Canon EOS R3vs Sigma fpvs Sony A9 III
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
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.
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.
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
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
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
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 sigma fp has the highest resolution at 25mp; the sigma fp is the most affordable; only the canon eos r3, sony a9 iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | Sigma fp (2019) | Sony A9 III (2023) |
|---|---|---|---|
| Price | £5,999 | £1,499 | £5,999 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 24.6MP full-frame Bayer CMOS | 24.6MP full-frame Exmor RS CMOS (global shutter) |
| Resolution | 24.1MP | 24.6MP | 24.6MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 12-bit Cinema DNG RAW, 4K/24p, 1080p/120p | 4K/120p, 4K/60p, 1080p/240p |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | Contrast-detect AF with face/eye detection | AI subject recognition AF, 759-point phase-detect |
| Stabilisation | 8-stop IBIS | None (lens-based only) | 8-stop IBIS |
| Burst Rate | 30fps electronic / 12fps mechanical | 18fps electronic | 120fps blackout-free electronic |
| Battery Life | 620 shots (CIPA) | 200 shots (CIPA) | 530 shots (CIPA) |
| Weight | 1015g body only | 422g body only | 703g body only |
| Dimensions | 150.0 × 142.6 × 87.2mm | 112.6 × 69.9 × 45.3mm | 136.1 × 96.9 × 82.9mm |
| Weather Sealed | Yes | No | Yes |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | None | 0.64" Quad-XGA OLED EVF, 9.44M dots |
| Screen | 3.2" fully articulating touchscreen | 3.15" fixed touchscreen | 3.2" fully articulating touchscreen |
| Mount | Canon RF | Leica L-mount | Sony FE (E-mount) |
| Memory Cards | Dual CFexpress Type B | Single SD UHS-II + CFexpress Type B (via adapter) | Dual CFexpress Type A / SD UHS-II |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | USB-C 3.1, Wi-Fi, Bluetooth | USB-C 3.2, HDMI A, Wi-Fi 6, Bluetooth 5.3 |
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