A reproducible file check
Nikon D2H case study: a detected count of 4,350
One small NEF provides a useful demonstration of both the value and the limits of shutter-count metadata. Here is the exact sample, what our reader extracted, and how to repeat the check.
By ShutterActuations · Published September 15, 2026 · Corpus observation September 5, 2026
Nikon:ShutterCountThis is a documented file result, not a live analysis of your camera or an independently verified lifetime total.
The original sample
The file is D2H_3957.NEF, a Nikon D2H sample listed by raw.pixls.us as a color target and licensed CC0. It was contributed to that public collection; it was not photographed by ShutterActuations, and we did not inspect the camera body.
- Source record
- raw.pixls.us #5227
- File size
- 3,236,017 bytes, about 3.24 MB
- Source format
- 12-bit compressed Nikon NEF, according to the source catalog
- SHA-256 fingerprint
155edb938f884ea7372ce98d4ff5f965c3e413b43b95bc9923da6e92082cf914- Reader package
@uswriting/exiftool 1.0.9; this is the wrapper package version, not the embedded ExifTool version.- Recorded corpus application commit
ade8deab1cd63cf3201059330a3835c2d590f30c
Download the original from raw.pixls.us (external, about 3.24 MB). The download contacts that external site. Once saved, selecting the file in our checker processes it on your device. The source original may contain identifiers omitted from this article.
Repeat the check in your browser
- Download the original NEF using the source link. A renamed download is fine; editing or converting it changes the experiment.
- Optionally compare its SHA-256 fingerprint with the value above. This identifies the exact bytes used in our test. It does not authenticate the camera or the photographer.
- Open the ShutterActuations checker and select the saved NEF. Confirm the make and model identify Nikon D2H.
- Let the fast metadata scan finish. If no counter appears, choose Check shutter count. The optional reader downloads approximately 25.3 MB on a first uncached run; wait for its progress indicator to finish.
- Look for 4,350 and its exact source,
Nikon:ShutterCount. The metadata search can locate the original named field. - Record the displayed application version and browser if your result differs. Compare the original file hash before drawing a conclusion about the parser.
The same sample was used in the production v0.4.3 regression on September 5, 2026, with the same 4,350 result. Reproducing an extraction across software runs establishes repeatability; it does not supply an independent camera-service baseline.
Optional local fingerprint and ExifTool commands
In PowerShell, from the folder holding your downloaded file:
Get-FileHash -Algorithm SHA256 -LiteralPath './D2H_3957.NEF'If you already have the official desktop ExifTool, record its version and read only the selected fields:
exiftool -ver
exiftool -G1 -a -s -n -Make -Model -ShutterCount -ImageCount -DeletedImageCount D2H_3957.NEFThese commands read the file. A different ExifTool release can decode additional fields or change labels. Agreement between readers supports the extraction, not independent mechanical-count verification.
Three numbers, three field names
| Exact field | Recorded value | Interpretation |
|---|---|---|
Nikon:ShutterCount | 4,350 | The strongly named field displayed as the detected counter. |
Nikon:ImageCount | 2,488 | A separate image-related field. Do not replace ShutterCount with this number. |
Nikon:DeletedImageCount | 1,862 | Additional context retained in this research extract; not a production shutter-count mapping. |
Here, 2,488 + 1,862 equals 4,350. That arithmetic is an observation from one sample. It does not establish a universal Nikon formula, prove that deleted files always explain the difference, or justify calculating a missing shutter count from other fields.
The filename contains 3957, another different number. A filename can be renamed, reused, or reset. This is why the checker uses a named metadata field rather than guessing from the filename.
What this test establishes
- The selected file has a repeatably readable, strongly named Nikon shutter counter.
- The public checker accepts this NEF and can display the decoded value.
- The observed application flow keeps file analysis local and loads the deep reader only when requested.
What remains unknown
We have no service diagnostic for this body, no witnessed capture sequence, no repair history, and no physical serial-label photograph linked to the sample. We therefore classify the result as DETECTED. It cannot certify the total number of mechanical cycles, remaining shutter life, ownership, or condition. A success on this D2H file also does not prove compatibility with every D2H or Nikon original.
Use the method with a seller’s fresh file
A public test file helps you learn the interface, but it is not evidence about a camera offered for sale. Request a new photo of a neutral card carrying a code you just supplied. Ask for the original file and a separate picture of the body serial label. Compare the visual challenge, model, serial where available, source-tagged count, and service history.
Our worked buying example separates a real recorded file result from a hypothetical seller claim. That separation prevents a demonstration from being mistaken for an authenticated transaction.
If you cannot reproduce the result
Check the file fingerprint, accepted extension, completion state, and whether the optional download finished. A missing field after a successful scan differs from a reader that failed to start. Follow the missing-count troubleshooting guide and send a minimal report through Contact, without including private metadata.