OM-3vs A6400
OM System
OM-3 (2024)
Starting from £999 new
Best for Travel, outdoor & adventure photography
View OM-3
GearScore™ Verdict — Which should you buy?
Travel, Outdoor & Adventure Photography — OM-3 (2024): The ideal mid-range OM System camera — weather sealed, class-leading IBIS, and superb computational features in a compact body.
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.
Who should buy what
OM-3 (2024)
- Outdoor and adventure photographers who need weather sealing and compact size
- Wildlife and bird photographers wanting improved AF over the OM-5
- Travel shooters who want a rugged, lightweight MFT system
- OM-5 or E-M5 III owners wanting better autofocus without going to the OM-1
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
Quick take: The a6400 has the highest resolution at 24mp; the a6400 is the most affordable; only the om-3 is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-3 (2024) | A6400 (2019) |
|---|---|---|
| Price | £999 | £899 |
| Sensor | 20.4MP Live MOS Micro Four Thirds | 24.2MP APS-C Exmor CMOS BSI |
| Resolution | 20.4MP | 24.2MP |
| Video | 4K/60p (10-bit), C4K/30p, 1080p/120p | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion |
| Autofocus | Phase-detect AF — subject recognition (human, animal, bird, vehicle) | Phase-detect, 425 points, real-time Eye AF & animal AF |
| Stabilisation | IBIS — up to 6.5 stops (7.5 stops with Sync IS lenses) | None (no IBIS) |
| Burst Rate | 10fps mechanical, 30fps electronic with AF | 11fps mechanical, 8fps with AF tracking |
| Battery Life | ~400 shots (CIPA) | ~410 shots (CIPA) |
| Weight | 414g (with battery) | 403g (body, battery, card) |
| Dimensions | 122.3 × 84.6 × 49.4mm | 120.0 × 66.9 × 59.7mm |
| Weather Sealed | Yes | No |
| Viewfinder | EVF, 2.36M dots, 0.74× magnification | EVF, 2.36M dots, 0.70× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots |
| Mount | Micro Four Thirds | Sony E-mount |
| Memory Cards | Single SD UHS-II slot | Single SD UHS-I |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Micro-USB, Wi-Fi, Bluetooth, NFC |
Suitability by genre
| Genre | OM-3 | A6400 |
|---|---|---|
| Travel | ||
| Wildlife | ||
| Landscape | — | |
| Street | ||
| Portrait | ||
| Vlogging & Video | — | |
| Video | — |
More comparisons with OM-3
Camera family history