Canon EOS R3vs EOS RPvs Pentax K-3 Mark III
Canon
Canon EOS R3 (2021)
From £5999
Best for Sports & photojournalism professionals
View Canon EOS R3
Pentax
Pentax K-3 Mark III (2021)
From £1699
Best for DSLR enthusiasts & outdoor photographers
View Pentax K-3 Mark III
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.
Entry Full-Frame Stills Photography — EOS RP (2019): An affordable gateway into the RF system. The RP makes sense as a stepping stone camera — if you're committed to Canon RF glass, this is the cheapest full-frame body to buy those lenses for. Just manage expectations on video and battery life.
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.
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
EOS RP (2019)
- Canon users who want to start investing in RF glass affordably
- Stills photographers who shoot primarily in good light
- Anyone coming from a Canon DSLR wanting the RF system at low cost
- Travel photographers who prioritise compactness over video specs
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
Quick take: The eos rp has the highest resolution at 26mp; the eos rp is the most affordable; only the canon eos r3, pentax k-3 mark iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | Canon EOS R3 (2021) | EOS RP (2019) | Pentax K-3 Mark III (2021) |
|---|---|---|---|
| Price | £5,999 | £799 | £1,699 |
| Sensor | 24.1MP full-frame BSI stacked CMOS | 26.2MP Full-Frame CMOS | 25.7MP APS-C BSI CMOS (AA-filterless) |
| Resolution | 24.1MP | 26.2MP | 25.7MP |
| Video | 6K RAW, 4K/120p, 1080p/180p | 4K/24p (with 1.7× crop), 1080p/60p | 4K/30p, 1080p/60p |
| Autofocus | Dual Pixel CMOS AF II with Eye Control AF | Dual Pixel CMOS AF, 4779 manually selectable positions | SAFOX 13 phase-detect, 101-point (25 cross-type) |
| Stabilisation | 8-stop IBIS | None (no IBIS) | 5.5-stop 5-axis IBIS (Shake Reduction III) |
| Burst Rate | 30fps electronic / 12fps mechanical | 5fps mechanical | 12fps |
| Battery Life | 620 shots (CIPA) | ~250 shots (CIPA) — very limited | 800 shots (CIPA) |
| Weight | 1015g body only | 485g (body, battery, card) | 820g body only |
| Dimensions | 150.0 × 142.6 × 87.2mm | 132.5 × 85.0 × 70.0mm | 134.5 × 103.5 × 73.5mm |
| Weather Sealed | Yes | No | Yes |
| Viewfinder | 0.76" OLED EVF, 5.76M dots, 120fps | EVF, 2.36M dots, 0.70× magnification | Optical pentaprism, 100% coverage, 1.05× magnification |
| Screen | 3.2" fully articulating touchscreen | 3.0" vari-angle touchscreen, 1.04M dots | 3.2" tilting touchscreen |
| Mount | Canon RF | Canon RF-mount | Pentax KF-mount |
| Memory Cards | Dual CFexpress Type B | Single SD UHS-II | Dual SD UHS-II |
| Connectivity | USB-C 3.2, HDMI full-size, Wi-Fi 6, Bluetooth, LAN | USB-C, Wi-Fi, Bluetooth | USB-C, Wi-Fi, Bluetooth |
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