If you have a lens that can be rechipped and have the original receipt that shows you bought it new then Sigma will not charge you. Have had this done twice, once when I upgraded from an EOS 100 (film) to an EOS 3 (film) and then again to a 20D. The 18mm wide angle I had could not be rechipped the second time as was no longer current and they had no stock. I suppose other independant makes have the same problems? All very annoying though as it means an expensive Sigma lens may eventualy become redundant as new models are introduced. Canon obviously like this situation as they hope it will make you buy only their lenses which are always backward compatible.
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