Pentax K-3 Mark IIIvs A7R IV
Pentax
Pentax K-3 Mark III (2021)
Starting from £1699 new
Best for DSLR enthusiasts & outdoor photographers
View Pentax K-3 Mark III
VS
GearScore™ Verdict — Which should you buy?
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.
Landscape, Studio, Commercial — A7R IV (2019): 61MP in a mirrorless body — the resolution benchmark.
Who should buy what
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
A7R IV (2019)
- Landscape photographers who print large
- Studio shooters needing maximum detail
Quick take: The a7r iv has the highest resolution at 61mp; the pentax k-3 mark iii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | Pentax K-3 Mark III (2021) | A7R IV (2019) |
|---|---|---|
| Price | £1,699 | £2,199 |
| Sensor | 25.7MP APS-C BSI CMOS (AA-filterless) | Full-frame BSI Exmor R CMOS 35mm |
| Resolution | 25.7MP | 61.0MP |
| Video | 4K/30p, 1080p/60p | 4K 30fps |
| Autofocus | SAFOX 13 phase-detect, 101-point (25 cross-type) | 567-point phase-detect, real-time tracking |
| Stabilisation | 5.5-stop 5-axis IBIS (Shake Reduction III) | 5-axis IBIS, 5.5 stops |
| Burst Rate | 12fps | 10fps |
| Battery Life | 800 shots (CIPA) | 670 shots (CIPA) |
| Weight | 820g body only | 665g (body only) |
| Dimensions | 134.5 × 103.5 × 73.5mm | 128.9 × 96.4 × 77.5mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | Optical pentaprism, 100% coverage, 1.05× magnification | EVF 0.78× 5.76M-dot |
| Screen | 3.2" tilting touchscreen | 3.0" tilting touchscreen, 1.44M-dot |
| Mount | Pentax KF-mount | Sony E-Mount |
| Memory Cards | Dual SD UHS-II | 2× SD UHS-II / CFexpress Type A |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Wi-Fi 5GHz, Bluetooth 4.1, USB-C 3.2 |
Suitability by genre
| Genre | Pentax K-3 Mark III | A7R IV |
|---|---|---|
| Landscape | — | |
| Wildlife | — | |
| Sports & Action | — | |
| Portrait | — | |
| Travel | — | |
| Vlogging & Video | — |
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