Drop an ARW file from your Sony A7 III (ILCE-7M3) and get the exact mechanical shutter actuation count in seconds — processed entirely in your browser, never uploaded anywhere.
Check Shutter Count →The Sony A7 III (ILCE-7M3), released in 2018, was a watershed moment in full-frame mirrorless cameras. Its combination of 24.2 MP back-illuminated full-frame sensor, 693-point phase-detect autofocus, 10fps burst, and 5-axis in-body image stabilisation at its price point made it the best-selling full-frame mirrorless camera for several years running. The mechanical shutter is rated at 200,000 actuations.
Because the A7 III sold in enormous numbers, it has one of the largest and most active used camera markets in the world. Shutter count verification is more important on the A7 III than almost any other camera — many units with heavy use are sold without disclosure.
| Model | Release | Sensor | Rated Shutter Life | ARW Offset |
|---|---|---|---|---|
| Sony A7 III (ILCE-7M3) | 2018 | 24.2 MP full-frame BSI | 200,000 | 0x003a |
| Sony A7 IV (ILCE-7M4) | 2021 | 33 MP full-frame BSI | 300,000 | 0x003a |
| Sony A7C (ILCE-7C) | 2020 | 24.2 MP full-frame BSI (same sensor) | 200,000 | 0x003a |
Ensure the photo was taken with the mechanical shutter, not the silent / electronic shutter mode. Electronic shutter frames do not increment the mechanical counter and will give a misleadingly low count.
| Shutter Count | % of Rated Life | Assessment |
|---|---|---|
| 0 – 10,000 | < 5 % | Lightly used — excellent condition |
| 10,000 – 60,000 | 5 – 30 % | Normal use — inspect for cosmetic wear |
| 60,000 – 120,000 | 30 – 60 % | Moderate to heavy use |
| 120,000 – 180,000 | 60 – 90 % | Heavy use — shutter replacement likely needed soon |
| 180,000 + | 90 %+ | Near or past rated life — significant risk |
Sony shutter replacement on the A7 III typically costs €200–350 at an authorised service centre. Budget for this if buying a unit with over 100,000 actuations.
The Sony A7 III stores its mechanical shutter count encrypted in ARW MakerNote tag 0x9050. ShutterCount applies Sony's cubic residue decryption algorithm (modulo 249) and reads the count from byte offset 0x003a within the decrypted block. This is the same offset used by all Sony full-frame cameras from the A7 III generation through to the A9 III and A1. All decryption is performed locally in your browser — no file data is ever transmitted.
Shoot a mechanical ARW frame and drop it into shuttercount.app. The count is decrypted from tag 0x9050 at offset 0x003a in your browser, instantly and privately.
Sony rates the A7 III at 200,000 actuations. The A7 IV that replaced it has a 300,000-actuation shutter — 50% longer rated life.
Yes, for stills photography. The 24.2MP BSI sensor, 5-axis IBIS, and 10fps burst still hold up well. The autofocus has been outpaced by newer bodies (the A7 IV, for instance, has dramatically better subject tracking), and 4K video is limited to 8-bit colour and a cropped field of view. For photographers prioritising image quality over video and autofocus, a well-priced A7 III remains competitive. Check the shutter count carefully.
Only Sony authorised service centres can reset the hardware counter. Always verify from an original ARW file, not a screenshot, JPEG, or listing photo.
The A7 III has a silent shooting mode that uses an electronic shutter to read the sensor without moving any parts. Electronic shutter frames do not increment the mechanical shutter counter. However, the A7 III's non-stacked sensor is susceptible to rolling shutter distortion in electronic mode — use mechanical shutter for any fast action or flash work.