OM System
OM-1 Mark II 2024
Best for Wildlife, birds & outdoor sports
£2049
new today at Clifton Cameras
Decision tools · Compare
OM-1 Mark II vs A7R III
Quick take: The A7R III has the highest resolution at 42MP; the A7R III is the most affordable.
16 specs side by side·15 genres scored·UK prices from Wex Photo Video and Clifton Cameras
How to read this page. Highlighted cells win that row on the spec alone. Genre scores are the engine's base scores (enthusiast, photo and video); Camera Match re-weights them for your level and priorities. Price buttons are affiliate links; the price you pay is the same.
Sony
A7R III 2017
Best for Landscape, studio & commercial photography
£1799
list price · used from £668 at Wex Photo Video
Price buttons are affiliate links — GearFrame may earn a commission at no extra cost to you. It never affects a score. Learn more
Verdictwhich should you buy?
OM-1 Mark II — Wildlife, Birds & Outdoor Sports: OM System's most capable camera — 120fps AF burst, AI subject detection, and IP53 weather sealing make it the best-value pro wildlife camera.
A7R III — Landscape, Studio & Commercial Photography: The camera that converted professionals to mirrorless — 42MP, IBIS, and 10fps in a body that still competes today.
Who should buy what
OM-1 Mark II (2024)
is the right camera for you if…
- 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 III (2017)
is the right camera for you if…
- 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
Full specificationsthe better value in each row is highlighted
| Specification | OM-1 Mark IIOM System · 2024 | A7R IIISony · 2017 |
|---|---|---|
| Price | £2,049 | £1,799Best |
| Sensor | 20MP Micro Four Thirds Live MOS | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 20.0MP | 42.4MPBest |
| Video | 4K/60p, 1080p/240p, 4K HLG | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | AI subject detection AF (birds, animals, motorsport) | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | 8.5-stop IBIS | 5-axis IBIS — 5.5 stops |
| Burst Rate | 120fps with AF trackingBest | 10fps with AF/AE tracking |
| Battery Life | 520 shots (CIPA) | ~650 shots (CIPA)Best |
| Weight | 599g (body only)Best | 650g (body only) |
| Dimensions | 134.8 × 91.6 × 72.7mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | 0.83" OLED EVF, 5.76M dots, 120fps | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.0" touchscreen, tilting |
| Mount | Micro Four Thirds | Sony FE mount (full-frame E-mount) |
| Memory Cards | Dual SD UHS-II | Dual SD slots (one UHS-II) |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack |
Wins the row — price, resolution, burst, battery, weight and sealing are compared; text specs aren't ranked.
How they score by genreengine base scores out of 10
Genre
OM-1 Mark II
A7R III
Portrait
7.6/10
7.8/10
Street
6.6/10
6.1/10
Travel
6.4/10
6.1/10
Wedding & Events
7.9/10
7.5/10
Vlogging & Video
6.2/10
—
Filmmaking
6.8/10
6.3/10
Documentary
7.9/10
6.7/10
Sports & Action
9.3/10
7.3/10
Landscape
6.1/10
7.4/10
Wildlife
9.1/10
7.6/10
Casual
5.5/10
4.7/10
Food
7.4/10
7.0/10
Macro
8.4/10
6.2/10
Architecture
6.3/10
7.5/10
Astrophotography
6.0/10
7.0/10
Scores come from the same engine as Camera Match: verified specifications weighted by what each genre needs, with documented adjustments. The product page and this table show the enthusiast base score. See how scores are calculated →
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