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EOS Mvs Pentax K-3 Mark III

GearFrame · Updated March 2026

Canon EOS M Canon EOS M (2012) Starting from £80 new Best for Canon mirrorless history & EF-M collectors View EOS M
VS
Pentax Pentax K-3 Mark III Pentax Pentax K-3 Mark III (2021) Starting from £1699 new Best for DSLR enthusiasts & outdoor photographers View Pentax K-3 Mark III

GearScore™ Verdict — Which should you buy?

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.

Dslr Enthusiasts & Outdoor Photographers — Pentax K-3 Mark III (2021): The finest APS-C DSLR ever made — class-leading weather sealing, optical viewfinder, 5-axis IBIS, and extraordinary build for photographers committed to DSLR.

↓ Full specifications below

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

Pentax K-3 Mark III (2021)

  • DSLR photographers who want the finest APS-C optical viewfinder experience
  • Outdoor and weather photographers who need robust all-weather sealing
  • Pentax lens owners who want to use their existing K-mount glass
  • Photographers who prefer optical viewfinders and refuse to switch to mirrorless

Quick take: The pentax k-3 mark iii has the highest resolution at 26mp; the eos m is the most affordable; only the pentax k-3 mark iii is weather sealed. Scroll down for the full spec breakdown.

Full specifications

Specification EOS M (2012)Pentax K-3 Mark III (2021)
Price £80 £1,699
Sensor 18MP APS-C CMOS 25.7MP APS-C BSI CMOS (AA-filterless)
Resolution 18.0MP 25.7MP
Video 1080p 30fps 4K/30p, 1080p/60p
Autofocus Contrast-detect AF only — notoriously slow SAFOX 13 phase-detect, 101-point (25 cross-type)
Stabilisation 5.5-stop 5-axis IBIS (Shake Reduction III)
Burst Rate 4fps 12fps
Battery Life ~230 shots (CIPA) 800 shots (CIPA)
Weight 262g (body only) 820g body only
Dimensions 108.6 × 66.5 × 32.3mm 134.5 × 103.5 × 73.5mm
Weather Sealed No Yes
Viewfinder None (optional EVF accessory) Optical pentaprism, 100% coverage, 1.05× magnification
Screen 3.0" fixed touchscreen, 1.04M dots 3.2" tilting touchscreen
Mount Canon EF-M mount Pentax KF-mount
Memory Cards 1× SD/SDHC/SDXC Dual SD UHS-II
Connectivity USB 2.0 USB-C, Wi-Fi, Bluetooth
Genre EOS MPentax K-3 Mark III
Casual
7.0
Travel
6.0
7.0
Street
6.0
Portrait
6.0
7.0
Vlogging & Video
5.0
4.0
Landscape
9.0
Wildlife
9.0
Sports & Action
9.0

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

⚡ Compare specs side by side EOS M prices → Pentax K-3 Mark III prices →

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