OM System OM-1 Mark IIvs A7R IV
OM System
OM System OM-1 Mark II (2024)
Starting from £1999 new
Best for Wildlife, birds & outdoor sports
View OM System OM-1 Mark II
VS
GearScore™ Verdict — Which should you buy?
Wildlife, Birds & Outdoor Sports — OM System OM-1 Mark II (2024): OM System's most capable camera — 120fps AF burst, AI subject detection, and IP53 weather sealing make it the best-value pro wildlife camera.
Landscape, Studio, Commercial — A7R IV (2019): 61MP in a mirrorless body — the resolution benchmark.
Who should buy what
OM System OM-1 Mark II (2024)
- Wildlife and bird photographers who need the best subject tracking in MFT
- Sports photographers who want weather sealing and 50fps burst
- OM-1 owners looking for a meaningful autofocus upgrade
- Professionals who need pro-grade weather sealing in the lightest possible system
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 system om-1 mark ii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM System OM-1 Mark II (2024) | A7R IV (2019) |
|---|---|---|
| Price | £1,999 | £2,199 |
| Sensor | 20MP Micro Four Thirds Live MOS | Full-frame BSI Exmor R CMOS 35mm |
| Resolution | 20.0MP | 61.0MP |
| Video | 4K/60p, 1080p/240p, 4K HLG | 4K 30fps |
| Autofocus | AI subject detection AF (birds, animals, motorsport) | 567-point phase-detect, real-time tracking |
| Stabilisation | 8.5-stop IBIS | 5-axis IBIS, 5.5 stops |
| Burst Rate | 120fps with AF tracking | 10fps |
| Battery Life | 520 shots (CIPA) | 670 shots (CIPA) |
| Weight | 599g body only | 665g (body only) |
| Dimensions | 134.8 × 91.6 × 72.7mm | 128.9 × 96.4 × 77.5mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | 0.83" OLED EVF, 5.76M dots, 120fps | 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 | Dual SD UHS-II | 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 System OM-1 Mark II | A7R IV |
|---|---|---|
| Wildlife | — | |
| Sports & Action | — | |
| Landscape | — | |
| Travel | — | |
| Portrait | — | |
| Vlogging & Video | — |
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