![]() Make sure the buttons are still firm and function. This is why I'd advise buying locally rather than over ebay or similar. If you are getting a camera at a good deal, and are able to put $200 in a savings account for if/when the shutter fails, you'll be in good shape.īeyond the shutter, everything else you should be able to see with a bit of a "test drive". But it gives you an idea of what the possibilities are. Looking at actual self-reported values at - sorry, nothing for the Mark III, but the Mark II had the same rated MTBF of 150,000 actuations - we see a 66% chance of a shutter living beyond 1 million actuations (!) Of course, this is all self-reported, and those who get up to 1M actuations are likely treating their cameras differently than those who just hit 100k actuations nine years after release. 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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