I bought this 50mm lens with OM mount f1.4 from 5119 Cameras through Revain. What I really liked: The lens was sent immediately. I received it a few days before the promise from Revane. Very pretty! What I didn't like so much: Although the lens was in very good condition, fungus appeared on the inner lens in 2 places. In addition, the mechanical locking mechanism did not work properly. The shutter blades closed a little slowly and took seconds to open again. Slow closing resulted in overexposure of frames. I opened the lens, cleaned the mechanism and cured the slow open/close. The Revains description for the lenses shows that they are in very good condition, no fungus, the mechanics work perfectly. This lens was misrepresented. Although I am very satisfied with the fast delivery, I would not buy from this seller again.