OM-1vs A7R III
VS
Sony
A7R III (2017)
Starting from £1799 new
Best for Landscape, studio & commercial photography
View A7R 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.
Landscape, Studio & Commercial Photography — A7R III (2017): The camera that converted professionals to mirrorless — 42MP, IBIS, and 10fps in a body that still competes today.
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
A7R III (2017)
- Landscape and studio photographers who need 42MP resolution at a used-price discount vs A7R IV
- Canon/Nikon DSLR professionals considering a mirrorless switch at a lower investment
- Commercial and product photographers who want full-frame resolution with IBIS for handheld work
- Portrait photographers who want the sharpest possible full-frame files for large print work
Quick take: The a7r iii has the highest resolution at 42mp; the om-1 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-1 (2022) | A7R III (2017) |
|---|---|---|
| Price | £1,299 | £1,799 |
| Sensor | Micro Four Thirds Live MOS stacked BSI | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 20.4MP | 42.4MP |
| Video | 4K 60fps 10-bit | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | 1053-point cross-type phase-detect, AI subject recognition | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | 5-axis IBIS, 7.0 stops (8 stops with sync IS) | 5-axis IBIS — 5.5 stops |
| Burst Rate | 10fps mechanical, 50fps electronic, 120fps Pro Capture | 10fps with AF/AE tracking |
| Battery Life | 520 shots (CIPA) | ~650 shots (CIPA) |
| Weight | 599g (body only) | 650g body only |
| 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, 3.69M dots, 0.78× magnification |
| Screen | 3.0" fully articulating touchscreen, 1.62M-dot | 3.0" touchscreen, tilting |
| Mount | Micro Four Thirds | Sony FE mount (full-frame E-mount) |
| Memory Cards | 2× SD UHS-II / CFexpress Type B | Dual SD slots (one UHS-II) |
| Connectivity | Wi-Fi 5GHz, Bluetooth 5.0, USB-C 3.1, HDMI, 3.5mm mic/headphone | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack |
Suitability by genre
| Genre | OM-1 | A7R III |
|---|---|---|
| Landscape | — | |
| Portrait | — | |
| Vlogging & Video | — | |
| Wedding | — | |
| Street | — | |
| Sports | — |
More comparisons with OM-1
Camera family history