OM System OM-1 Mark IIvs A1 II
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
Sony
A1 II (2025)
Starting from £6500 new
Best for Professional sports, wildlife & high-resolution studio work
View A1 II
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.
Professional Sports, Wildlife & High-Resolution Studio Work — A1 II (2025): The most complete camera ever made — 50MP, 30fps, 8K, and the world's best EVF in a single flagship body.
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
A1 II (2025)
- Professional sports and wildlife photographers who need 30fps, 50MP, and the best AF available
- Commercial and advertising photographers who demand 50MP resolution alongside pro video specs
- Photojournalists who need a single body capable of handling every assignment
- Sony system shooters ready to invest in the absolute best
Quick take: The a1 ii has the highest resolution at 50mp; 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) | A1 II (2025) |
|---|---|---|
| Price | £1,999 | £6,500 |
| Sensor | 20MP Micro Four Thirds Live MOS | 50.1MP full-frame stacked BSI CMOS |
| Resolution | 20.0MP | 50.1MP |
| Video | 4K/60p, 1080p/240p, 4K HLG | 8K/30p, 4K/120p 10-bit, 4K/240p super slow-motion |
| Autofocus | AI subject detection AF (birds, animals, motorsport) | AI subject recognition — human, animal, bird, insect, vehicle, aircraft, train |
| Stabilisation | 8.5-stop IBIS | 8.5-stop IBIS (with in-lens OSS) |
| Burst Rate | 120fps with AF tracking | 30fps electronic (with full AF/AE), 10fps mechanical |
| Battery Life | 520 shots (CIPA) | ~530 shots (CIPA) |
| Weight | 599g body only | 743g body only |
| Dimensions | 134.8 × 91.6 × 72.7mm | 136.1 × 96.9 × 82.9mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | 0.83" OLED EVF, 5.76M dots, 120fps | EVF 0.9× 9.44M-dot — the highest resolution EVF available |
| Screen | 3.0" fully articulating touchscreen | 3.2" fully articulating touchscreen, 2.1M dots |
| Mount | Micro Four Thirds | Sony E-mount (full-frame) |
| Memory Cards | Dual SD UHS-II | Dual CFexpress Type A / SD UHS-II slots |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C 3.2 Gen 2, Wi-Fi 6GHz, Bluetooth 5.3, HDMI full-size |
Suitability by genre
| Genre | OM System OM-1 Mark II | A1 II |
|---|---|---|
| Wildlife | ||
| Sports & Action | — | |
| Landscape | ||
| Travel | ||
| Portrait | ||
| Vlogging & Video | ||
| Sports | — |
More comparisons with OM System OM-1 Mark II
Camera family history