OM System TG-7vs A7R III
OM System
OM System TG-7 (2023)
Starting from £449 new
Best for Adventure, underwater & outdoor use
View OM System TG-7
VS
Sony
A7R III (2017)
Starting from £1799 new
Best for Landscape, studio & commercial photography
View A7R III
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.
Landscape, Studio & Commercial Photography — A7R III (2017): The camera that converted professionals to mirrorless — 42MP, IBIS, and 10fps in a body that still competes today.
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
A7R III (2017)
- Landscape and studio photographers who need 42MP resolution at a used-price discount vs A7R IV
- Canon/Nikon DSLR professionals considering a mirrorless switch at a lower investment
- Commercial and product photographers who want full-frame resolution with IBIS for handheld work
- Portrait photographers who want the sharpest possible full-frame files for large print work
Quick take: The a7r iii has the highest resolution at 42mp; the om system tg-7 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | OM System TG-7 (2023) | A7R III (2017) |
|---|---|---|
| Price | £449 | £1,799 |
| Sensor | 12MP BSI CMOS | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 12.0MP | 42.4MP |
| Video | 4K/30p, 1080p/120p | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | Hybrid phase/contrast AF | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | Digital IS | 5-axis IBIS — 5.5 stops |
| Burst Rate | 20fps | 10fps with AF/AE tracking |
| Battery Life | 340 shots (CIPA) | ~650 shots (CIPA) |
| Weight | 253g | 650g body only |
| Dimensions | 113.0 × 66.5 × 32.7mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | None | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.0" fixed TFT LCD | 3.0" touchscreen, tilting |
| 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 slots (one UHS-II) |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack |
Suitability by genre
| Genre | OM System TG-7 | A7R III |
|---|---|---|
| Adventure & Outdoor | — | |
| Underwater | — | |
| Travel | — | |
| Family & Everyday | — | |
| Street | ||
| Portrait | ||
| Landscape | — | |
| Vlogging & Video | — | |
| Wedding | — | |
| Sports | — |
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