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OM System TG-7vs A7S

GearFrame · Updated March 2026

OM System OM System TG-7 OM System OM System TG-7 (2023) Starting from £449 new Best for Adventure, underwater & outdoor use View OM System TG-7
VS
Sony A7S Sony A7S (2014) Starting from £600 new Best for Astrophotography & Low-Light View A7S

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.

↓ Full specifications below

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
Genre OM System TG-7A7S
Adventure & Outdoor
9.0
Underwater
9.0
Travel
9.0
7.0
Family & Everyday
7.0
Street
4.0
7.0
Portrait
4.0
7.0
Astrophotography
9.5
Vlogging & Video
7.5
Landscape
6.0
Sports & Action
5.0

GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →

⚡ Compare specs side by side OM System TG-7 prices → A7S prices →

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