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CMS-XML EF lens warranty information.
CMS-XML Information on the EF II extension tubes.
CMS-XML EF 400mm f/2.8L USM : How to use the Focus Shift?
CMS-XML EF 400mm f/2.8L: Here is a list of the parts and controls - Nomenclature?
CMS-XML How to locate the serial number on the lens
CMS-XML How to use the Circular Polarizing Filter PL-C.