Decision tools · Compare
A7 III vs FX3
Quick take: The A7 III has the highest resolution at 24MP; the A7 III is the most affordable.
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.
Sony
FX3 2021
Best for Professional video, documentary & cinematic filmmaking
£2999
new today at Wex Photo Video
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Verdictwhich should you buy?
A7 III — All-Round Photography & Video: Still one of the best all-round cameras money can buy — particularly strong used. The A7 III proved that full-frame doesn't have to mean compromises, and nothing at this price point has meaningfully beaten it.
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
A7 III (2018)
is the right camera for you if…
- Enthusiast photographers upgrading from APS-C for the first time
- Working photographers who need reliable AF and weather sealing
- Anyone who shoots in low light regularly
- Hybrid shooters needing both stills and video performance
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 | A7 IIISony · 2018 | FX3Sony · 2021 |
|---|---|---|
| Price | £1,099Best | £2,999 |
| Sensor | 24.2MP Full-Frame Exmor R BSI CMOS | 12.1MP full-frame BSI Exmor R CMOS (same as A7S III) |
| Resolution | 24.2MPBest | 12.1MP |
| Video | 4K/30p (6K oversampled), 1080p/120p slow-motion | 4K/120p, 4K/60p 10-bit, 12-bit RAW output, S-Log3, S-Cinetone |
| Autofocus | Phase-detect, 693 points, real-time Eye AF & animal AF | Real-time tracking with subject recognition (human, animal) |
| Stabilisation | 5-axis IBIS, 5 stops | 5-axis IBIS — 5 stops |
| Burst Rate | 10fps with AF/AE tracking | 10fps mechanical, 10fps electronic |
| Battery Life | ~710 shots (CIPA)Best | ~640 shots (CIPA) |
| Weight | 565g (body only)Best | 715g (body only) |
| Dimensions | 126.9 × 95.6 × 73.7mm | 129.7 × 78.0 × 84.5mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.78× magnification | None — monitor/external EVF use only |
| Screen | 3.0" tilting touchscreen, 921k dots | 3.0" touchscreen, fully articulating |
| Mount | Sony E-mount | Sony FE mount (full-frame E-mount) |
| Memory Cards | Dual SD (UHS-II slot 1, UHS-I slot 2) | Dual CFexpress Type A / SD UHS-II slots |
| Connectivity | USB-C (USB 3.2), Wi-Fi, Bluetooth, NFC | USB-C (10Gbps), full-size HDMI, XLR via handle, Bluetooth, Wi-Fi |
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
A7 III
FX3
Portrait
7.6/10
5.7/10
Street
6.2/10
4.3/10
Travel
6.1/10
5.5/10
Wedding & Events
7.5/10
6.0/10
Filmmaking
6.4/10
9.1/10
Documentary
6.8/10
8.0/10
Sports & Action
7.3/10
5.5/10
Landscape
6.2/10
4.7/10
Wildlife
7.5/10
5.8/10
Casual
5.4/10
4.9/10
Food
6.6/10
6.7/10
Macro
5.8/10
5.5/10
Architecture
6.1/10
5.2/10
Astrophotography
7.4/10
6.7/10
Vlogging & Video
—
6.1/10
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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