Decision tools · Compare
OM-5 Mark II vs A7S II
Quick take: The OM-5 Mark II has the highest resolution at 20MP; the A7S II 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
A7S II 2015
Best for Low-light video, documentary & available-light filmmaking
£799
list price · used from £400 at eBay
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Verdictwhich should you buy?
A7S II — Low-Light Video, Documentary & Available-Light Filmmaking: 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
A7S II (2015)
is the right camera for you if…
- 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
Full specificationsthe better value in each row is highlighted
| Specification | OM-5 Mark IIOM System · 2025 | A7S IISony · 2015 |
|---|---|---|
| Price | £880 | £799Best |
| Sensor | 20.4MP Four Thirds Live MOS | 12.1MP full-frame BSI Exmor CMOS |
| Resolution | 20.4MPBest | 12.1MP |
| Video | 4K/30p, OM-Log400 | 4K/30p internal (full sensor readout), 1080p/120p, S-Log2/S-Log3 |
| Autofocus | Phase-hybrid AF (121 cross-type points) | Contrast-detect AF, 169 points; limited by modern standards |
| Stabilisation | Up to 7.5-stop Sync IS (6.5-stop body-only) | 5-axis IBIS — 4.5 stops (first Sony mirrorless with IBIS) |
| Burst Rate | 10fps (AF tracking), 30fps (locked)Best | 5fps continuous |
| Battery Life | 310 shots (CIPA) | ~370 shots (CIPA)Best |
| Weight | 370g (body only)Best | 584g (body only) |
| Dimensions | — | 126.9 × 95.7 × 60.3mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 1.37x magnification | EVF, 2.36M dots, 0.71× magnification |
| Screen | Fully articulating touchscreen | 3.0" tilting LCD, 1.23M dots |
| Mount | Micro Four Thirds | Sony FE mount (full-frame E-mount) |
| Memory Cards | Single SD (UHS-II) | Dual SD UHS-I slots |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB Micro-B, Bluetooth (via app), 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-5 Mark II
A7S II
Portrait
6.5/10
5.8/10
Street
6.9/10
5.3/10
Travel
6.9/10
5.4/10
Wedding & Events
5.4/10
5.6/10
Vlogging & Video
6.5/10
—
Filmmaking
5.1/10
6.2/10
Documentary
6.3/10
5.8/10
Sports & Action
6.7/10
5.2/10
Landscape
6.0/10
5.0/10
Wildlife
7.4/10
5.6/10
Casual
6.1/10
3.5/10
Food
6.9/10
5.2/10
Macro
8.1/10
4.8/10
Architecture
6.0/10
4.8/10
Astrophotography
5.5/10
6.8/10
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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