Drop an ARW file from your Sony A7R III (ILCE-7RM3) and get the exact mechanical shutter actuation count in seconds — processed entirely in your browser, never uploaded anywhere.
Check Shutter Count →The Sony A7R III (ILCE-7RM3), released in 2017, was a landmark camera in Sony's high-resolution lineup. It combined the 42.4 MP BSI sensor of the A7R II with a completely redesigned body featuring dual SD card slots, 10fps burst, significantly improved battery life (via the larger NP-FZ100 battery), and a higher-resolution EVF. The mechanical shutter is rated at 500,000 actuations — Sony's highest tier, appropriate for a camera designed for exacting studio and landscape work.
| Model | Release | Sensor | Rated Shutter | ARW Offset |
|---|---|---|---|---|
| Sony A7R III (ILCE-7RM3) | 2017 | 42.4 MP full-frame BSI | 500,000 | 0x003a |
| Sony A7R IV (ILCE-7RM4) | 2019 | 61 MP full-frame BSI | 500,000 | 0x003a |
| Sony A7R V (ILCE-7RM5) | 2022 | 61 MP full-frame BSI (same as IV) | 500,000 | 0x003a |
| Shutter Count | % of Rated Life | Assessment |
|---|---|---|
| 0 – 20,000 | < 4 % | Lightly used |
| 20,000 – 100,000 | 4 – 20 % | Normal use for age |
| 100,000 – 250,000 | 20 – 50 % | Moderate — inspect carefully |
| 250,000 – 450,000 | 50 – 90 % | Heavy professional use |
| 450,000 + | 90 %+ | Near or past rated life |
The Sony A7R III stores its mechanical shutter count encrypted in ARW MakerNote tag 0x9050. ShutterCount applies Sony's cubic residue decryption (modulo 249) and reads the count from byte offset 0x003a. All decryption is performed locally in your browser.
Shoot a mechanical ARW frame and drop it into shuttercount.app. The count is decrypted from tag 0x9050 at offset 0x003a in your browser.
Sony rates the A7R III at 500,000 actuations — the same as the A7R IV and A7R V that succeeded it.
Yes — for studio, landscape, and commercial photographers who don't need 61MP. The 42.4 MP sensor delivers extraordinary detail and dynamic range, the 500k shutter means used units still have plenty of life, and used prices are now very attractive. The main limitation vs the A7R IV is the lower-resolution EVF and slightly older AF system. Image quality at base ISO is essentially identical to the A7R IV.
Only Sony authorised service centres can reset the hardware counter. Always verify from an original ARW file, not a screenshot.