OM System
OM-3 2025
Best for Travel, outdoor & adventure photography
£1599
new today at Clifton Cameras
Decision tools · Compare
OM-3 vs A7C
Quick take: The A7C has the highest resolution at 24MP; the OM-3 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.
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-3 — Travel, Outdoor & Adventure Photography: The ideal mid-range OM System camera — weather sealed, class-leading IBIS, and superb computational features in a compact body.
A7C — Compact Travel & Content Creation: The A7C proves full-frame doesn't have to be bulky. Excellent battery life, reliable Eye AF and a vari-angle screen in a pocketable body is a compelling combination for travel and content creators. The A7C II improved on it, but the original remains a strong value buy.
Who should buy what
OM-3 (2025)
is the right camera for you if…
- 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
A7C (2020)
is the right camera for you if…
- Travel photographers who want full-frame in the smallest possible body
- Content creators who need a flip screen and reliable Eye AF
- Photographers upgrading from APS-C who want to keep a compact kit
- Vloggers who need 4K and great battery life on the road
Full specificationsthe better value in each row is highlighted
| Specification | OM-3OM System · 2025 | A7CSony · 2020 |
|---|---|---|
| Price | £1,599Best | £1,699 |
| Sensor | 20.4MP Live MOS Micro Four Thirds | 24.2MP Full-Frame Exmor R BSI CMOS |
| Resolution | 20.4MP | 24.2MPBest |
| Video | 4K/60p (10-bit), C4K/30p, 1080p/120p | 4K/30p (oversampled), 1080p/120p slow-motion, S-Log2/S-Log3 |
| Autofocus | Phase-detect AF — subject recognition (human, animal, bird, vehicle) | Phase-detect, 693 points, real-time Eye AF & animal AF |
| Stabilisation | IBIS — up to 6.5 stops (7.5 stops with Sync IS lenses) | 5-axis IBIS, 5 stops |
| Burst Rate | 10fps mechanical, 30fps electronic with AF | 10fps with AF/AE tracking |
| Battery Life | ~400 shots (CIPA) | ~740 shots (CIPA) — outstanding for a Sony mirrorlessBest |
| Weight | 414g (with battery and card)Best | 509g (with battery and card) |
| Dimensions | 122.3 × 84.6 × 49.4mm | 124.0 × 71.1 × 59.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.74× magnification | None built-in — use rear screen or accessory EVF |
| Screen | 3.0" fully articulating touchscreen | 3.0" vari-angle touchscreen, 921k dots |
| Mount | Micro Four Thirds | Sony E-mount |
| Memory Cards | Single SD UHS-II slot | Single SD UHS-II |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C (USB 3.2 Gen 2), Wi-Fi, Bluetooth, 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-3
A7C
Portrait
7.3/10
7.5/10
Street
6.9/10
7.5/10
Travel
6.7/10
7.0/10
Wedding & Events
6.8/10
6.5/10
Vlogging & Video
6.5/10
5.7/10
Filmmaking
6.7/10
6.6/10
Documentary
7.9/10
7.0/10
Sports & Action
8.9/10
6.9/10
Landscape
6.2/10
6.5/10
Wildlife
9.0/10
7.6/10
Casual
5.8/10
5.4/10
Food
7.3/10
7.1/10
Macro
8.2/10
6.1/10
Architecture
6.3/10
6.3/10
Astrophotography
6.1/10
7.6/10
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 →
Next
More comparisons with OM-3
Camera family history