This Lens Adapter V2 from Fotodiox enables the use of your M42 lenses on Nikon F-mount DSLR cameras. This adapter's design features an enlarged lip, or flange, that presses against the aperture pin of M42 lenses in order to facilitate manual adjustment of the aperture ring during use. As a fully manual adapter, stop-down metering is required, and infinity focus is limited based on the specific lens in use. Additionally, this adapter is constructed from lightweight, durable anodized aluminum.