Canon warns of defective focusing in some EF 24-105mm F4L IS II lenses

Canon has issued a service notice for a collection of lenses with specific serial numbers that need to be checked for faulty focusing systems. The lens affected is the EF 24-105mm F4L IS II USM standard zoom, but users are advised that only particular production batches have the problem. Canon says that some units with serial numbers beginning with 48, 49, 50 or 51 suffer from poor focusing when used with an AF point close to the edges of the host camera's focusing array. The fault is only appar...