OM-3vs A7 IV
OM System
OM-3 (2024)
Starting from £999 new
Best for Travel, outdoor & adventure photography
View OM-3
VS
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 & Wedding Photography — A7 IV (2021): The full-frame portrait benchmark — 33MP, AI Eye AF, and exceptional skin-tone rendering in a pro-grade hybrid body.
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
A7 IV (2021)
- Working photographers who want a reliable full-frame all-rounder
- Portrait, wedding, and event photographers needing 33MP and fast AF
- A7 III owners ready for a major upgrade in resolution, AF, and video
- Hybrid shooters who want 4K/60p and 33MP stills in one dependable body
Quick take: The a7 iv has the highest resolution at 33mp; the om-3 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-3 (2024) | A7 IV (2021) |
|---|---|---|
| Price | £999 | £2,299 |
| Sensor | 20.4MP Live MOS Micro Four Thirds | 33MP Full-frame BSI Exmor R CMOS |
| Resolution | 20.4MP | 33.0MP |
| Video | 4K/60p (10-bit), C4K/30p, 1080p/120p | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone |
| Autofocus | Phase-detect AF — subject recognition (human, animal, bird, vehicle) | 759-point phase-detect, AI subject recognition |
| Stabilisation | IBIS — up to 6.5 stops (7.5 stops with Sync IS lenses) | 5-axis IBIS, 5.5 stops |
| Burst Rate | 10fps mechanical, 30fps electronic with AF | 10fps mechanical, 30fps electronic |
| Battery Life | ~400 shots (CIPA) | ~580 shots (CIPA) |
| Weight | 414g (with battery) | 659g body only |
| Dimensions | 122.3 × 84.6 × 49.4mm | 131.3 × 96.4 × 79.8mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.74× magnification | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.0" vari-angle touchscreen |
| Mount | Micro Four Thirds | Sony FE (full-frame E-mount) |
| Memory Cards | Single SD UHS-II slot | Dual slots: CFexpress Type A + SD UHS-II |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi |
Suitability by genre
| Genre | OM-3 | A7 IV |
|---|---|---|
| Travel | — | |
| Wildlife | — | |
| Landscape | ||
| Street | — | |
| Portrait | — | |
| Vlogging & Video | ||
| Studio Portraits | — | |
| Outdoor Portraits | — | |
| Wedding & Events | — | |
| Sports & Action | — |
More comparisons with OM-3
Camera family history