EOS R8vs A6400vs Sony A9 III
Which should you buy?
Full-Frame Entry — EOS R8 (2023): Canon's most affordable full-frame mirrorless — 4K/60p 10-bit and class-leading Dual Pixel AF at an accessible entry price.
Content Creation & Vlogging — A6400 (2019): The best value APS-C Sony you can buy — especially used. Real-time Eye AF at this price point was transformative when it launched and still makes it one of the most reliable autofocus systems in the lineup.
Sports & Action Professionals — Sony A9 III (2023): A paradigm-shifting camera — the global shutter eliminates every rolling shutter limitation that has constrained action photography for years.
Who should buy what
EOS R8 (2023)
- You want full-frame image quality on a tight budget
- You shoot mainly in good light and can live without built-in stabilisation
- You primarily shoot stills with occasional video
A6400 (2019)
- Vloggers and content creators who need a flip screen and reliable AF
- Photographers upgrading from a compact or smartphone
- Beginners who want room to grow into a full E-mount lens ecosystem
- Anyone prioritising autofocus performance at an accessible price
Sony A9 III (2023)
- You shoot professional sport, motorsport, or action and need zero rolling shutter distortion
- You need reliable high-speed flash sync for studio or on-location action work
- You want the absolute pinnacle of Sony's action and sports camera technology
Quick take: The sony a9 iii has the highest resolution at 25mp; the a6400 is the most affordable; only the sony a9 iii is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS R8 (2023) | A6400 (2019) | Sony A9 III (2023) |
|---|---|---|---|
| Price | £1,099 | £899 | £5,999 |
| Sensor | 24.2MP Full-frame BSI CMOS | 24.2MP APS-C Exmor CMOS BSI | 24.6MP full-frame Exmor RS CMOS (global shutter) |
| Resolution | 24.2MP | 24.2MP | 24.6MP |
| Video | 4K/60p oversampled 10-bit, FHD/180p | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion | 4K/120p, 4K/60p, 1080p/240p |
| Autofocus | Dual Pixel CMOS AF II, 1053 zones, eye/face/subject tracking | Phase-detect, 425 points, real-time Eye AF & animal AF | AI subject recognition AF, 759-point phase-detect |
| Stabilisation | None (no IBIS) | None (no IBIS) | 8-stop IBIS |
| Burst Rate | 6fps mechanical, 40fps electronic | 11fps mechanical, 8fps with AF tracking | 120fps blackout-free electronic |
| Battery Life | ~220 shots (CIPA) | ~410 shots (CIPA) | 530 shots (CIPA) |
| Weight | 461g body only | 403g (body, battery, card) | 703g body only |
| Dimensions | 132.5 × 86.1 × 70.0mm | 120.0 × 66.9 × 59.7mm | 136.1 × 96.9 × 82.9mm |
| Weather Sealed | No | No | Yes |
| Viewfinder | EVF, 2.36M dots, 0.59× | EVF, 2.36M dots, 0.70× magnification | 0.64" Quad-XGA OLED EVF, 9.44M dots |
| Screen | 3.0" fully articulating touchscreen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots | 3.2" fully articulating touchscreen |
| Mount | Canon RF mount (full-frame) | Sony E-mount | Sony FE (E-mount) |
| Memory Cards | Single SD UHS-II slot | Single SD UHS-I | Dual CFexpress Type A / SD UHS-II |
| Connectivity | USB-C, Bluetooth, Wi-Fi | Micro-USB, Wi-Fi, Bluetooth, NFC | USB-C 3.2, HDMI A, Wi-Fi 6, Bluetooth 5.3 |
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