EOS RPvs Olympus OM-D E-M5 IIIvs Pentax K-3 Mark III
OM System
Olympus OM-D E-M5 III (2019)
From £699
Best for Travel & lightweight outdoor photography
View Olympus OM-D E-M5 III
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?
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.
Travel & Lightweight Outdoor Photography — Olympus OM-D E-M5 III (2019): The lightest weather-sealed MFT camera — compact, travel-friendly, and capable with 7.5-stop IBIS in a body that fits in a jacket pocket.
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
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
Olympus OM-D E-M5 III (2019)
- You want a lightweight, sealed camera for travel and outdoor photography
- You're new to Micro Four Thirds and want a capable mid-range body with excellent stabilisation
- Note: consider the newer OM-5 for updated specs in a similar compact form factor
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 olympus om-d e-m5 iii is the most affordable; only the olympus om-d e-m5 iii, pentax k-3 mark iii are weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS RP (2019) | Olympus OM-D E-M5 III (2019) | Pentax K-3 Mark III (2021) |
|---|---|---|---|
| Price | £799 | £699 | £1,699 |
| Sensor | 26.2MP Full-Frame CMOS | 20.4MP Micro Four Thirds Live MOS | 25.7MP APS-C BSI CMOS (AA-filterless) |
| Resolution | 26.2MP | 20.4MP | 25.7MP |
| Video | 4K/24p (with 1.7× crop), 1080p/60p | 4K/30p, 1080p/120p | 4K/30p, 1080p/60p |
| Autofocus | Dual Pixel CMOS AF, 4779 manually selectable positions | Hybrid phase/contrast AF with face/eye detection | SAFOX 13 phase-detect, 101-point (25 cross-type) |
| Stabilisation | None (no IBIS) | 7.5-stop 5-axis IBIS | 5.5-stop 5-axis IBIS (Shake Reduction III) |
| Burst Rate | 5fps mechanical | 30fps electronic / 10fps mechanical | 12fps |
| Battery Life | ~250 shots (CIPA) — very limited | 390 shots (CIPA) | 800 shots (CIPA) |
| Weight | 485g (body, battery, card) | 414g body only | 820g body only |
| Dimensions | 132.5 × 85.0 × 70.0mm | 125.3 × 85.2 × 49.7mm | 134.5 × 103.5 × 73.5mm |
| Weather Sealed | No | Yes | Yes |
| Viewfinder | EVF, 2.36M dots, 0.70× magnification | 0.35" OLED EVF, 2.36M dots | Optical pentaprism, 100% coverage, 1.05× magnification |
| Screen | 3.0" vari-angle touchscreen, 1.04M dots | 3.0" fully articulating touchscreen | 3.2" tilting touchscreen |
| Mount | Canon RF-mount | Micro Four Thirds | Pentax KF-mount |
| Memory Cards | Single SD UHS-II | Single SD UHS-I | Dual SD UHS-II |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Micro USB, Wi-Fi, Bluetooth | USB-C, Wi-Fi, Bluetooth |
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