PLEASE NOTE; We are NOT responsible for lenses you buy from us that vignette, don't fit, have focus issues, or any other problems adapting to modern digital cameras like Black Magic, or 4/3 or any other camera that they were not designed for. We do not take returns, or give partial refunds for any adapting reason. Please be fair to us and don't turn on us because a lens doesn't adapt. YOU MUST DO RESEARCH AND EXPERIMENT. It is not our fault if it doesn't work. The best thing is to buy a lens that IS designed for your camera. I wrote this because many people are getting nasty and abusive to us, and forcing us to take returns through cases because they don't know what they are doing or how to adapt. Moreover, they make a mistake and won't take responsibility for it and turn on us because it's the easy way out. You can always RESELL the lens. Thank you, Rudi CALKOVSKY--Owner