How to Check the Hidden Shutter Count on a Sony A7M4

Can this page tell you the A7M4’s lifetime shutter count?

ExifCheck does not currently provide a verified Sony A7M4 shutter-count decoder. It can inspect readable photo metadata, but displaying a MakerNote block is not the same as decoding a mechanical actuation counter. This guide is a checking workflow, not a report based on an original A7M4 test sample.

Use the browser tool to inspect a camera-original JPEG. ARW processing is not a verified workflow in this web tool; keep the original ARW for a local metadata reader instead.

Inspect an original JPEG

Check the file before interpreting a number

1. Copy a JPEG directly from the memory card and keep the original unchanged. Do not use a screenshot or a messenger preview.
2. Open the viewer and inspect the camera fields. For an A7M4, check whether Model records ILCE-7M4; metadata is editable, so this alone does not authenticate the camera.
3. Inspect all available fields and export JSON. Retain the filename and tool version with any result you want to compare later.
4. If MakerNote is just a long list of numbers, do not treat those bytes as a shutter count.
5. If a counter is missing, record the result as unknown, not zero.

A7M4 field interpretation

Field	What to check	What it cannot establish
Model	Whether the recorded model matches ILCE-7M4	Authenticity or ownership
SerialNumber	Whether a serial is present; redact it before sharing	A tamper-proof link to a body
ExposureTime / ShutterSpeedValue	Exposure duration or shutter-speed value	Lifetime shutter actuations
DateTimeOriginal	The recorded camera time	An independently verified timeline
MakerNote	Whether vendor data is returned, decoded or raw	A count merely because the block exists
ImageCount / ShutterCount	Exact tag, group and model-specific definition	That every counter measures mechanical wear
Software	Firmware or software identification, when recorded	Proof of editing or proof that other tags were removed

Local follow-up with ExifTool

After installing ExifTool, run this read-only command on your own original file. Replace the example filename with the actual path:

exiftool -a -G1 -s "DSC00001.JPG"

For an original ARW, substitute its filename. The options retain duplicate tags, show their groups and use tag names. No assignment or deletion option is included.

Search the output for count-related tags, but check their definitions in the Sony tag reference before interpreting a value. A field documented for another Sony model is not evidence of A7M4 compatibility. If there is no documented applicable counter, this workflow has not established the lifetime count.

When buying a used body

Ask for a fresh camera-original photo and keep its provenance with the result. A filename such as DSC09999.JPG is not a lifetime counter. Even a readable counter does not replace inspection of the camera’s condition and service history. Do not estimate remaining shutter life from an unexplained number.

Scope and references

The browser tool currently uses exifr for metadata parsing, without an A7M4-specific shutter decoder. The local command follows the ExifTool reading documentation. No real A7M4 sample result is claimed here.