<p>Hi all - I ran a roll of film the other day for the first time in about 5 years in my AE-1. I have a few lenses in various states of repair, but one I hoped would work was an Osawa 80-205mm f/4.5. However, when I hit the shutter button, I hear the mirror go up but then nothing happens. Mirror stays up until I unscrew the lens to remove it, then it goes through the normal process - shutter open/close, mirror comes back down. At first I thought the mirror was being blocked but I don't think that is the case. The lens looks fine. The problem happens at all apertures including AE and all zoom levels.<br> My thinking is that the aperture mechanism is stuck after years of no use. I think I paid $40 or $50 for this lens eleven years ago, and I don't think it is worth sending to a shop. Any advice on DIY repair or "oh just do this" is appreciated.<br> I'll send another note later about my beautiful 135mm f/2.5 with broken focuser :)</p>