just looking at the number of files on my timelapse hard drive, i'd say i'm over 100k on one of my 5DmkII bodies.
i have a theory that bulb exposures are less taxing on the shutter than say 1/500 in the studio, but no evidence to back that up (yet).
it is also possible to replace the shutter.. it's not a cheap fix but much less than the cost of a new camera. so not completely the end of the world even when it does eventually happen. i'm not going to worry about it till it happens the first time..
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