OM-1vs A7S II
VS
Sony
A7S II (2015)
Starting from £799 new
Best for Low-light video, documentary & available-light filmmaking
View A7S II
GearScore™ Verdict — Which should you buy?
Wildlife, Sport, Outdoor — OM-1 (2022): OM System's statement camera — class-leading weather sealing and the best IBIS in the business.
Low-Light Video, Documentary & Available-Light Filmmaking — A7S II (2015): A landmark in mirrorless history — the first Sony with IBIS and internal 4K, its low-light video capability still impresses today at a used-market price.
Who should buy what
OM-1 (2022)
- Wildlife and bird photographers who need fast burst and pro weather sealing
- Outdoor photographers who work in challenging conditions
A7S II (2015)
- Filmmakers and videographers who want legendary low-light performance at a used-price discount
- Documentary shooters working in unpredictable available light conditions
- A7S III shooters who want a second Sony FE body for backup or B-camera use
- Budget-conscious video producers who want full-frame 4K with S-Log at an accessible price
Quick take: The om-1 has the highest resolution at 20mp; the a7s ii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM-1 (2022) | A7S II (2015) |
|---|---|---|
| Price | £1,299 | £799 |
| Sensor | Micro Four Thirds Live MOS stacked BSI | 12.1MP full-frame BSI Exmor CMOS |
| Resolution | 20.4MP | 12.1MP |
| Video | 4K 60fps 10-bit | 4K/30p internal (full sensor readout), 1080p/120p, S-Log2/S-Log3 |
| Autofocus | 1053-point cross-type phase-detect, AI subject recognition | 169 phase-detect + 25 contrast AF — limited by modern standards |
| Stabilisation | 5-axis IBIS, 7.0 stops (8 stops with sync IS) | 5-axis IBIS — 4.5 stops (first Sony mirrorless with IBIS) |
| Burst Rate | 10fps mechanical, 50fps electronic, 120fps Pro Capture | 5fps continuous |
| Battery Life | 520 shots (CIPA) | ~370 shots (CIPA) |
| Weight | 599g (body only) | 584g body only |
| Dimensions | 134.8 × 91.6 × 72.7mm | 126.9 × 95.7 × 60.3mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.83× 5.76M-dot | EVF, 2.36M dots, 0.71× magnification |
| Screen | 3.0" fully articulating touchscreen, 1.62M-dot | 3.0" tilting LCD, 1.23M dots |
| Mount | Micro Four Thirds | Sony FE mount (full-frame E-mount) |
| Memory Cards | 2× SD UHS-II / CFexpress Type B | Dual SD UHS-I slots |
| Connectivity | Wi-Fi 5GHz, Bluetooth 5.0, USB-C 3.1, HDMI, 3.5mm mic/headphone | USB Micro-B, Bluetooth (via app), Wi-Fi, 3.5mm mic jack |
Suitability by genre
| Genre | OM-1 | A7S II |
|---|---|---|
| Vlogging & Video | — | |
| Low Light | — | |
| Wedding | — | |
| Portrait | — | |
| Street | — | |
| Sports | — |
More comparisons with OM-1
Camera family history