What is a ORF file?
ORF is the RAW format of Olympus cameras and their OM System successors — the OM-D and PEN lines and today's OM-1 and OM-5. Files are 12-bit and comparatively small (a 20 MP ORF runs around 17-20 MB), which suits the system's identity: light kit, long glass, high frame rates.
Micro Four Thirds shooters skew toward wildlife, birding, and travel — exactly the genres that produce enormous burst sets. Pro Capture mode alone can write 50+ frames per press.
ORF at a glance
| Extension | .ORF |
|---|---|
| Maker | Olympus / OM System |
| Introduced | 2003 (E-1) |
| Container | TIFF-based |
| Bit depth | 12-bit |
| Compression | Lossless |
| Shot by | OM-D E-M1/E-M5/E-M10 series, PEN-F, OM System OM-1/OM-3/OM-5 |
How to open ORF files free
imagic reads ORF natively. The fit for OM shooters is the burst problem: Pro Capture and 20+ fps sequences mean a morning of birding is thousands of near-identical frames, and the duplicate grouping plus sharpness scoring picks the sharp wing-beat out of fifty before you look at any of them.
darktable, RawTherapee, and OM Workspace (free from OM System) all open ORF.
Converting ORF files
ORF is small and universally read; conversion is rarely worth it. Batch JPEG export handles delivery, and stacking/HDR workflows can take TIFF handoffs.
Cameras that shoot ORF
14 popular bodies in our camera guide write .ORF files, including:
Frequently asked questions
What software opens ORF files free?
imagic (7-day trial, no card), OM Workspace, darktable, and RawTherapee. For burst-heavy wildlife shoots, automated duplicate grouping saves more time than any editing feature.
Are 12-bit ORF files a quality limitation?
In practice rarely. The smaller Four Thirds sensor is the bigger physical constraint; 12-bit depth is well matched to it, and files stay small and fast to process as a result.
Does imagic support OM System bodies like the OM-1?
Yes — OM System kept the ORF format and imagic reads it the same as Olympus-era files, with processing through the bundled RawTherapee engine.
Other RAW formats
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