OM-1vs A7 III
VS
Which should you buy?
Wildlife, Sport, Outdoor — OM-1 (2022): OM System's statement camera — class-leading weather sealing and the best IBIS in the business.
All-Round Photography & Video — A7 III (2018): 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.
Who should buy what
OM-1 (2022)
- Wildlife and bird photographers who need fast burst and pro weather sealing
- Outdoor photographers who work in challenging conditions
A7 III (2018)
- 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
Quick take: The a7 iii has the highest resolution at 24mp; the om-1 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-1 (2022) | A7 III (2018) |
|---|---|---|
| Price | £1,299 | £1,699 |
| Sensor | Micro Four Thirds Live MOS stacked BSI | 24.2MP Full-Frame Exmor R BSI CMOS |
| Resolution | 20.4MP | 24.2MP |
| Video | 4K 60fps 10-bit | 4K/30p (6K oversampled), 1080p/120p slow-motion |
| Autofocus | 1053-point cross-type phase-detect, AI subject recognition | Phase-detect, 693 points, real-time Eye AF & animal AF |
| Stabilisation | 5-axis IBIS, 7.0 stops (8 stops with sync IS) | 5-axis IBIS, 5 stops |
| Burst Rate | 10fps mechanical, 50fps electronic, 120fps Pro Capture | 10fps with AF/AE tracking |
| Battery Life | 520 shots (CIPA) | ~710 shots (CIPA) |
| Weight | 599g (body only) | 565g (body, battery, card) |
| Dimensions | 134.8 × 91.6 × 72.7mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.83× 5.76M-dot | EVF, 2.36M dots, 0.78× magnification |
| Screen | 3.0" fully articulating touchscreen, 1.62M-dot | 3.0" tilting touchscreen, 921k dots |
| Mount | Micro Four Thirds | Sony E-mount |
| Memory Cards | 2× SD UHS-II / CFexpress Type B | Dual SD (UHS-II slot 1, UHS-I slot 2) |
| Connectivity | Wi-Fi 5GHz, Bluetooth 5.0, USB-C 3.1, HDMI, 3.5mm mic/headphone | USB-C (USB 3.2), Wi-Fi, Bluetooth, NFC |
Suitability by genre
| Genre | OM-1 | A7 III |
|---|---|---|
| Portrait | — | |
| Travel | — | |
| Street | — | |
| Wildlife | — | |
| Video | — |
More comparisons with OM-1
Camera family history