.PEF · 2021 · 26 MP APS-C

Pentax K-3 Mark III RAW Files: Open, Cull & Edit .PEF Free

Pentax's most modern flagship APS-C body, popular with loyal Pentax shooters doing landscape, wildlife, and general outdoor photography. An improved autofocus system and 12 fps burst broadened its use into casual action work. Outdoor trips with this camera mix deliberate landscape frames with faster bursts, both worth sorting before editing.

Pentax K-3 Mark III RAW at a glance

RAW formatPEF — Pentax Electronic Format (.PEF)
Sensor26 MP APS-C
Resolution26 megapixels
Typical RAW sizeabout 26-33 MB
Released2021
RAW options14-bit PEF RAW with lossless compression; DNG is also available in-camera.

Editing K-3 Mark III files with imagic

imagic opens .PEF files from the Pentax K-3 Mark III natively on Windows and macOS. Point it at a card or shoot folder and it builds previews, scores every frame for sharpness, closed eyes, and composition, and groups near-duplicate bursts — so a full shoot collapses to its keepers before you edit anything.

Processing runs through the bundled RawTherapee engine, entirely on your machine: batch-apply one look across the keepers and export JPEGs in a single pass. Nothing uploads, which matters at about 26-33 MB per frame. The 7-day trial is full-featured and needs no card; licenses are one-time, from €19.

Frequently asked questions

What RAW format does the Pentax K-3 Mark III use?

The Pentax K-3 Mark III writes PEF files with the .PEF extension. 14-bit PEF RAW with lossless compression; DNG is also available in-camera.

How big are Pentax K-3 Mark III RAW files?

Expect about 26-33 MB per frame from the 26 MP APS-C sensor, depending on compression settings and scene detail. A full shoot adds up quickly, which is why culling before editing matters on this body.

How can I open Pentax K-3 Mark III .PEF files for free?

imagic opens PEF files from the Pentax K-3 Mark III natively on Windows and macOS — the 7-day trial needs no card. It culls the shoot with AI quality scoring, groups duplicates, and batch-processes keepers locally through its RawTherapee engine.

More about PEF

The K-3 Mark III's .PEF files share their structure with every Pentax (Ricoh Imaging) body using PEF — the full PEF guide covers compression variants, free openers, and conversion options in depth.

Other Pentax bodies

Pentax K-1 Mark II Pentax K-3 Pentax K-S2 Pentax K-3 II Pentax K-70 Pentax K-1 Pentax KP

Cull a K-3 Mark III shoot before your coffee cools

AI quality scoring, duplicate grouping, and local batch processing for .PEF — free for 7 days, no card required.

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