I have two Sakar 28mm lenses for Olympus OM mounts to sell. I bought a lot of three of them and only need one. The apertures are stuck open (at f2.8), but the lenses are pristine and can be used to take nice piggyback astrophotos. In order to use them during the day, you'd have to repair the shutter mechanism inside (probably needs a new spring), but they are fully functional for piggyback use as is; I've taken some nice picks with them. Rear cap and original box included. Thanks! $15 shipped, or trades for ?