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lens fault?

sigma lens to canon dslr camera.
showing on screen, err. 01 comunication between the
canera and the lens is faulty clean the contacts.
ernest james foxcroft, October 2011
Some earlier Sigma lens need to be re-chipped by the factory to solve this problem

nigel, October 2011
and have you ?

mech monster, October 2011
link Click here to see other fixes for Canon.