Most of the apps do not work. Some work by altering the camera firmware, which is not a good thing. The best method is to send the camera body to Canon for a cleaning, and ask for a count.
I have sold a couple of used bodies, and have found shutter count to have dubious value. It is a can of worms that is best left closed, IMHO. Here’s why. It starts a series of questions that do not have good answers.
Once you tell someone that count the next questions are: “how did you get it”, “when was it taken”, “do you have it in writing”. The worst question of them all is “how many shots have been taken since the count was recorded.”
If someone asks me for a shutter count on a used camera, I raise the price. I tell them that the increase is to cover the cost of sending it to Canon, which is the truth. If that is unacceptable to them, too bad. If you want a documented shutter count, then you have to pay for it. I’m not.
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"Fooling computers since 1972."
