What Is an SR2 File? Sony's RAW Before Alpha, Explained

Q: What does SR2 stand for?

SR2 is Sony RAW, second generation — the TIFF-based format the DSC-R1 wrote in 2005, after the SRF files of the early Cyber-shot era and just before the Alpha line arrived with ARW in 2006.

Q: Which camera writes SR2 files?

The Sony DSC-R1 from 2005 — Sony's large-sensor bridge camera from just before the Alpha era, with a roughly 10-megapixel, APS-C-sized sensor. One year later, the first Alpha bodies switched to the ARW format that Sony still uses today.

Q: What is the difference between SR2 and ARW?

Timing, mostly. SR2 is the format of the DSC-R1, from 2005; ARW arrived in 2006 when Sony bought Konica Minolta's camera business and launched the Alpha line. Both are digital negatives — SR2 is simply the last stop before ARW.

Q: What if an SR2 file won't open in anything?

Convert it once to DNG with Adobe's free DNG Converter. DNG is widely supported, so the photo becomes openable almost anywhere — and keep the original SR2 alongside the DNG rather than replacing it.

Q: Can RevelRaw open SR2 files?

Yes — drag one in. RevelRaw is built for Sony shooters, and SR2 is part of the family. For a veteran format like this, support ultimately depends on your Mac's RAW engine; if a particular file won't open, convert it once to DNG with Adobe's free DNG Converter and keep both files.

Published July 24, 2026 · Daniel Tello · RevelRaw

An SR2 file is Sony RAW from the moment just before everything changed. In 2005 Sony shipped the DSC-R1, a bridge camera with an APS-C-sized sensor of roughly 10 megapixels — serious hardware for a company that didn't yet make interchangeable-lens cameras — and when you shot RAW, it wrote .SR2. Like every RAW format before and since, an SR2 is a digital negative: the sensor's unprocessed readings from the moment of exposure, plus metadata, waiting to be developed into a photograph.

The timing is what makes the format special. Soon after the R1, Sony bought Konica Minolta's camera business and launched the Alpha line in 2006 with a new format, .ARW — the extension every Sony Alpha body writes to this day. That makes SR2 the missing link between the Cyber-shot experiments and the Alpha system: the last stop before ARW. If you shot an R1 back then, or just found a drive of .SR2 files in a closet, here's what they are and how to bring them back on a modern Mac.

SR2 at a glance

Full name	Sony RAW, second generation
Extension	.SR2
Introduced	2005
Written by	The Sony DSC-R1, Sony's large-sensor bridge camera from just before the Alpha era
What it holds	Unprocessed sensor data and metadata
Structure	TIFF-based, like most camera RAW formats
Typical size	Small by modern standards — this was the ~10 MP era, so a whole card of them fits in the space of a few of today's RAW files
Opens with	RAW editors that read Sony's veteran formats, RevelRaw among them; Adobe's free DNG Converter as a fallback

What's actually inside an SR2 file

A camera sensor doesn't record a picture. Each photosite records how much light hit it through a single-color filter — red, green or blue — arranged in a mosaic. An SR2 file stores those readings as they came off the sensor:

The mosaic sensor data. One brightness value per photosite, straight off the R1's APS-C-sized sensor. No white balance, no sharpening, none of the camera's color settings have been applied yet. Turning the mosaic into a viewable photograph is the job of your RAW editor — which is why a twenty-year-old SR2 can be developed with today's tools, better than 2005's in-camera processing ever managed.
Metadata. Camera, lens, exposure settings, and the picture parameters you had dialed in. Editors read this to know how to interpret the data; nothing in it is baked into the pixels.
A familiar skeleton. SR2 is built on TIFF, the same foundation most RAW formats share — including the ARW files Sony has written ever since. Structurally, the family resemblance was already there.

Rescuing an SR2 archive

Modern software is written with current cameras in mind, and macOS support for a body as veteran as the R1 varies from one macOS version to the next. So don't count on Finder or Preview showing you anything useful — a blank thumbnail doesn't mean the file is broken. The negative is almost certainly intact; it's the viewer that has moved on.

Three habits will keep the archive safe. First, get the files off aging CDs, cards and drives and onto storage you trust. Second, open them in an editor that reads SR2 and export the keepers to a modern format. Third, if a file won't open anywhere, convert it once to DNG with Adobe's free DNG Converter — DNG opens almost everywhere — and keep both files, the DNG for working and the SR2 as the original.

How to open SR2 files on a Mac

The reliable route is a RAW editor that treats Sony's back catalog as family. RevelRaw is built for Sony shooters — Alpha and .ARW are its home turf — so a Sony archive from the year before Alpha existed belongs here: drag an .SR2 in or pick it from File > Open, and AI scene detection ranks 40+ presets against your photo, with the standard fine-tune controls on top. Everything runs on your Mac; no file ever leaves it — a twenty-year-old archive stays exactly as private as it was in its shoebox.

One honest caveat: for veteran formats like this, support ultimately depends on your Mac's RAW engine, which changes with macOS versions. If a particular file won't open, the DNG Converter route above gets it open — once, for good.

How to convert SR2 to JPEG

Open the file in a RAW editor and export. RevelRaw exports JPEG, PNG, TIFF and HEIF, with platform presets for Instagram, print and web — so a rescued negative goes straight to a shareable file, developed properly this time around. Whatever you export, keep the SR2 afterwards: the negative survived twenty years; it deserves to survive the conversion too.

FAQ

What does SR2 stand for?

Sony RAW, second generation — after the SRF files of the early Cyber-shot era, and just before the Alpha line arrived with ARW in 2006. It's TIFF-based, like most RAW formats.

Which camera writes SR2 files?

The Sony DSC-R1 from 2005 — the large-sensor bridge camera Sony built just before the Alpha era, with a roughly 10-megapixel, APS-C-sized sensor.

What is the difference between SR2 and ARW?

Timing, mostly. SR2 is the R1's format from 2005; ARW arrived in 2006, when Sony bought Konica Minolta's camera business and launched Alpha. Both are digital negatives — SR2 is simply the last stop before ARW.

What if an SR2 file won't open in anything?

Convert it once to DNG with Adobe's free DNG Converter. The DNG will open almost anywhere — and keep the original SR2 alongside it rather than replacing it.

Can RevelRaw open SR2 files?

Yes — drag one in. For a format this veteran, support ultimately depends on your Mac's RAW engine; if a file won't open, convert it once to DNG and keep both. Once it's open, presets, scene detection and fine-tune controls all work, and exports go out as JPEG, PNG, TIFF or HEIF.

Sony shooters with old archives are home here. Download RevelRaw, drop an SR2 in, and watch it ranked against 40+ presets in seconds — with one full-quality export on the house. Get it on the Mac App Store.