The shutter count is the closest thing a camera has to an odometer. Every time you take a picture with the mechanical shutter, two thin curtains race across the sensor, and like any moving part they wear. Two bodies of the same model can look identical in a listing and have fired a few thousand times or a few hundred thousand. The count tells you which one you're looking at, so it's the first thing we ask a seller for. Here's how to read it on each brand, and what the number means once you have it.
What the rating means
Many makers publish a rated shutter life, the number of cycles their testing says the shutter lasts on average. Nikon rates the D750 at 150,000 and the D850 at 200,000. Canon rates the R5 at about 500,000. Olympus rates the E-M1 Mark III at 400,000. Each camera page here shows the rating where we found the maker's figure, and says so plainly where we didn't.
A rating isn't a limit. It's an average from testing, so many shutters run well past it and a few fail early. Read the count as a share of the rating. A body at a fifth of its rating has most of its life ahead of it. A body at or past its rating can keep going for years, but it's the one most likely to need a new shutter, and its price should say so. A replacement is a normal repair, not the end of a camera, so a high count is a reason to pay less rather than a reason to walk away.
Nikon: read it from any photo
Nikon makes this easy. Every Nikon in our catalog writes the count into the maker notes of each photo it takes, so you don't need the camera in hand. Ask the seller for an original JPEG or NEF copied straight off the card, then open it in a free reader like ExifTool, which shows a field called ShutterCount. A screenshot or a photo that's been through an editor or a website usually loses this data, so insist on the original file.
One catch. On bodies with an electronic shutter, ExifTool's documentation says Nikon's count includes both mechanical and electronic frames. On the Z6 II and Z7 II, or a D850 used a lot in silent live view, the number can overstate how much the mechanical shutter has done.
Pentax: also in the file
Pentax writes the count into each image's maker notes too, from the K10D onward, which covers the K-1, K-1 Mark II and K-3 Mark III. ExifTool reads it from an untouched JPEG, PEF or DNG. Two caveats from its documentation are worth knowing. The counter leaves out live view and video, and a service can reset it.
Sony: encrypted in the file
Sony also stores the count in each original JPEG or ARW, but encrypted. ExifTool decodes it for many recent bodies, including the A7 III, A7R III, A7R IV, A6400, A6600 and A7C. The free browser tool at shuttertool.com reads the same data from a file you drop in and also lists the A7 II and A7 IV. Its author warns that almost any image editor destroys the data, and that frames shot with the electronic shutter don't add to the count. So on a Sony, unlike a Nikon Z, a body used mostly in silent mode can read low even if it took a lot of pictures.
Fujifilm: an image count that can reset
Fujifilm doesn't show a shutter count in its menus, but each original JPEG or RAF carries an ImageCount field that ExifTool reads. Its documentation notes the count may reset to zero when new firmware is installed. A very low number on an older X-T3 or X-Pro3 might mean a lightly used camera, or a recent firmware update. Look at the wear in the photos and ask how the camera was used. Some websites read the same field and then quote their own estimate of shutter life. Those estimates aren't Fujifilm's. Of the bodies we cover, the only Fujifilm rating we found is the X-T4's 300,000 cycles.
Canon: only over USB
Canon is the awkward one. None of the Canons in our catalog shows the count in its menus, and the DSLRs don't write it into their image files, so a photo can't tell you. The count lives in the camera and has to be read over USB. EOSCount, which uses Canon's own software kit, reads it from older bodies including the 5D Mark II and 5D Mark III, and says newer cameras aren't supported. For the 5D Mark IV, 6D Mark II, 80D, 90D, 7D Mark II, R5 and R6, ask the seller to connect the camera to a current shutter-count app that lists the model and send you a screenshot.
Don't confuse the file number with the count. Canon's file names run IMG_0001 to IMG_9999 and then start again, so IMG_2041 says nothing about how many photos the camera has taken.
Olympus: a hidden menu
Olympus bodies don't write the count into their files. Owners read it from a hidden service screen. On the E-M1 Mark II, owners describe the route as the monitor brightness setting in the setup menu, then INFO, OK, Up, Down, Left, Right, the shutter button and Up. The mechanical count shows next to MS on the second page. This comes from owners' forums rather than Olympus, and we couldn't confirm the same sequence on the E-M1 Mark III or E-M5 Mark III, so ask the seller to try it and send a photo.
What to ask the seller
- On a Nikon, Pentax, Sony or Fujifilm, ask for one untouched photo file straight off the card, sent as a file rather than pasted into a message. You can read it yourself in a minute.
- On a Canon, ask for a screenshot of a USB shutter-count app with the camera connected.
- On an Olympus, ask for a photo of the service screen.
- If the seller won't or can't, price the camera as if the count were high, or move on. Plenty of sellers will.
Once you have the number, compare it with the rating on the camera's page and with the wear in the photos. A low count with worn paint and a shiny grip doesn't add up. A matching story, a fair count and a clean sensor is a camera worth buying. Our listing red flags guide covers the rest of what to check.
