[ Thanks to Dmitri
Popov for this link. ]
“The life expectancy of a DSLR camera is usually
measured in shutter actuations. For example, Nikon D5000 is good
for about 100,000 shutter clicks. That doesn’t mean that your
camera dies the day it exceeds its shutter actuation limit, but the
shutter count provides a good indication of the camera’s condition.“While none of the major camera manufacturers provide an
in-camera feature for checking the shutter count value, you can use
digiKam to do that.”