OM-3vs A7R II
OM System
OM-3 (2024)
Starting from £999 new
Best for Travel, outdoor & adventure photography
View OM-3
Sony
A7R II (2015)
Starting from £799 new
Best for Portrait, landscape & studio photography
View A7R II
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.
Portrait, Landscape & Studio Photography — A7R II (2015): The A7R II transformed the A7R series — adding IBIS, 4K video, BSI sensor tech, and phase-detect AF in one generation. A landmark Sony camera.
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 II (2015)
- Landscape and architecture photographers who want 42MP with IBIS for handheld shooting
- Portrait and studio photographers who need high resolution with improved AF reliability
- Sony FE system users who want a capable high-resolution body at a used price
- A7R I owners who need the stabilisation, 4K, and improved AF the original lacked
Quick take: The a7r ii has the highest resolution at 42mp; the a7r ii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-3 (2024) | A7R II (2015) |
|---|---|---|
| Price | £999 | £799 |
| Sensor | 20.4MP Live MOS Micro Four Thirds | 42.4MP Full-Frame BSI CMOS Exmor R |
| Resolution | 20.4MP | 42.4MP |
| Video | 4K/60p (10-bit), C4K/30p, 1080p/120p | 4K/30p (S35 or full-frame), 1080p/120p |
| Autofocus | Phase-detect AF — subject recognition (human, animal, bird, vehicle) | 399 phase-detect + 25 contrast-detect AF points, face detection |
| Stabilisation | IBIS — up to 6.5 stops (7.5 stops with Sync IS lenses) | IBIS — 5-axis, up to 4.5 stops (first A7R with IBIS) |
| Burst Rate | 10fps mechanical, 30fps electronic with AF | 5fps |
| Battery Life | ~400 shots (CIPA) | ~290 shots (CIPA) |
| Weight | 414g (with battery) | 625g (with battery and card) |
| Dimensions | 122.3 × 84.6 × 49.4mm | 126.9 × 95.7 × 60.3mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.74× magnification | EVF, OLED 2.36M dots, 0.78× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.0" tilting LCD, 1.23M dots (no touch) |
| Mount | Micro Four Thirds | Sony FE (full-frame E-mount) |
| Memory Cards | Single SD UHS-II slot | Single SD UHS-I slot |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB, Wi-Fi, NFC |
Suitability by genre
| Genre | OM-3 | A7R II |
|---|---|---|
| Travel | ||
| Wildlife | — | |
| Landscape | ||
| Street | — | |
| Portrait | ||
| Vlogging & Video | ||
| Architecture | — | |
| Sports & Action | — |
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