OM-1vs A7S III
Sony
A7S III (2020)
Starting from £2999 new
Best for Professional video & low-light filmmaking
View A7S III
GearScore™ Verdict — 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.
Professional Video & Low-Light Filmmaking — A7S III (2020): If video is your primary discipline, the A7S III is the camera. 4K/120p at 10-bit in a weather-sealed body with a 9.44M dot EVF is an extraordinary package. The 12MP sensor isn't limiting for video — and it's usable at ISO 409,600 in a pinch.
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
A7S III (2020)
- Filmmakers and videographers who need 4K/120p at 10-bit
- Event videographers who shoot in dark venues regularly
- Documentary filmmakers who need reliable AF and weather sealing
- Hybrid shooters where video is primary and stills are secondary
Quick take: The om-1 has the highest resolution at 20mp; the om-1 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-1 (2022) | A7S III (2020) |
|---|---|---|
| Price | £1,299 | £2,999 |
| Sensor | Micro Four Thirds Live MOS stacked BSI | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) |
| Resolution | 20.4MP | 12.1MP |
| Video | 4K 60fps 10-bit | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p |
| Autofocus | 1053-point cross-type phase-detect, AI subject recognition | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition |
| Stabilisation | 5-axis IBIS, 7.0 stops (8 stops with sync IS) | 5.5-stop IBIS |
| Burst Rate | 10fps mechanical, 50fps electronic, 120fps Pro Capture | 10fps mechanical |
| Battery Life | 520 shots (CIPA) | ~600 shots (CIPA) / ~70min continuous 4K recording |
| Weight | 599g (body only) | 699g (body, battery, card) |
| Dimensions | 134.8 × 91.6 × 72.7mm | 128.9 × 96.9 × 80.8mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.83× 5.76M-dot | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made |
| Screen | 3.0" fully articulating touchscreen, 1.62M-dot | 3.0" vari-angle touchscreen, 1.44M dots |
| Mount | Micro Four Thirds | Sony E-mount |
| Memory Cards | 2× SD UHS-II / CFexpress Type B | Dual CFexpress Type A / SD UHS-II (both slots) |
| Connectivity | Wi-Fi 5GHz, Bluetooth 5.0, USB-C 3.1, HDMI, 3.5mm mic/headphone | USB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth |
Suitability by genre
| Genre | OM-1 | A7S III |
|---|---|---|
| Video | — | |
| Wildlife | — | |
| Street | — | |
| Portrait | — | |
| Travel | — |
More comparisons with OM-1
Camera family history