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Author Message   Berndtotto Tinkerer Username: Berndtotto Post Number: 7 Registered: 03-2011 Rating: N/A Votes: 0 Posted on Thursday, June 09, 2011 - 09:20 am:    I think, all Canon FD/FL type lenses do have some kind of lever on the back side ( the side, which is facing the camera ). You can hold it aside with your hand and the blades should move, when moving the aperture ring. If that works, the lens is okay and hasn't just been properly mounted to the camera, which can often happen, especially when using adapters. Repairshop ? That might probably not be worthy. Canon FD f1.4 50 mm lenses are one of the cheapest available. Hope, that it is not broken. Good luck !!!