So, if the shutter has outlasted the initial manufacturer's warranty, it is likely to get much more than 150,000 actuations. These numbers are generally lower than what an individual should expect, however, because there is a spike in shutter failures in the low-thousands (due to clear manufacturing defects), and then a fairly long narrow tail beyond that. The mean means that as many shutters that Canon produces will fail before 150,000 actuations as fail after 150,000. Now, this doesn't mean that a shutter will "on average" live to only 150,000 actuations. The Canon rating for Mean Actuations Before Failure of its 5DMkIII is 150,000 actuations.
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