# What a shutter count does and doesn’t tell you about a used camera

> Source: https://caminfolab.nl/guides/what-shutter-count-tells-you
> A shutter count is useful when buying or selling a used camera, but it isn’t a health check. Here is how to read the number, why rated shutter life is not a countdown, and what else to inspect.
> Last updated: 2026-10-02

A shutter count is the number of times the camera says its shutter has fired. It is one of the few objective numbers you can get from a used camera, so buyers ask for it and sellers quote it. It is also easy to read too much into.

## What it tells you

- **Roughly how much the camera has been used.** A count of 4,000 and a count of 140,000 describe very different histories.
- **Whether a seller’s description fits.** “Barely used” and a six-figure count don’t match, and that is worth asking about.
- **A baseline.** Reading it when you buy gives you a starting point if you later need to judge how much you’ve used it.

## What it doesn’t tell you

- **How much life the shutter has left.** Manufacturers publish shutter durability ratings for many models, but those are test averages under controlled conditions. Some shutters fail well before the rating; many run far past it. The rating is not a countdown.
- **The camera’s condition.** The count says nothing about sensor dust, dead or hot pixels, worn buttons, a scratched screen, a loose lens mount, moisture damage or a dropped body.
- **Whether parts were replaced.** A replaced shutter may come with a reset counter or keep the old one. A low count on an old camera isn’t automatically suspicious, and a high count on a recently serviced camera isn’t automatically bad.
- **That the number is untouched.** The value comes from the camera’s firmware. A reading taken in front of you, with the camera you are buying, is far more meaningful than a screenshot.

## How to use the number well

1. **Read it yourself if you can,** with the camera you’re actually getting. CamInfoLab’s [shutter count checker](https://caminfolab.nl/) shows the time of the reading and where the number came from, and you can copy that to keep.
2. **Compare it with the camera’s age and the seller’s story.** Big mismatches deserve a polite question, not an accusation.
3. **Inspect the rest of the camera.** Take a few photos of a plain bright surface at a small aperture to look for dust, a long exposure with the lens cap on to look for bright pixels, and check every button, dial, port and the lens mount.
4. **Ask about service history.** Shutter replacements, sensor cleaning and repairs are worth knowing about, and receipts are better than recollections.

## Would a guided inspection help?

We are considering a free, browser-based inspection checklist that combines a shutter count reading with local photo checks for dust and bright pixels, with every finding labelled by where it came from. It isn’t built yet. If it would help you, [tell us what you’d want from it](https://caminfolab.nl/faq#more-tools).