Found this at the thrift store, and thought it would be fun to try on my GF1. The lens is in near perfect condition, but the leatherette case is shedding it's velour interior all over hence the dusty/scratchy appearance. So, if I figure out what adapter to get for this, is it worth the trouble? I'm seeing mixed reviews on this lens. A guy at the local camera shop didn't recognize this. After looking around online, I'm thinking it might be a Minolta MC/MD mount, based on the little notch in one of the flanges. This mount spins off to reveal some threads that seem to be the same size, but smaller thread pitch than an M42. The adapter mount is labeled "JAPAN" and "TA5".