Terrific value for the money. I purchased both the Jupiter 12 and the M adapter. I use them on my M2. Superb results. I have difficulty telling the B&W shots of this lens from my Summicron images. My "shot of the year" in 2003 was a company class picture taken with thisl lens at wide open indoors at 1/30. I was very proud of my steadiness and amazed at the sharpness. My only issue with this lens is remembering that the distances are meters. I found an aftermarket long M rear cap that fits the lens with the adapter on, and still fits into the Jupiter case.
Rating: [5 of 5 Stars!]