OM-3vs A7R IV
OM System
OM-3 (2024)
Starting from £999 new
Best for Travel, outdoor & adventure photography
View OM-3
VS
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.
Landscape, Studio, Commercial — A7R IV (2019): 61MP in a mirrorless body — the resolution benchmark.
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
A7R IV (2019)
- Landscape photographers who print large
- Studio shooters needing maximum detail
Quick take: The a7r iv has the highest resolution at 61mp; the om-3 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-3 (2024) | A7R IV (2019) |
|---|---|---|
| Price | £999 | £2,199 |
| Sensor | 20.4MP Live MOS Micro Four Thirds | Full-frame BSI Exmor R CMOS 35mm |
| Resolution | 20.4MP | 61.0MP |
| Video | 4K/60p (10-bit), C4K/30p, 1080p/120p | 4K 30fps |
| Autofocus | Phase-detect AF — subject recognition (human, animal, bird, vehicle) | 567-point phase-detect, real-time tracking |
| Stabilisation | IBIS — up to 6.5 stops (7.5 stops with Sync IS lenses) | 5-axis IBIS, 5.5 stops |
| Burst Rate | 10fps mechanical, 30fps electronic with AF | 10fps |
| Battery Life | ~400 shots (CIPA) | 670 shots (CIPA) |
| Weight | 414g (with battery) | 665g (body only) |
| Dimensions | 122.3 × 84.6 × 49.4mm | 128.9 × 96.4 × 77.5mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.74× magnification | EVF 0.78× 5.76M-dot |
| Screen | 3.0" fully articulating touchscreen | 3.0" tilting touchscreen, 1.44M-dot |
| Mount | Micro Four Thirds | Sony E-Mount |
| Memory Cards | Single SD UHS-II slot | 2× SD UHS-II / CFexpress Type A |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Wi-Fi 5GHz, Bluetooth 4.1, USB-C 3.2 |
Suitability by genre
| Genre | OM-3 | A7R IV |
|---|---|---|
| Travel | — | |
| Wildlife | — | |
| Landscape | — | |
| Street | — | |
| Portrait | — | |
| Vlogging & Video | — |
More comparisons with OM-3
Camera family history