EOS R6 Mark IIIvs A7R III
Canon
EOS R6 Mark III (2025)
Starting from £2799 new
Best for Hybrid photo & video professionals, sports and wildlife shooters
View EOS R6 Mark III
Sony
A7R III (2017)
Starting from £1799 new
Best for Landscape, studio & commercial photography
View A7R III
GearScore™ Verdict — Which should you buy?
Hybrid Photo & Video Professionals, Sports And Wildlife Shooters — EOS R6 Mark III (2025): The EOS R6 Mark III takes everything that made the Mark II a hybrid favourite and pushes it further — a faster stacked sensor, smarter autofocus, and genuinely professional video specs. It's the most complete all-rounder in Canon's RF full-frame lineup, sitting just below the R5 II in resolution while matching it for speed.
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
EOS R6 Mark III (2025)
- Working photographers who need a single body for both stills and serious video work
- Sports and wildlife shooters who need 40fps burst shooting with reliable subject tracking
- Hybrid content creators producing 4K and 6K footage alongside high-resolution stills
- Enthusiasts upgrading from the EOS R6 Mark II who want faster AF and more resolution
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 a7r iii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS R6 Mark III (2025) | A7R III (2017) |
|---|---|---|
| Price | £2,799 | £1,799 |
| Sensor | 32.5MP full-frame stacked CMOS | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 32.5MP | 42.4MP |
| Video | 4K 60fps oversampled from 7K, 6K RAW internal | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | Dual Pixel CMOS AF II — deep-learning subject detection for people, animals and vehicles, up to 40fps tracking | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | In-body 5-axis IS, up to 8.5 stops | 5-axis IBIS — 5.5 stops |
| Burst Rate | 40fps (electronic shutter), 12fps (mechanical) | 10fps with AF/AE tracking |
| Battery Life | ~580 shots (CIPA, LP-E6P) | ~650 shots (CIPA) |
| Weight | 670g (body with battery and card) | 650g body only |
| Dimensions | 138.4 × 98.4 × 88.4mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF, 5.76M-dot, up to 120fps | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.2-inch vari-angle touchscreen, 2.1M-dot | 3.0" touchscreen, tilting |
| Mount | Canon RF | Sony FE mount (full-frame E-mount) |
| Memory Cards | Dual SD / SDHC / SDXC (UHS-II) | Dual SD slots (one UHS-II) |
| Connectivity | USB-C, Wi-Fi 6, Bluetooth 5.0, 2.5GbE | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack |
Suitability by genre
| Genre | EOS R6 Mark III | A7R III |
|---|---|---|
| Sports & Action | — | |
| Wildlife | — | |
| Vlogging & Video | ||
| Portrait | ||
| Landscape | ||
| Travel | — | |
| Street | ||
| Casual | — | |
| Wedding | — | |
| Sports | — |
GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →
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Camera family history