Unfortunately one of my favorite 55mm lenses has been acting up recently. The DOF "slide" on the inside ring of the lens appears to be loose (it will freely float back and forth just from gravity) and when I lock the lens into place on the FE2 I use with it, something happens where when I release the shutter it appears to trip up and will not take the foto (you will see a blurry, dark image if you look through the lens at this point). There is no way to free the shutter except to remove the lens. The moment I remove the lens the shutter frees and an unwanted picture is taken. I'm guessing this has to do with the DOF slide because there's really nothing left to be broken (that I can tell, at least). The DOF preview on the FE2 also won't work. Occasionally if I press it many many MANY times it will give me a slight preview or stick in preview mode. So I guess I'm wondering if this is something that I can fix. Seems like maybe there's a spring in the lens that broke or came unhinged. The lens isn't cheap and it's my favorite 35mm macro. Thanks! P.S. All my others lenses including very old Nikkor lenses all work fine.