This is a set of three adapters: the Voigtlander VM-E CLOSE FOCUS ADAPTER, and the SC→VM ADAPTER (for S-mount) and (for C-mount). This combination allows you to use LEICA M-mount, Nikon S-mount, and CONTAX C-mount lenses on Sony E-mount cameras. It also has a focus function, allowing for a shorter minimum focusing distance. I purchased these new and have kept them in storage without using them. Please refrain from purchasing if you will take many days to confirm receipt.