Canon EOS R3vs OM System TG-7vs A7S III
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
OM System
OM System TG-7 (2023)
From £449
Best for Adventure, underwater & outdoor use
View OM System TG-7
Which should you buy?
Sports & Photojournalism Professionals — Canon EOS R3 (2021): The pinnacle of Canon's mirrorless lineup for speed — Eye Control AF and 30fps burst in the most rugged body Canon has ever produced.
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.
Professional Video & Low-Light Filmmaking — A7S III (2020): If video is your primary discipline, the A7S III is the camera. 4K/120p at 10-bit in a weather-sealed body with a 9.44M dot EVF is an extraordinary package. The 12MP sensor isn't limiting for video — and it's usable at ISO 409,600 in a pinch.
Who should buy what
Canon EOS R3 (2021)
- You shoot sport, motorsport, wildlife, or news at a professional level
- You need Canon's most reliable and fastest autofocus available
- You need extreme weather sealing for demanding shooting conditions
OM System TG-7 (2023)
- You dive, surf, kayak, ski, or hike and need a camera that genuinely survives anything
- You want a waterproof backup or travel camera that doesn't require a separate housing
- You need a rugged compact for adventure, outdoor, and underwater activities
A7S III (2020)
- Filmmakers and videographers who need 4K/120p at 10-bit
- Event videographers who shoot in dark venues regularly
- Documentary filmmakers who need reliable AF and weather sealing
- Hybrid shooters where video is primary and stills are secondary
Quick take: The canon eos r3 has the highest resolution at 24mp; the om system tg-7 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | OM System TG-7 (2023) | A7S III (2020) |
|---|---|---|---|
| Price | £5,999 | £449 | £2,999 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 12MP BSI CMOS | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) |
| Resolution | 24.1MP | 12.0MP | 12.1MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/30p, 1080p/120p | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | Hybrid phase/contrast AF | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition |
| Stabilisation | 8-stop IBIS | Digital IS | 5.5-stop IBIS |
| Burst Rate | 30fps electronic / 12fps mechanical | 20fps | 10fps mechanical |
| Battery Life | 620 shots (CIPA) | 340 shots (CIPA) | ~600 shots (CIPA) / ~70min continuous 4K recording |
| Weight | 1015g body only | 253g | 699g (body, battery, card) |
| Dimensions | 150.0 × 142.6 × 87.2mm | 113.0 × 66.5 × 32.7mm | 128.9 × 96.9 × 80.8mm |
| Weather Sealed | Yes | Yes | Yes |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | None | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made |
| Screen | 3.2" fully articulating touchscreen | 3.0" fixed TFT LCD | 3.0" vari-angle touchscreen, 1.44M dots |
| Mount | Canon RF | Fixed 25mm-equiv f/2.0 lens (4× optical zoom) | Sony E-mount |
| Memory Cards | Dual CFexpress Type B | Single SD UHS-I | Dual CFexpress Type A / SD UHS-II (both slots) |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | USB-C, Wi-Fi, Bluetooth | USB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth |
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