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Message: <blockquote data-quote="Malcolm Stewart" data-source="post: 1430420" data-attributes="member: 6851">My 1D MkIII had its sub-mirror fix done in Jan 2008, shortly before I bought it.  I've registered it on the Canon website, and am dropping it off at Canon, Elstree next week.  So far, everything has been done with this recall/adjustment/fix(?) very professionally.I have found it very difficult to decide whether some of my poor results is simply my lack of experience, or down to poorly working equipment.  If only there was an easily repeatable and standardised AF test set up life would be much easier.  Living close to the M1, I have tried shooting vehicles approaching at ~65mph, but tree branches have grown by the bridge I used, and I can no longer "see" the M1 at the angle which I used two/three years ago, so adding yet another variable!  The other massive variable is the detail/lack of detail in motorway targets - the worst being modern coaches with their huge windows, and low contrast interiors.  Sometimes the AF never latched.  The best are scruffy lorries where there's plenty of detail for the AF to latch on to!The point I'm trying to make is that when I do get my camera back, I doubt whether I'll quickly know for sure whether there's a real improvement.</blockquote>