Pentax K-3 Pentax K-3 Mark III DSLR Camera with 55-300mm Lens Review
The Pentax K-3 Mark III is a phenomenal DSLR, but it's a camera for a very specific person. Find out if you're that person, or if you should buy a modern mirrorless instead.
The 30-Second Version
A brilliant, expensive love letter to the DSLR, aimed squarely at Pentax fans. For everyone else, it's a relic from a bygone era.
Overview
The Pentax K-3 Mark III is the ultimate DSLR for die-hard Pentax fans, and that's the one thing you need to know. It's a tank, built with a legendary 101-point autofocus system and a gorgeous optical viewfinder. But it's also a niche product in a world that's moved to mirrorless. This bundle with the 70-210mm lens and battery grip is a serious kit for someone who wants a complete, weather-ready telephoto setup right out of the box.
Performance
The autofocus is the star here, landing in the 95th percentile in our database. That SAFOX 13 system is fast and confident, which surprised us given it's in a DSLR. The 12fps burst is solid, and the 5-axis IBIS is top-tier. What didn't surprise us? The video specs are just okay, and the fixed rear screen feels dated. It's a powerhouse for stills, but it's not trying to win any videography awards.
Pros & Cons
Pros
- Strong battery (100th percentile) 100th
- Strong af (94th percentile) 94th
- Strong stabilization (90th percentile) 90th
- Strong connectivity (88th percentile) 88th
Cons
Specifications
Full Specifications
Sensor
| Type | 23.3 x 15.5 mm (APS-C) CMOS |
| Size | APS-C |
| Megapixels | 25.73 |
| ISO Range | 100 |
Autofocus
| AF Points | 101 |
| AF Type | Phase Detection: 101 (25 Cross-Type) |
Shooting
| Burst (Mechanical) | 12 |
| Max Shutter | 1/8000 |
| Electronic Shutter | No |
Video
| Max Resolution | 4K |
| 10-bit | No |
Display & EVF
| Screen Size | 3.2 |
| Touchscreen | Yes |
Build
| Weight | 0.7 kg / 1.6 lbs |
| Battery Life | 800 |
Connectivity
| Wi-Fi | Yes |
| Bluetooth | Yes |
| USB | USB-C |
| HDMI | Micro-HDMI |
Value & Pricing
Worth it? Only if you're a Pentax loyalist. The price spread is from $3191 to $3494, so shop around. For anyone else, that's a lot of money for an APS-C DSLR when full-frame mirrorless options exist at similar prices. You're buying into a specific ecosystem and experience, not the latest tech.
vs Competition
Look at the Fujifilm X-H2 or the OM System OM-1 if you want a modern APS-C powerhouse. Both are mirrorless, have better video, and more advanced features. The Canon EOS R6 Mark II is a full-frame mirrorless that's similarly priced and blows this away for autofocus and video. The Pentax wins if you love optical viewfinders, have a drawer full of Pentax lenses, or just really hate mirrorless cameras. It's a choice of philosophy, not specs.
| Spec | Pentax K-3 Pentax K-3 Mark III DSLR Camera with 55-300mm Lens | Sony Alpha 1 Sony a1 II Mirrorless Camera | Nikon Z6 Nikon Z6 III Mirrorless Camera with 28-400mm f/4-8 | Canon EOS R6 Canon EOS R6 Mark III Mirrorless Camera with | Fujifilm X-H2 FUJIFILM X-H2 Mirrorless Camera | Panasonic LUMIX GH7 Panasonic LUMIX GH7 Mirrorless Camera with 12-35mm |
|---|---|---|---|---|---|---|
| Type | - | Mirrorless | Mirrorless | Mirrorless | Mirrorless | Mirrorless |
| Sensor | 25.7MP APS-C | 50.1MP Full Frame | 24.5MP Full Frame | 32.5MP Full Frame | 40.2MP APS-C | 25.2MP Four Thirds |
| AF Points | 101 | 759 | 299 | 1053 | 425 | 315 |
| Burst FPS | 12 | 30 | 20 | 40 | 20 | 75 |
| Video | 4K | 8K @120fps | 5K @120fps | 6K @120fps | 8K @60fps | 5K |
| IBIS | true | true | true | true | true | true |
| Weather Sealed | false | false | true | false | true | false |
| Weight (g) | 726 | 658 | 669 | 590 | 590 | 726 |
Common Questions
Q: Is the battery grip included with this kit?
Yes, the D-BG8 grip is part of this bundle. It gives you longer battery life and a more comfortable hold, especially with the telephoto lens.
Q: Can I use my old Pentax K-5 battery grip on this?
No, it won't fit. The K-3 Mark III needs its own specific grip, the D-BG8. They changed the body design.
Q: What's the max resolution with a big lens like the 150-450mm?
You'll get the full 25.7MP resolution with any compatible lens. The sensor doesn't crop; it uses all the pixels regardless of the lens attached.
Who Should Skip This
If you're a beginner, a vlogger, or just looking for the best modern camera for your money, skip this. It's not for you. Go get a Fujifilm X-S20 or a Sony a7 IV instead. This is for the Pentax faithful, period.
Verdict
We can't recommend this as a general-purpose camera. It's too expensive and too specialized. But if you're the specific person it's for—a Pentax shooter who wants the absolute best DSLR they can buy, with a great telephoto lens and grip included—it's a fantastic kit. For everyone else, go mirrorless.