Decision tools · Compare
A6400 vs FX3
Quick take: The A6400 has the highest resolution at 24MP; the A6400 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?
A6400 — Content Creation & Vlogging: The best value APS-C Sony you can buy — especially used. Real-time Eye AF at this price point was transformative when it launched and still makes it one of the most reliable autofocus systems in the lineup.
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
A6400 (2019)
is the right camera for you if…
- Vloggers and content creators who need a flip screen and reliable AF
- Photographers upgrading from a compact or smartphone
- Beginners who want room to grow into a full E-mount lens ecosystem
- Anyone prioritising autofocus performance at an accessible price
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 | A6400Sony · 2019 | FX3Sony · 2021 |
|---|---|---|
| Price | £749Best | £2,999 |
| Sensor | 24.2MP APS-C Exmor CMOS BSI | 12.1MP full-frame BSI Exmor R CMOS (same as A7S III) |
| Resolution | 24.2MPBest | 12.1MP |
| Video | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion | 4K/120p, 4K/60p 10-bit, 12-bit RAW output, S-Log3, S-Cinetone |
| Autofocus | Phase-detect, 425 points, real-time Eye AF & animal AF | Real-time tracking with subject recognition (human, animal) |
| Stabilisation | No stabilisation | 5-axis IBIS — 5 stops |
| Burst Rate | 11fps mechanical, 8fps with AF trackingBest | 10fps mechanical, 10fps electronic |
| Battery Life | ~410 shots (CIPA) | ~640 shots (CIPA)Best |
| Weight | 403g (with battery and card)Best | 715g (body only) |
| Dimensions | 120.0 × 66.9 × 59.7mm | 129.7 × 78.0 × 84.5mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.70× magnification | None — monitor/external EVF use only |
| Screen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots | 3.0" touchscreen, fully articulating |
| Mount | Sony E-mount | Sony FE mount (full-frame E-mount) |
| Memory Cards | Single SD UHS-I | Dual CFexpress Type A / SD UHS-II slots |
| Connectivity | Micro-USB, 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
A6400
FX3
Portrait
6.7/10
5.7/10
Street
7.3/10
4.3/10
Travel
6.7/10
5.5/10
Wedding & Events
5.6/10
6.0/10
Vlogging & Video
5.8/10
6.1/10
Filmmaking
5.1/10
9.1/10
Documentary
6.1/10
8.0/10
Sports & Action
6.9/10
5.5/10
Landscape
5.6/10
4.7/10
Wildlife
7.4/10
5.8/10
Casual
5.8/10
4.9/10
Food
6.1/10
6.7/10
Macro
5.2/10
5.5/10
Architecture
5.5/10
5.2/10
Astrophotography
6.0/10
6.7/10
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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