Upon further contemplation, another issue that I think affects the value of the 1DmkIII is the number of these that have been reported to have AF issues. Many of us own models that don't seem to have this problem. One would think that if we have one that isn't, it should be worth more money (if you can prove that it doesn't). But, the over all reputation of this camera for many was that it does have AF issues, and the market reflects this perception by depressing it's value. From what I can see, I'd probably do well to sell my camera today for $1000. Not much more than a used 7D. About 1/3rd a mkIV or 5DmkIII. That is a very depressed value for the camera, which to my mind makes it one of the best values on the used camera market. If you are looking to buy the best camera you can for $1k or less, I can't think of a better one than the 1DmkIII. As an owner of one, that makes me unwilling to part with mine, it's cheaper to keep her.
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