Does the Canon 1.4 III Extender use a REAR lens cap that is different than those that fit all of their lenses?
For the life of me, all of my Canon lens caps I've tried do not fit. I'm thinking that when I sold my 5DII body I put that extender rear cap on it, which fit, but not vice-versa...or maybe I just lost it... Aaaarrgghh!





