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 A5100
Quick take: The A5100 has the highest resolution at 24MP; the A5100 is the most affordable; only the OM-1 Mark II is weather sealed.
16 specs side by side·16 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.
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.
A5100 — Casual & Travel: The A5100 is one of the smallest APS-C mirrorless cameras ever made. Its 24MP sensor, phase-detect AF, and selfie-friendly flip screen pack remarkable capability into a shirt-pocket-sized body. No EVF or hot shoe limits it for serious use, but as a compact travel camera or beginner's first mirrorless, it punches well above its price on the used market.
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
A5100 (2014)
is the right camera for you if…
- Beginners stepping up from a smartphone
- Compact travel photographers
- Casual vloggers who want APS-C quality
Full specificationsthe better value in each row is highlighted
| Specification | OM-1 Mark IIOM System · 2024 | A5100Sony · 2014 |
|---|---|---|
| Price | £2,049 | £102 usedBest |
| Sensor | 20MP Micro Four Thirds Live MOS | 24.3MP APS-C Exmor CMOS |
| Resolution | 20.0MP | 24.3MPBest |
| Video | 4K/60p, 1080p/240p, 4K HLG | 1080p/60p |
| Autofocus | AI subject detection AF (birds, animals, motorsport) | Hybrid phase-detect / contrast-detect AF, face detection |
| Stabilisation | 8.5-stop IBIS | No stabilisation |
| Burst Rate | 120fps with AF trackingBest | 6fps |
| Battery Life | 520 shots (CIPA)Best | ~400 shots (CIPA) |
| Weight | 599g (body only) | 224g (body only)Best |
| Dimensions | 134.8 × 91.6 × 72.7mm | 109.6 × 62.8 × 35.7mm |
| Weather Sealed | YesBest | Not weather sealed |
| Viewfinder | 0.83" OLED EVF, 5.76M dots, 120fps | No viewfinder |
| Screen | 3.0" fully articulating touchscreen | 3.0" flip-up touchscreen, 921k dots |
| Mount | Micro Four Thirds | Sony E-mount |
| Memory Cards | Dual SD UHS-II | Single SD / MemoryStick PRO Duo slot |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Micro USB, Wi-Fi, NFC |
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
A5100
Portrait
7.6/10
5.4/10
Street
6.6/10
7.0/10
Travel
6.4/10
6.4/10
Wedding & Events
7.9/10
3.5/10
Vlogging & Video
6.2/10
4.7/10
Filmmaking
6.8/10
—
Documentary
7.9/10
4.1/10
Sports & Action
9.3/10
4.7/10
Landscape
6.1/10
5.0/10
Wildlife
9.1/10
5.5/10
Casual
5.5/10
5.2/10
Food
7.4/10
5.9/10
Macro
8.4/10
5.2/10
Architecture
6.3/10
5.2/10
Astrophotography
6.0/10
4.7/10
Fun & simple
—
4.9/10
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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