I found a sale on ebay for this Canon FD 100mm f2.8 US Navy lens for some cheap price so I ordered it. Well, it's like they said a brand new Canon FD 100mm 1:2.8 lens, *but*... The aperture ring is locked!? But the more frustrating thing is that the focusing ring is either locked or non-existent ?!?! I can see maybe a fixed aperture lens, but I never considered a fixed focus FD lens.. I wonder if I should try to return it or maybe try to fix it?