OM-D E-M10 IVvs A7R III
VS
Sony
A7R III (2017)
Starting from £1799 new
Best for Landscape, studio & commercial photography
View A7R III
GearScore™ Verdict — Which should you buy?
Travel & Everyday — OM-D E-M10 IV (2020): Compact Micro Four Thirds body with built-in IBIS — ideal for travellers who want stability without bulk.
Landscape, Studio & Commercial Photography — A7R III (2017): The camera that converted professionals to mirrorless — 42MP, IBIS, and 10fps in a body that still competes today.
Who should buy what
OM-D E-M10 IV (2020)
- Beginners and enthusiasts who want a compact, stylish Micro Four Thirds camera
- Travellers who want a small, light system without sacrificing image quality
- Smartphone upgraders who want a proper camera that still fits in a bag
- Anyone who wants built-in selfie capability in a traditional camera body
A7R III (2017)
- Landscape and studio photographers who need 42MP resolution at a used-price discount vs A7R IV
- Canon/Nikon DSLR professionals considering a mirrorless switch at a lower investment
- Commercial and product photographers who want full-frame resolution with IBIS for handheld work
- Portrait photographers who want the sharpest possible full-frame files for large print work
Quick take: The a7r iii has the highest resolution at 42mp; the om-d e-m10 iv is the most affordable; only the a7r iii is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-D E-M10 IV (2020) | A7R III (2017) |
|---|---|---|
| Price | £469 | £1,799 |
| Sensor | 20.3MP Micro Four Thirds Live MOS | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 20.3MP | 42.4MP |
| Video | 4K/30p, 1080p/60p | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | Phase-detect + contrast detect, 121 points | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | 5-axis IBIS, 4.5 stops | 5-axis IBIS — 5.5 stops |
| Burst Rate | 15fps | 10fps with AF/AE tracking |
| Battery Life | ~360 shots (CIPA) | ~650 shots (CIPA) |
| Weight | 383g body only | 650g body only |
| Dimensions | 121.4 × 83.6 × 49.0mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | No | Yes |
| Viewfinder | EVF, 2.36M dots, 0.46× magnification | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.0" tilting touchscreen | 3.0" touchscreen, tilting |
| Mount | Micro Four Thirds | Sony FE mount (full-frame E-mount) |
| Memory Cards | Single SD UHS-I slot | Dual SD slots (one UHS-II) |
| Connectivity | USB Micro-B, Bluetooth, Wi-Fi, micro HDMI | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack |
Suitability by genre
| Genre | OM-D E-M10 IV | A7R III |
|---|---|---|
| Travel | — | |
| Street | ||
| Family & Everyday | — | |
| Portrait | ||
| Landscape | ||
| Sports & Action | — | |
| Vlogging & Video | — | |
| Wedding | — | |
| Sports | — |
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