Pentax
Pentax K-3 Mark III 2021
Best for DSLR enthusiasts & outdoor photographers
£1048
used today at eBay
Decision tools · Compare
Pentax K-3 Mark III vs A99 II
Quick take: The A99 II has the highest resolution at 42MP; the A99 II is the most affordable; only the Pentax K-3 Mark III is weather sealed.
16 specs side by side·15 genres scored·UK prices from Wex Photo Video and Clifton Cameras
How to read this page. Highlighted cells win that row on the spec alone. Genre scores are the engine's base scores (enthusiast, photo and video); Camera Match re-weights them for your level and priorities. Price buttons are affiliate links; the price you pay is the same.
Price buttons are affiliate links — GearFrame may earn a commission at no extra cost to you. It never affects a score. Learn more
Verdictwhich should you buy?
Pentax K-3 Mark III — Dslr Enthusiasts & Outdoor Photographers: 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
Pentax K-3 Mark III (2021)
is the right camera for you if…
- 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
Full specificationsthe better value in each row is highlighted
| Specification | Pentax K-3 Mark IIIPentax · 2021 | A99 IISony · 2016 |
|---|---|---|
| Price | £1,048 used | £749 usedBest |
| Sensor | 25.7MP APS-C BSI CMOS (AA-filterless) | 42.4MP full-frame sensor |
| Resolution | 25.7MP | 42.4MPBest |
| Video | 4K/30p, 1080p/60p | 4K/30p full-pixel readout, 1080p/120, S-Log2 / S-Log3 |
| Autofocus | SAFOX 13 phase-detect, 101-point (25 cross-type) | 79-point Hybrid Cross phase-detect AF (dedicated sensor + 399-point on-sensor), Eye AF |
| Stabilisation | 5.5-stop 5-axis IBIS (Shake Reduction III) | 4.5-stop 5-axis sensor-shift |
| Burst Rate | 12fps | 12fps with AF/AE tracking |
| Battery Life | 800 shots (CIPA)Best | ~490 shots (CIPA) |
| Weight | 820g (body only)Best | 849g (with battery and card) |
| Dimensions | 134.5 × 103.5 × 73.5mm | 142.6 × 104.2 × 76.1mm |
| Weather Sealed | YesBest | Not weather sealed |
| Viewfinder | Optical pentaprism, 100% coverage, 1.05× magnification | OLED EVF, 2.36M dots, 0.78x |
| Screen | 3.2" fixed touchscreen | 3.0" three-way tilting / swivel LCD, 1.23M dots |
| Mount | Pentax KF-mount | Sony A-mount |
| Memory Cards | Dual SD UHS-II | Dual slots: SD / Memory Stick + SD |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Multi / micro USB, micro HDMI, 3.5mm mic + headphone, Multi Interface Shoe, Wi-Fi, NFC |
Wins the row — price, resolution, burst, battery, weight and sealing are compared; text specs aren't ranked.
How they score by genreengine base scores out of 10
Genre
Pentax K-3 Mark III
A99 II
Portrait
6.6/10
6.6/10
Street
5.2/10
5.2/10
Travel
5.3/10
4.6/10
Wedding & Events
7.0/10
6.2/10
Filmmaking
5.4/10
5.9/10
Documentary
6.4/10
5.0/10
Sports & Action
6.8/10
5.9/10
Landscape
6.2/10
5.8/10
Wildlife
6.8/10
5.7/10
Casual
4.1/10
3.5/10
Food
5.4/10
6.0/10
Macro
4.9/10
4.7/10
Architecture
6.0/10
6.2/10
Astrophotography
6.5/10
5.2/10
Vlogging & Video
—
4.3/10
Scores come from the same engine as Camera Match: verified specifications weighted by what each genre needs, with documented adjustments. The product page and this table show the enthusiast base score. See how scores are calculated →
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