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Quick take: The A7R IV has the highest resolution at 61MP; the A7S II is the most affordable.
16 specs side by side·14 genres scored·UK prices from Wex Photo Video and Clifton Cameras
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A7R IV — Landscape, Studio, Commercial: 61MP in a mirrorless body — the resolution benchmark.
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.
| Specification | A7R IVSony · 2019 | A7S IISony · 2015 |
|---|---|---|
| Price | £2,199 | £799Best |
| Sensor | Full-frame BSI Exmor R CMOS 35mm | 12.1MP full-frame BSI Exmor CMOS |
| Resolution | 61.0MPBest | 12.1MP |
| Video | 4K 30fps | 4K/30p internal (full sensor readout), 1080p/120p, S-Log2/S-Log3 |
| Autofocus | 567-point phase-detect, real-time tracking | Contrast-detect AF, 169 points; limited by modern standards |
| Stabilisation | 5-axis IBIS, 5.5 stops | 5-axis IBIS — 4.5 stops (first Sony mirrorless with IBIS) |
| Burst Rate | 10fpsBest | 5fps continuous |
| Battery Life | 670 shots (CIPA)Best | ~370 shots (CIPA) |
| Weight | 665g (body only) | 584g (body only)Best |
| Dimensions | 128.9 × 96.4 × 77.5mm | 126.9 × 95.7 × 60.3mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.78× 5.76M-dot | EVF, 2.36M dots, 0.71× magnification |
| Screen | 3.0" tilting touchscreen, 1.44M-dot | 3.0" tilting LCD, 1.23M dots |
| Mount | Sony E-Mount | Sony FE mount (full-frame E-mount) |
| Memory Cards | Dual SD UHS-II slots | Dual SD UHS-I slots |
| Connectivity | Wi-Fi 5GHz, Bluetooth 4.1, USB-C 3.2 | 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.
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 →