Canon EOS R3vs Olympus OM-D E-M5 IIIvs A6400
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
OM System
Olympus OM-D E-M5 III (2019)
From £699
Best for Travel & lightweight outdoor photography
View Olympus OM-D E-M5 III
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.
Travel & Lightweight Outdoor Photography — Olympus OM-D E-M5 III (2019): The lightest weather-sealed MFT camera — compact, travel-friendly, and capable with 7.5-stop IBIS in a body that fits in a jacket pocket.
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.
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
Olympus OM-D E-M5 III (2019)
- You want a lightweight, sealed camera for travel and outdoor photography
- You're new to Micro Four Thirds and want a capable mid-range body with excellent stabilisation
- Note: consider the newer OM-5 for updated specs in a similar compact form factor
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
Quick take: The a6400 has the highest resolution at 24mp; the olympus om-d e-m5 iii is the most affordable; only the canon eos r3, olympus om-d e-m5 iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | Olympus OM-D E-M5 III (2019) | A6400 (2019) |
|---|---|---|---|
| Price | £5,999 | £699 | £899 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 20.4MP Micro Four Thirds Live MOS | 24.2MP APS-C Exmor CMOS BSI |
| Resolution | 24.1MP | 20.4MP | 24.2MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/30p, 1080p/120p | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | Hybrid phase/contrast AF with face/eye detection | Phase-detect, 425 points, real-time Eye AF & animal AF |
| Stabilisation | 8-stop IBIS | 7.5-stop 5-axis IBIS | None (no IBIS) |
| Burst Rate | 30fps electronic / 12fps mechanical | 30fps electronic / 10fps mechanical | 11fps mechanical, 8fps with AF tracking |
| Battery Life | 620 shots (CIPA) | 390 shots (CIPA) | ~410 shots (CIPA) |
| Weight | 1015g body only | 414g body only | 403g (body, battery, card) |
| Dimensions | 150.0 × 142.6 × 87.2mm | 125.3 × 85.2 × 49.7mm | 120.0 × 66.9 × 59.7mm |
| Weather Sealed | Yes | Yes | No |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | 0.35" OLED EVF, 2.36M dots | EVF, 2.36M dots, 0.70× magnification |
| Screen | 3.2" fully articulating touchscreen | 3.0" fully articulating touchscreen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots |
| Mount | Canon RF | Micro Four Thirds | Sony E-mount |
| Memory Cards | Dual CFexpress Type B | Single SD UHS-I | Single SD UHS-I |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | Micro USB, Wi-Fi, Bluetooth | Micro-USB, Wi-Fi, Bluetooth, NFC |
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