Canon EOS R3vs OM-D E-M10 IVvs A7 IV
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
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 & Everyday — OM-D E-M10 IV (2020): Compact Micro Four Thirds body with built-in IBIS — ideal for travellers who want stability without bulk.
Portrait & Wedding Photography — A7 IV (2021): The full-frame portrait benchmark — 33MP, AI Eye AF, and exceptional skin-tone rendering in a pro-grade hybrid body.
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-D E-M10 IV (2020)
- You're new to mirrorless and want a small, uncomplicated first camera to learn on
- You want excellent in-body stabilisation to steady handheld video and shake-prone shooting
- You're drawn to the Micro Four Thirds ecosystem and want to start at the entry level
A7 IV (2021)
- You want a high-resolution full-frame all-rounder for portraits, weddings, or travel
- You're stepping up from APS-C or a DSLR and want the best all-round full-frame body under £3,000
- You shoot a mix of stills and video and need a single body that handles both seriously
- You want access to the widest lens ecosystem in the mirrorless market
Quick take: The a7 iv has the highest resolution at 33mp; the om-d e-m10 iv is the most affordable; only the canon eos r3, a7 iv are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | OM-D E-M10 IV (2020) | A7 IV (2021) |
|---|---|---|---|
| Price | £5,999 | £469 | £2,299 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 20.3MP Micro Four Thirds Live MOS | 33MP Full-frame BSI Exmor R CMOS |
| Resolution | 24.1MP | 20.3MP | 33.0MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/30p, 1080p/60p | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | Phase-detect + contrast detect, 121 points | 759-point phase-detect, AI subject recognition |
| Stabilisation | 8-stop IBIS | 5-axis IBIS, 4.5 stops | 5-axis IBIS, 5.5 stops |
| Burst Rate | 30fps electronic / 12fps mechanical | 15fps | 10fps mechanical, 30fps electronic |
| Battery Life | 620 shots (CIPA) | ~360 shots (CIPA) | ~580 shots (CIPA) |
| Weight | 1015g body only | 383g body only | 659g body only |
| Dimensions | 150.0 × 142.6 × 87.2mm | 121.4 × 83.6 × 49.0mm | 131.3 × 96.4 × 79.8mm |
| Weather Sealed | Yes | No | Yes |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | EVF, 2.36M dots, 0.46× magnification | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.2" fully articulating touchscreen | 3.0" tilting touchscreen | 3.0" vari-angle touchscreen |
| Mount | Canon RF | Micro Four Thirds | Sony FE (full-frame E-mount) |
| Memory Cards | Dual CFexpress Type B | Single SD UHS-I slot | Dual slots: CFexpress Type A + SD UHS-II |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | USB Micro-B, Bluetooth, Wi-Fi, micro HDMI | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi |
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