EOS R100vs Pentax K-3 Mark IIIvs Ricoh GR III

GearFrame · Updated March 2026

Canon EOS R100 Canon EOS R100 (2023) From £529 Best for First camera / beginner photography View EOS R100
VS
Pentax Pentax K-3 Mark III Pentax Pentax K-3 Mark III (2021) From £1699 Best for DSLR enthusiasts & outdoor photographers View Pentax K-3 Mark III
VS
Ricoh Ricoh GR III Ricoh Ricoh GR III (2019) From £899 Best for Street photography & urban reportage View Ricoh GR III

Which should you buy?

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.

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.

Street Photography & Urban Reportage — Ricoh GR III (2019): The purest street photography compact — APS-C sensor, 28mm perspective, IBIS, and cult-favourite JPEG rendering in a shirt pocket.

↓ Full specifications below

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

Pentax K-3 Mark III (2021)

  • You're a committed DSLR photographer with significant investment in Pentax glass
  • You shoot in extreme weather conditions and place build quality and reliability above everything
  • You prefer optical viewfinder performance and want the best modern APS-C DSLR available

Ricoh GR III (2019)

  • You shoot street, travel, or documentary and want APS-C quality in a coat or shirt pocket
  • You want a camera you'll genuinely always carry without thinking about it
  • You appreciate sharp, characterful images from a fixed 28mm equivalent focal length

Quick take: The pentax k-3 mark iii has the highest resolution at 26mp; the eos r100 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 R100 (2023)Pentax K-3 Mark III (2021)Ricoh GR III (2019)
Price £529 £1,699 £899
Sensor 24.1MP APS-C CMOS 25.7MP APS-C BSI CMOS (AA-filterless) 24.2MP APS-C CMOS
Resolution 24.1MP 25.7MP 24.2MP
Video 4K/30p (slight crop), 1080p/60p 4K/30p, 1080p/60p 1080p/60p
Autofocus Dual Pixel CMOS AF, face detection, subject tracking SAFOX 13 phase-detect, 101-point (25 cross-type) Hybrid contrast/phase-detect AF with subject detection
Stabilisation None (no IBIS) 5.5-stop 5-axis IBIS (Shake Reduction III) 4-stop IBIS (Shake Reduction)
Burst Rate 6.5fps mechanical 12fps 4fps
Battery Life ~270 shots (CIPA) 800 shots (CIPA) 200 shots (CIPA)
Weight 356g (body, battery, card) 820g body only 257g
Dimensions 116.3 × 85.5 × 68.8mm 134.5 × 103.5 × 73.5mm 109.4 × 61.9 × 33.2mm
Weather Sealed No Yes No
Viewfinder EVF, 2.36M dots, 0.59× magnification Optical pentaprism, 100% coverage, 1.05× magnification None
Screen 3.0" fixed touchscreen, 1.04M dots 3.2" tilting touchscreen 3.0" fixed touchscreen
Mount Canon RF-mount Pentax KF-mount Fixed 28mm-equiv f/2.8 lens
Memory Cards Single SD UHS-II Dual SD UHS-II Single SD UHS-I
Connectivity USB-C, Wi-Fi, Bluetooth USB-C, Wi-Fi, Bluetooth USB-C, Wi-Fi, Bluetooth
⚡ Compare specs side by side EOS R100 prices → Pentax K-3 Mark III prices → Ricoh GR III prices →

Compare pairs from this group