Sony
FX3 2021
Best for Professional video, documentary & cinematic filmmaking
£3579
new today at Clifton Cameras
Decision tools · Compare
FX3 vs Sony RX1R III
Quick take: The Sony RX1R III has the highest resolution at 61MP; the FX3 is the most affordable; only the FX3 is weather sealed.
16 specs side by side·15 genres scored·UK prices from Wex Photo Video and Clifton Cameras
How to read this page. Highlighted cells win that row on the spec alone. Genre scores are the engine's base scores (enthusiast, photo and video); Camera Match re-weights them for your level and priorities. Price buttons are affiliate links; the price you pay is the same.
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Verdictwhich should you buy?
FX3 — Professional Video, Documentary & Cinematic Filmmaking: The definitive run-and-gun cinema camera — A7S III sensor quality in a body built specifically for video professionals.
Who should buy what
FX3 (2021)
is the right camera for you if…
- Professional videographers and filmmakers who need cinema-quality colour science in a compact body
- Documentary and run-and-gun shooters who need 4K/120p and built-in XLR audio
- Sony A7S III owners who want a purpose-built video body alongside their stills camera
- Gimbal and drone operators who need a compact full-frame cinema camera
Full specificationsthe better value in each row is highlighted
| Specification | FX3Sony · 2021 | Sony RX1R IIISony · 2025 |
|---|---|---|
| Price | £3,579Best | £3,899 |
| Sensor | 12.1MP full-frame BSI Exmor R CMOS (same as A7S III) | 61MP full-frame Exmor R BSI CMOS |
| Resolution | 12.1MP | 61.0MPBest |
| Video | 4K/120p, 4K/60p 10-bit, 12-bit RAW output, S-Log3, S-Cinetone | 4K/30p, 10-bit |
| Autofocus | Real-time tracking with subject recognition (human, animal) | Hybrid phase-detect AF (693 points) with eye detection |
| Stabilisation | 5-axis IBIS — 5 stops | No stabilisation |
| Burst Rate | 10fps mechanical, 10fps electronicBest | 5fps |
| Battery Life | ~640 shots (CIPA)Best | 300 shots (CIPA, LCD) |
| Weight | 715g (body only) | 496g (with battery and card)Best |
| Dimensions | 129.7 × 78.0 × 84.5mm | — |
| Weather Sealed | YesBest | Not weather sealed |
| Viewfinder | None — monitor/external EVF use only | EVF, 2.36M dots |
| Screen | 3.0" touchscreen, fully articulating | Tilting touchscreen |
| Mount | Sony FE mount (full-frame E-mount) | Fixed 35mm f/2 Zeiss Sonnar lens |
| Memory Cards | Dual CFexpress Type A / SD UHS-II slots | Single SD (UHS-II) |
| Connectivity | USB-C (10Gbps), full-size HDMI, XLR via handle, Bluetooth, Wi-Fi | USB-C, Wi-Fi, Bluetooth |
Wins the row — price, resolution, burst, battery, weight and sealing are compared; text specs aren't ranked.
How they score by genreengine base scores out of 10
Genre
FX3
Sony RX1R III
Portrait
5.7/10
5.9/10
Street
4.3/10
7.6/10
Travel
5.6/10
6.1/10
Wedding & Events
6.0/10
5.7/10
Vlogging & Video
6.2/10
—
Filmmaking
9.1/10
5.3/10
Documentary
8.0/10
5.5/10
Sports & Action
5.5/10
—
Landscape
4.7/10
5.7/10
Wildlife
5.8/10
—
Casual
4.8/10
4.6/10
Food
6.7/10
6.3/10
Macro
5.5/10
4.8/10
Architecture
5.2/10
6.0/10
Astrophotography
6.7/10
6.2/10
Scores come from the same engine as Camera Match: verified specifications weighted by what each genre needs, with documented adjustments. The product page and this table show the enthusiast base score. See how scores are calculated →
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