EOS Rvs A7S III
Canon
EOS R (2018)
Starting from £799 new
Best for Entry to full-frame mirrorless & RF lens exploration
View EOS R
Sony
A7S III (2020)
Starting from £2999 new
Best for Professional video & low-light filmmaking
View A7S III
GearScore™ Verdict — Which should you buy?
Entry To Full-Frame Mirrorless & Rf Lens Exploration — EOS R (2018): The RF mount's founding camera — 30MP, Dual Pixel CMOS AF, and the proof-of-concept that launched Canon's mirrorless era.
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
EOS R (2018)
- Canon DSLR users wanting to enter the RF ecosystem at the lowest full-frame price
- EF lens collectors who want an affordable RF body to use with the EF-RF adapter
- Photographers stepping up from APS-C who want full-frame quality on a budget
- RF system fans who want a second body without full EOS R6 pricing
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 eos r has the highest resolution at 30mp; the eos r is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS R (2018) | A7S III (2020) |
|---|---|---|
| Price | £799 | £2,999 |
| Sensor | 30.3MP full-frame CMOS | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) |
| Resolution | 30.3MP | 12.1MP |
| Video | 4K/30p (1.7× crop), 1080p/60p | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p |
| Autofocus | Dual Pixel CMOS AF — 5655 AF areas, Eye AF | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition |
| Stabilisation | None | 5.5-stop IBIS |
| Burst Rate | 8fps continuous (5fps with AF/AE) | 10fps mechanical |
| Battery Life | ~350 shots (CIPA) | ~600 shots (CIPA) / ~70min continuous 4K recording |
| Weight | 660g body only | 699g (body, battery, card) |
| Dimensions | 135.8 × 98.3 × 84.4mm | 128.9 × 96.9 × 80.8mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 3.69M dots, 0.71× magnification | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made |
| Screen | 3.0" touchscreen, tilting | 3.0" vari-angle touchscreen, 1.44M dots |
| Mount | Canon RF mount (full-frame) | Sony E-mount |
| Memory Cards | Single SD UHS-II slot | Dual CFexpress Type A / SD UHS-II (both slots) |
| Connectivity | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack | USB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth |
Suitability by genre
| Genre | EOS R | A7S III |
|---|---|---|
| Portrait | ||
| Landscape | — | |
| Travel | ||
| Wedding | — | |
| Vlogging & Video | — | |
| Sports | — | |
| Video | — | |
| Wildlife | — | |
| Street | — |
More comparisons with EOS R
Camera family history