Canon EOS R3vs Olympus OM-D E-M5 IIIvs Sigma fp
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
Sigma
Sigma fp (2019)
From £1499
Best for Creative filmmakers & experimental photographers
View Sigma fp
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.
Creative Filmmakers & Experimental Photographers — Sigma fp (2019): The smallest full-frame camera in the world — Cinema DNG RAW and L-mount flexibility in a pocket-sized body that rewards creative shooters.
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
Sigma fp (2019)
- You're a filmmaker building a cinema rig where the smallest full-frame body is essential
- You want L-mount compatibility to pair with Sigma Art or Leica SL lenses
- You prioritise video and cinema colour over stills ergonomics and functionality
Quick take: The sigma fp has the highest resolution at 25mp; 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) | Sigma fp (2019) |
|---|---|---|---|
| Price | £5,999 | £699 | £1,499 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 20.4MP Micro Four Thirds Live MOS | 24.6MP full-frame Bayer CMOS |
| Resolution | 24.1MP | 20.4MP | 24.6MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/30p, 1080p/120p | 12-bit Cinema DNG RAW, 4K/24p, 1080p/120p |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | Hybrid phase/contrast AF with face/eye detection | Contrast-detect AF with face/eye detection |
| Stabilisation | 8-stop IBIS | 7.5-stop 5-axis IBIS | None (lens-based only) |
| Burst Rate | 30fps electronic / 12fps mechanical | 30fps electronic / 10fps mechanical | 18fps electronic |
| Battery Life | 620 shots (CIPA) | 390 shots (CIPA) | 200 shots (CIPA) |
| Weight | 1015g body only | 414g body only | 422g body only |
| Dimensions | 150.0 × 142.6 × 87.2mm | 125.3 × 85.2 × 49.7mm | 112.6 × 69.9 × 45.3mm |
| Weather Sealed | Yes | Yes | No |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | 0.35" OLED EVF, 2.36M dots | None |
| Screen | 3.2" fully articulating touchscreen | 3.0" fully articulating touchscreen | 3.15" fixed touchscreen |
| Mount | Canon RF | Micro Four Thirds | Leica L-mount |
| Memory Cards | Dual CFexpress Type B | Single SD UHS-I | Single SD UHS-II + CFexpress Type B (via adapter) |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | Micro USB, Wi-Fi, Bluetooth | USB-C 3.1, Wi-Fi, Bluetooth |
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