This is brand new Kipon adapter. Fit contax G mount lens (there have many high quality Contax G lens， which you can use in new sony NEX mount adapter)， It is advanced model which have large focusing ring， you can easily to focus and more accurate. You can use the lens in Manual or Av mode， Av model still have metering.                                    Features            New and high qualityThis is Kipon Contax CY toSony Alpha NEX-5 / NEX-3 camera Mountlens mount adapter ringIt is with a large diameter focusing ring， providing a quick and accurate focusingIt supports infinity focusMade by high quality metalSome of camera， needsetyourcamerain ′ SHOT WITHOUT LENS ′ mode                                                                                                Package Includes            1 x Kipon Contax to Sony NEX Mount Adapter<br>                                                            Extra Info            CompatibilityBiogon T* 21mm/f2.8<br>Biogon T* 28mm/f2.8<br>Planar T* 35mm/F2<br>Planar T* 45mm/F2<br>Sonnar T* 90mm/F2.8<br>Vario-Sonnar T* 35-70MM<br>