I loved shooting with this lens.  A year ago, I got the dreaded Error 01.  It is not the connecting points and is almost certainly the diaphram that needs to be replaced.  It will work for many focal lengths but will all of a sudden disconnect.  Needless to say, it needs to be sent back for repair which is why the selling cost is so low.  I upgraded to the 24-70 and was intending to send this back but have decided to just sell is "AS IS".  Otherwise it is clean.  No mold or other issues except there is also no hood.  I cracked that right after I bought it.  You do get the original box.