EOS R100vs Pentax K-3 Mark IIIvs A7C II
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?
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.
Full-Frame Hybrid — A7C II (2023): Full-frame AI autofocus in the most compact body available — the best camera under £1,500 for hybrid shooters.
Who should buy what
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
A7C II (2023)
- You want full-frame image quality in the most compact body possible
- You travel constantly and need a serious camera that doesn't weigh down your bag
- You're a portrait or lifestyle photographer who shoots on the move
- You create content for social media or YouTube and want full-frame quality in a vlog-friendly form
Quick take: The a7c ii has the highest resolution at 33mp; 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) | A7C II (2023) |
|---|---|---|---|
| Price | £529 | £1,699 | £1,499 |
| Sensor | 24.1MP APS-C CMOS | 25.7MP APS-C BSI CMOS (AA-filterless) | 33MP Full-frame Exmor R BSI CMOS |
| Resolution | 24.1MP | 25.7MP | 33.0MP |
| Video | 4K/30p (slight crop), 1080p/60p | 4K/30p, 1080p/60p | 4K/60p oversampled, S-Log3, 10-bit internal |
| Autofocus | Dual Pixel CMOS AF, face detection, subject tracking | SAFOX 13 phase-detect, 101-point (25 cross-type) | 759-point phase-detect, AI subject recognition |
| Stabilisation | None (no IBIS) | 5.5-stop 5-axis IBIS (Shake Reduction III) | 5-axis IBIS, 7.0 stops |
| Burst Rate | 6.5fps mechanical | 12fps | 10fps mechanical, 30fps electronic |
| Battery Life | ~270 shots (CIPA) | 800 shots (CIPA) | ~530 shots (CIPA) |
| Weight | 356g (body, battery, card) | 820g body only | 514g body only |
| Dimensions | 116.3 × 85.5 × 68.8mm | 134.5 × 103.5 × 73.5mm | 124.0 × 71.1 × 63.4mm |
| Weather Sealed | No | Yes | No |
| Viewfinder | EVF, 2.36M dots, 0.59× magnification | Optical pentaprism, 100% coverage, 1.05× magnification | EVF, 2.36M dots, 0.70× magnification |
| Screen | 3.0" fixed touchscreen, 1.04M dots | 3.2" tilting touchscreen | 3.0" vari-angle touchscreen |
| Mount | Canon RF-mount | Pentax KF-mount | Sony FE (full-frame E-mount) |
| Memory Cards | Single SD UHS-II | Dual SD UHS-II | Dual slots: SD UHS-II + CFexpress Type A |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C, Wi-Fi, Bluetooth | USB-C (3.2), Bluetooth, Wi-Fi |
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