Commlite Manual Focus MF Lens Mount Aadpter with Aperture Dial for Nikon G, DX, F, AI, S, D Type Lens to Sony E-mount Nex Camera A7, A7R, NEX-3, NEX-5, NEX-5N, NEX-7, NEX-7N, NEX-C3 NEX-VG10, VG20, FS-100, FS-700 8 stops Exact Aperture dial Widely used for Nikon lens of G/F/AI/S/D type Manual focus, can reach infinity focus Increase MTF Special paint of aperture hole to minimizes internal reflections