Canon EOS R3vs A7C IIvs A7S III
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
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.
Full-Frame Hybrid — A7C II (2023): Full-frame AI autofocus in the most compact body available — the best camera under £1,500 for hybrid shooters.
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
A7C II (2023)
- You want full-frame image quality in the most compact body possible
- You travel constantly and need a serious camera that doesn't weigh down your bag
- You're a portrait or lifestyle photographer who shoots on the move
- You create content for social media or YouTube and want full-frame quality in a vlog-friendly form
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 a7c ii has the highest resolution at 33mp; the a7c ii is the most affordable; only the canon eos r3, a7s iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | A7C II (2023) | A7S III (2020) |
|---|---|---|---|
| Price | £5,999 | £1,499 | £2,999 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 33MP Full-frame Exmor R BSI CMOS | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) |
| Resolution | 24.1MP | 33.0MP | 12.1MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/60p oversampled, S-Log3, 10-bit internal | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | 759-point phase-detect, AI subject recognition | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition |
| Stabilisation | 8-stop IBIS | 5-axis IBIS, 7.0 stops | 5.5-stop IBIS |
| Burst Rate | 30fps electronic / 12fps mechanical | 10fps mechanical, 30fps electronic | 10fps mechanical |
| Battery Life | 620 shots (CIPA) | ~530 shots (CIPA) | ~600 shots (CIPA) / ~70min continuous 4K recording |
| Weight | 1015g body only | 514g body only | 699g (body, battery, card) |
| Dimensions | 150.0 × 142.6 × 87.2mm | 124.0 × 71.1 × 63.4mm | 128.9 × 96.9 × 80.8mm |
| Weather Sealed | Yes | No | Yes |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | EVF, 2.36M dots, 0.70× magnification | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made |
| Screen | 3.2" fully articulating touchscreen | 3.0" vari-angle touchscreen | 3.0" vari-angle touchscreen, 1.44M dots |
| Mount | Canon RF | Sony FE (full-frame E-mount) | Sony E-mount |
| Memory Cards | Dual CFexpress Type B | Dual slots: SD UHS-II + CFexpress Type A | Dual CFexpress Type A / SD UHS-II (both slots) |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | USB-C (3.2), Bluetooth, Wi-Fi | USB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth |
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