OM System TG-7vs A7S
OM System
OM System TG-7 (2023)
Starting from £449 new
Best for Adventure, underwater & outdoor use
View OM System TG-7
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.
Astrophotography & Low-Light — A7S (2014): The original A7S pioneered the concept of a camera optimised entirely for low light. Its 12.2MP sensor has enormous photosites — extraordinary high-ISO performance that still holds up. Lacking IBIS and limited to 1080p internally (4K requires external recorder), it is a specialist tool. For astrophotography, event videography, or any scenario where light is genuinely scarce, it remains outstanding.
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 (2014)
- Astrophotographers
- Low-light event videographers
- Filmmakers needing clean high-ISO footage
Quick take: The a7s 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 (2014) |
|---|---|---|
| Price | £449 | £600 |
| Sensor | 12MP BSI CMOS | 12.2MP Full-Frame BSI CMOS |
| Resolution | 12.0MP | 12.2MP |
| Video | 4K/30p, 1080p/120p | 1080p/60p internal, 4K via HDMI (external recorder) |
| Autofocus | Hybrid phase/contrast AF | Phase-detect / contrast-detect hybrid AF |
| Stabilisation | Digital IS | None |
| Burst Rate | 20fps | 5fps |
| Battery Life | 340 shots (CIPA) | ~370 shots (CIPA) |
| Weight | 253g | 474g (with battery and card) |
| Dimensions | 113.0 × 66.5 × 32.7mm | 126.9 × 94.4 × 48.2mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | None | Electronic, 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 (full-frame E-mount) |
| Memory Cards | Single SD UHS-I | Single SD / MemoryStick PRO Duo slot |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Multi/Micro USB, Wi-Fi, NFC |
Suitability by genre
| Genre | OM System TG-7 | A7S |
|---|---|---|
| Adventure & Outdoor | — | |
| Underwater | — | |
| Travel | ||
| Family & Everyday | — | |
| Street | ||
| Portrait | ||
| Astrophotography | — | |
| Vlogging & Video | — | |
| Landscape | — | |
| Sports & Action | — |
GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →
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Camera family history