Reference Formats
ORF
Olympus's (now OM System's) TIFF-based RAW format, introduced with the Olympus E-10, storing unprocessed sensor data plus Olympus-specific MakerNotes across the E-System DSLR and Micro Four Thirds/OM mirrorless lines.
Extension
.orf
Full name
Olympus RAW Format
Introduced
2000, with the Olympus E-10
Vendor
Olympus (camera business now operating as OM System / OM Digital Solutions since 2021)
What is inside the container
ORF is TIFF-like with a distinct file signature, embedding a JPEG preview and Exif/MakerNotes covering Picture Mode settings, in-body image-stabilization data, and Four Thirds/Micro Four Thirds lens information. Because Olympus's camera division became OM System in 2021, the format's ongoing decoder support and documentation now spans two successive company identities, which is worth flagging explicitly in a DAM's format-longevity notes rather than assuming continuity.
How to open it
For archives
Convert ORF assets to DNG for archival masters. ORF is a lower-volume format than Canon, Nikon, or Sony's raw formats, so third-party raw engines sometimes lag on day-one support for brand-new OM System bodies, and the 2021 Olympus-to-OM System business transition is a concrete reminder that vendor continuity for a proprietary RAW format is never fully guaranteed.
Olympus introduced ORF in 2000 with the E-10, an early digital SLR-style camera, well before most competitors had settled on a dedicated raw format of their own. ORF stayed Olympus’s standard raw container through the E-System DSLR line and into the Micro Four Thirds mirrorless cameras the company pioneered, and it carried forward unchanged in naming even after Olympus sold its camera and audio business in 2021, with the resulting company rebranding as OM System.
That corporate transition is the most distinctive DAM consideration for ORF: a format whose long-term maintenance now depends on a company that only came into existence in 2021, inheriting responsibility for a raw format with roots going back two decades earlier. Combined with Olympus/OM System’s comparatively smaller market share next to Canon, Nikon, and Sony, third-party raw engines have sometimes taken longer to add support for brand-new OM System camera bodies than they do for the larger manufacturers’ latest models. A DAM archiving ORF assets should treat that support lag as a real risk factor and lean toward DNG normalization rather than assuming ORF will always be readable on the same timeline as the bigger formats.
Frequently asked
Does ORF's vendor continuity affect DAM format-longevity planning?
Yes. Olympus's camera division became OM System in 2021, so ORF's ongoing decoder support and documentation now spans two successive company identities, which is worth flagging explicitly in a DAM's format-longevity notes rather than assuming continuity.
Should a DAM convert ORF assets to DNG?
Yes. ORF is a lower-volume format than Canon, Nikon, or Sony's raw formats, so third-party raw engines sometimes lag on day-one support for brand-new bodies, making DNG conversion a sensible archival step.
What metadata does ORF carry in its MakerNotes?
Picture Mode settings, in-body image-stabilization data, and Four Thirds/Micro Four Thirds lens information, alongside standard Exif fields and an embedded JPEG preview.
Is ORF structurally related to TIFF?
Yes. ORF is TIFF-like with a distinct file signature, following the same general pattern as other vendor raw formats.
When was ORF introduced?
2000, with the Olympus E-10.
What native software opens ORF?
OM Workspace, formerly known as Olympus Viewer/Workspace, alongside cross-vendor tools like Adobe Camera Raw/Lightroom Classic, Capture One, RawTherapee, and darktable.
Why might day-one support lag for new OM System camera bodies?
ORF is a lower-volume format compared to the major manufacturers, so third-party raw engines sometimes take longer to add support for brand-new bodies.
What real-world event illustrates why vendor continuity for proprietary RAW formats isn't guaranteed?
Olympus's 2021 transition of its camera business to OM System is a concrete reminder that even an established manufacturer's raw-format support can change hands or continuity, unlike an openly published standard.
Sources
- The Olympus RAW Format (ORF) was introduced in 2000 with the launch of the Olympus E-10. checked 2026-08-07 — Wikipedia - Olympus E-10
- ORF is a TIFF-like raw image format produced by Olympus digital cameras, with a distinct file signature from standard TIFF. checked 2026-08-07 — Wikipedia - ORF format
- Olympus sold its camera and audio business in 2021, with the resulting company operating as OM Digital Solutions / OM System, continuing the camera line including raw format support. checked 2026-08-07 — Wikipedia - Olympus E-30 (background on Olympus camera business)