, studio or large prints — 24.6MP resolves noticeably more than 12.1MP and gives more cropping latitude.
Who should choose the Sony FX3?
Choose the Sony FX3 if you're budget-conscious — it launched at $3,899, about $2,100 less, freeing money for lenses. 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 a9 III and the Sony FX3?
Burst: the Sony a9 III shoots 120fps to the Sony FX3's 10fps — the gap that decides whether you nail the peak moment in sports and wildlife.
| Product | ||
|---|---|---|
| Imaging | ||
| Sensor Type | Global Shutter CMOS | BSI CMOS |
| Sensor Size | Full-Frame | Full-Frame |
| Image Processor | BIONZ XR | BIONZ XR |
| Effective Resolution | 24.6 MP | 12.1 MP |
| Lens Mount | Sony E | Sony E |
| Exposure Control | ||
| ISO Range (Native) | 250 – 25600 | 80 – 102400 |
| ISO Range (Extended) | 125 – 51200 | 40 – 409600 |
| Mechanical Shutter | − | − |
| Electronic Shutter | 1/80000 | 1/8000 |
| Flash Sync Speed | 1/80000 | 1/250 |
| Built-in Flash | No | No |
| Still Image Capture | ||
| Continuous Shooting | 120 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 | 425 | − |
| Low Light AF | -5 EV | -6 EV |
| Eye AF | Yes | Yes |
| Animal AF | Yes | Yes |
| Vehicle AF | Yes | No |
| Viewfinder | ||
| EVF Type | OLED | − |
| EVF Resolution | 9.44M dots | − |
| EVF Magnification | 0.9x | − |
| Monitor | ||
| LCD Size | 3.2" | 3" |
| LCD Resolution | 2.10M dots | 1.44M dots |
| LCD Type | 4-Axis Tilting | Vari-Angle |
| Touch Screen | Yes | Yes |
| Interface | ||
| Wi-Fi | Wi-Fi 6 | Wi-Fi 5 |
| Bluetooth | v5.3 | v5 |
| USB | USB-C 3.2 Gen 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) | $5,999 | $3,899 |
| Body Material | Magnesium Alloy | Magnesium Alloy |
| Dimensions | 136.1×96.9×82.9 mm | 129.7×77.8×84.5 mm |
| Weight | 703g (1.55 lb) | 715g (1.58 lb) |
| Weather Sealed | Yes | Yes |
| In-Body Stabilization | Yes | Yes |
| Battery Life (EVF) | 520 shots | − |
| Battery Life (LCD) | 530 shots | 600 shots |
| Battery Type | NP-FZ100 | NP-FZ100 |
