OM System OM-1 Mark IIvs A7
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
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.
Camera History & Full-Frame Introduction — A7 (2013): The camera that changed photography — the world's first compact full-frame mirrorless, the A7 launched a product family that redefined what was possible.
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
A7 (2013)
- Photographers interested in the camera that launched the full-frame mirrorless era
- Budget-conscious buyers who want to experience full-frame image quality at minimal cost
- Sony FE system users who want the original A7 for sentimental or historical value
- Those adapting vintage lenses who want full-frame with phase-detect AF at low cost
Quick take: The a7 has the highest resolution at 24mp; the a7 is the most affordable; only the om system om-1 mark ii is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM System OM-1 Mark II (2024) | A7 (2013) |
|---|---|---|
| Price | £1,999 | £299 |
| Sensor | 20MP Micro Four Thirds Live MOS | 24.3MP Full-Frame CMOS |
| Resolution | 20.0MP | 24.3MP |
| Video | 4K/60p, 1080p/240p, 4K HLG | 1080p/60p |
| Autofocus | AI subject detection AF (birds, animals, motorsport) | 117 phase-detect + 25 contrast-detect AF points |
| Stabilisation | 8.5-stop IBIS | None |
| Burst Rate | 120fps with AF tracking | 5fps |
| Battery Life | 520 shots (CIPA) | ~340 shots (CIPA) |
| Weight | 599g body only | 474g (with battery and card) |
| Dimensions | 134.8 × 91.6 × 72.7mm | 126.9 × 94.4 × 48.2mm |
| Weather Sealed | Yes | No |
| Viewfinder | 0.83" OLED EVF, 5.76M dots, 120fps | EVF, OLED 2.36M dots, 0.71× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.0" fixed LCD, 1.23M dots (no tilt, no touch) |
| Mount | Micro Four Thirds | Sony FE (full-frame E-mount) |
| Memory Cards | Dual SD UHS-II | Single SD UHS-I slot |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB, Wi-Fi, NFC |
Suitability by genre
| Genre | OM System OM-1 Mark II | A7 |
|---|---|---|
| Wildlife | — | |
| Sports & Action | ||
| Landscape | ||
| Travel | ||
| Portrait | ||
| Vlogging & Video | ||
| Street | — |
GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →
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Camera family history