Canon EOS R3vs OM System OM-1 Mark IIvs A6400
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
OM System
OM System OM-1 Mark II (2024)
From £1999
Best for Wildlife, birds & outdoor sports
View OM System OM-1 Mark II
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.
Wildlife, Birds & Outdoor Sports — OM System OM-1 Mark II (2024): OM System's most capable camera — 120fps AF burst, AI subject detection, and IP53 weather sealing make it the best-value pro wildlife camera.
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
OM System OM-1 Mark II (2024)
- You shoot wildlife, birds in flight, or fast-moving action where tracking accuracy is critical
- You need extreme weather sealing for shooting in rain, dust, mud, or freezing cold
- You're invested in the MFT ecosystem and want the absolute best body available
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 a6400 is the most affordable; only the canon eos r3, om system om-1 mark ii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | OM System OM-1 Mark II (2024) | A6400 (2019) |
|---|---|---|---|
| Price | £5,999 | £1,999 | £899 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 20MP Micro Four Thirds Live MOS | 24.2MP APS-C Exmor CMOS BSI |
| Resolution | 24.1MP | 20.0MP | 24.2MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/60p, 1080p/240p, 4K HLG | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | AI subject detection AF (birds, animals, motorsport) | Phase-detect, 425 points, real-time Eye AF & animal AF |
| Stabilisation | 8-stop IBIS | 8.5-stop IBIS | None (no IBIS) |
| Burst Rate | 30fps electronic / 12fps mechanical | 120fps with AF tracking | 11fps mechanical, 8fps with AF tracking |
| Battery Life | 620 shots (CIPA) | 520 shots (CIPA) | ~410 shots (CIPA) |
| Weight | 1015g body only | 599g body only | 403g (body, battery, card) |
| Dimensions | 150.0 × 142.6 × 87.2mm | 134.8 × 91.6 × 72.7mm | 120.0 × 66.9 × 59.7mm |
| Weather Sealed | Yes | Yes | No |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | 0.83" OLED EVF, 5.76M dots, 120fps | 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 | Dual SD UHS-II | Single SD UHS-I |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | USB-C, Wi-Fi, Bluetooth | Micro-USB, Wi-Fi, Bluetooth, NFC |
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