EOS-1D X Mark IIIvs EOS Mvs EOS R100

GearFrame · Updated March 2026

Canon EOS-1D X Mark III (2020) Starting from £3500 new Best for Professional Sports, Wildlife & Press Photography View EOS-1D X Mark III

Canon EOS M (2012) Starting from £80 new Best for Canon mirrorless history & EF-M collectors View EOS M

Canon EOS R100 (2023) Starting from £529 new Best for First camera / beginner photography View EOS R100

GearScore™ Verdict — Which should you buy?

Professional Sports, Wildlife & Press Photography — EOS-1D X Mark III (2020): Canon's DSLR masterpiece — 20fps live view, 5.5K RAW, 191 cross-type AF points, and dual CFexpress. Almost certainly the finest optical viewfinder camera ever made.

Canon Mirrorless History & Ef-M Collectors — EOS M (2012): Canon's first mirrorless — a historic body that broke new ground with touch-AF and EF-M, but its sluggish contrast-detect system quickly became its Achilles heel.

First Camera / Beginner Photography — EOS R100 (2023): The R100 does the basics well at the lowest possible price point. Its main value is as a gateway into the Canon RF ecosystem — the lenses you buy now will work on any Canon body you upgrade to later. Modest ambitions, reliably met.

↓ Full specifications below

Who should buy what

EOS-1D X Mark III (2020)

Sports and wildlife photographers with a Canon EF lens collection
Professionals who prefer the optical viewfinder experience
Press photographers who need 20fps, weather sealing, and Ethernet
Canon historians who want to mark the end of the EOS-1D DSLR era

EOS M (2012)

Canon shooters who want the camera that started Canon's mirrorless story
Budget first-time mirrorless buyers who already own EF/EF-S glass
Collectors of significant digital camera milestones

EOS R100 (2023)

First-time camera buyers stepping up from a smartphone
Students and hobbyists wanting an affordable starting point
Anyone who wants to start investing in Canon RF glass on a budget
Casual photographers who don't need advanced video or speed

Quick take: The eos r100 has the highest resolution at 24mp; the eos m is the most affordable; only the eos-1d x mark iii is weather sealed. Scroll down for the full spec breakdown.

Full specifications

Specification	EOS-1D X Mark III (2020)	EOS M (2012)	EOS R100 (2023)
Price	£3,500	£80	£529
Sensor	20.1MP full-frame CMOS	18MP APS-C CMOS	24.1MP APS-C CMOS
Resolution	20.1MP	18.0MP	24.1MP
Video	5.5K RAW, 4K 60fps (crop), 4K 60fps (full-frame via firmware)	1080p 30fps	4K/30p (slight crop), 1080p/60p
Autofocus	191-point all cross-type OVF AF; 525-point Dual Pixel CMOS AF (Live View)	Contrast-detect AF only — notoriously slow	Dual Pixel CMOS AF, face detection, subject tracking
Stabilisation	—	—	None (no IBIS)
Burst Rate	16fps mechanical, 20fps live view	4fps	6.5fps mechanical
Battery Life	~2850 shots (CIPA)	~230 shots (CIPA)	~270 shots (CIPA)
Weight	1250g (body only)	262g (body only)	356g (body, battery, card)
Dimensions	158 × 167.6 × 82.6mm	108.6 × 66.5 × 32.3mm	116.3 × 85.5 × 68.8mm
Weather Sealed	Yes	No	No
Viewfinder	OVF 0.76× magnification, 100% coverage	None (optional EVF accessory)	EVF, 2.36M dots, 0.59× magnification
Screen	3.2" fully articulating touchscreen, 4.15M dots	3.0" fixed touchscreen, 1.04M dots	3.0" fixed touchscreen, 1.04M dots
Mount	Canon EF	Canon EF-M mount	Canon RF-mount
Memory Cards	Dual CFexpress Type B slots	1× SD/SDHC/SDXC	Single SD UHS-II
Connectivity	Wi-Fi 5GHz, Bluetooth 4.2, USB-C 3.1 Gen 2, Ethernet	USB 2.0	USB-C, Wi-Fi, Bluetooth

Suitability by genre

Genre	EOS-1D X Mark III	EOS M	EOS R100
Sports & Action	10.0	—	—
Wildlife	9.0	—	4.0
Wedding & Events	9.0	—	—
Portrait	8.0	6.0	9.0
Vlogging & Video	7.0	5.0	—
Street	7.0	6.0	7.0
Landscape	7.0	—	—
Casual	—	7.0	—
Travel	—	6.0	7.0
Video	—	—	7.0

GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →

⚡ Compare specs side by side EOS-1D X Mark III prices → EOS M prices → EOS R100 prices →

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Camera family history