Pentax
K-3 Mark III
APS-C DSLR flagship with optical viewfinder and weather sealing.
$1,999
Last updated May 2026
Key specs at a glance
Resolution
25.7 MP
Sensor
APS-C
ISO max
25,600
Burst
20 fps
4K
60 fps
IBIS
7-stop
Weight
520 g
Battery
640 shots
Sensor size
Pentax K-3 Mark III
23.5 × 15.6 mm · APS-C
367 mm² area
Lens ecosystem
Pentax K mount
30
First-party
40
Third-party
70+
Total available
Mount introduced 1975
Body size
Pentax K-3 Mark III
138 × 98 × 88 mm
520 g (1.15 lb / 18.34 oz)
138 × 98 × 88 mm · 520 g (1.15 lb / 18.34 oz)
Best for
Use-case scores
Scored algorithmically from verified specs. 10 = best in class.
Portrait
Good- · 25.7MP — solid resolution
- · Eye AF locks focus on subjects reliably
Sports & Action
Good- · 20fps burst — fast action ready
- · Pre-Capture records before you press shutter
Video & Hybrid
Good- · 4K recording
- · 4K 60p smooth motion
Landscape
Fair- · Weather sealed for outdoor conditions
- · IBIS enables slower handheld shutter speeds
Travel
Excellent- · 520g — compact and travel-friendly
- · 640 shots/charge — all-day shooting
Wildlife
Excellent- · 20fps burst captures fleeting moments
- · Bird AF subject recognition
Vlogging
Good- · 4K 60p for smooth handheld vlogs
- · IBIS reduces handheld shake
Pros
- ✓ Optical viewfinder
- ✓ Weather sealed
- ✓ IBIS in DSLR
Cons
- – DSLR system declining
- – APS-C
- – Limited video
Explore related cameras
Continue from Pentax K-3 Mark III into comparisons and alternatives.
Popular comparisons
Existing matchups that include this camera.
Similar cameras
Comparable bodies by sensor class or camera category.
- Fujifilm X-H2S$2,499Compare
- Fujifilm X100VI$1,599Compare
- Canon EOS R7$1,499Compare
- Ricoh GR IV$1,499Compare
More from Pentax
Same-brand alternatives in the database.
Full specifications
Verified specs · Pentax K-3 Mark III