A6400vs A7 IV
VS
Which should you buy?
Content Creation & Vlogging — A6400 (2019): 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.
Portrait & Wedding Photography — A7 IV (2021): The full-frame portrait benchmark — 33MP, AI Eye AF, and exceptional skin-tone rendering in a pro-grade hybrid body.
Who should buy what
A6400 (2019)
- 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
A7 IV (2021)
- You want a high-resolution full-frame all-rounder for portraits, weddings, or travel
- You're stepping up from APS-C or a DSLR and want the best all-round full-frame body under £3,000
- You shoot a mix of stills and video and need a single body that handles both seriously
- You want access to the widest lens ecosystem in the mirrorless market
Quick take: The a7 iv has the highest resolution at 33mp; the a6400 is the most affordable; only the a7 iv is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | A6400 (2019) | A7 IV (2021) |
|---|---|---|
| Price | £899 | £2,299 |
| Sensor | 24.2MP APS-C Exmor CMOS BSI | 33MP Full-frame BSI Exmor R CMOS |
| Resolution | 24.2MP | 33.0MP |
| Video | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone |
| Autofocus | Phase-detect, 425 points, real-time Eye AF & animal AF | 759-point phase-detect, AI subject recognition |
| Stabilisation | None (no IBIS) | 5-axis IBIS, 5.5 stops |
| Burst Rate | 11fps mechanical, 8fps with AF tracking | 10fps mechanical, 30fps electronic |
| Battery Life | ~410 shots (CIPA) | ~580 shots (CIPA) |
| Weight | 403g (body, battery, card) | 659g body only |
| Dimensions | 120.0 × 66.9 × 59.7mm | 131.3 × 96.4 × 79.8mm |
| Weather Sealed | No | Yes |
| Viewfinder | EVF, 2.36M dots, 0.70× magnification | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots | 3.0" vari-angle touchscreen |
| Mount | Sony E-mount | Sony FE (full-frame E-mount) |
| Memory Cards | Single SD UHS-I | Dual slots: CFexpress Type A + SD UHS-II |
| Connectivity | Micro-USB, Wi-Fi, Bluetooth, NFC | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi |
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