Sony A7S III RAW at a glance
| RAW format | ARW — Sony Alpha RAW (.ARW) |
|---|---|
| Sensor | 12 MP full-frame |
| Resolution | 12 megapixels |
| Typical RAW size | about 10-14 MB |
| Released | 2020 |
| RAW options | 14-bit ARW RAW with lossless-compressed as the default option. |
Editing A7S III files with imagic
imagic opens .ARW files from the Sony A7S 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 10-14 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 Sony A7S III use?
The Sony A7S III writes ARW files with the .ARW extension. 14-bit ARW RAW with lossless-compressed as the default option.
How big are Sony A7S III RAW files?
Expect about 10-14 MB per frame from the 12 MP full-frame 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 Sony A7S III .ARW files for free?
imagic opens ARW files from the Sony A7S 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 ARW
The A7S III's .ARW files share their structure with every Sony body using ARW — the full ARW guide covers compression variants, free openers, and conversion options in depth.
Other Sony bodies
Cull a A7S III shoot before your coffee cools
AI quality scoring, duplicate grouping, and local batch processing for .ARW — free for 7 days, no card required.