OM System TG-7vs A7S II
OM System
OM System TG-7 (2023)
Starting from £449 new
Best for Adventure, underwater & outdoor use
View OM System TG-7
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?
Adventure, Underwater & Outdoor Use — OM System TG-7 (2023): Waterproof to 15m, freezeproof and shockproof — the TG-7 is the most capable rugged compact for adventure and outdoor use.
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 System TG-7 (2023)
- Divers and snorkellers who need a waterproof camera without a housing
- Outdoor and adventure photographers who want a rugged pocket compact
- Parents who want an indestructible camera for children and family adventures
- Travellers who want a tough backup camera that can go anywhere
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 a7s ii has the highest resolution at 12mp; the om system tg-7 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM System TG-7 (2023) | A7S II (2015) |
|---|---|---|
| Price | £449 | £799 |
| Sensor | 12MP BSI CMOS | 12.1MP full-frame BSI Exmor CMOS |
| Resolution | 12.0MP | 12.1MP |
| Video | 4K/30p, 1080p/120p | 4K/30p internal (full sensor readout), 1080p/120p, S-Log2/S-Log3 |
| Autofocus | Hybrid phase/contrast AF | 169 phase-detect + 25 contrast AF — limited by modern standards |
| Stabilisation | Digital IS | 5-axis IBIS — 4.5 stops (first Sony mirrorless with IBIS) |
| Burst Rate | 20fps | 5fps continuous |
| Battery Life | 340 shots (CIPA) | ~370 shots (CIPA) |
| Weight | 253g | 584g body only |
| Dimensions | 113.0 × 66.5 × 32.7mm | 126.9 × 95.7 × 60.3mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | None | EVF, 2.36M dots, 0.71× magnification |
| Screen | 3.0" fixed TFT LCD | 3.0" tilting LCD, 1.23M dots |
| Mount | Fixed 25mm-equiv f/2.0 lens (4× optical zoom) | Sony FE mount (full-frame E-mount) |
| Memory Cards | Single SD UHS-I | Dual SD UHS-I slots |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB Micro-B, Bluetooth (via app), Wi-Fi, 3.5mm mic jack |
Suitability by genre
| Genre | OM System TG-7 | A7S II |
|---|---|---|
| Adventure & Outdoor | — | |
| Underwater | — | |
| Travel | — | |
| Family & Everyday | — | |
| Street | ||
| Portrait | ||
| Vlogging & Video | — | |
| Low Light | — | |
| Wedding | — | |
| Sports | — |
More comparisons with OM System TG-7
Camera family history