Fotasy M42 Screw Mount lens to Sony Minolta DSLR Camera adapter Ring, for Sony Alpha a99 a900 a850 a700 a77 a65 a58 a55 a35 a33 a580 a390 a380 a350 a330 a300 a290 a230 a200 a100 The ring allows M42 Screw Mount lenses (Carl Zeiss, Pentax, Praktica, Mamiya) to be used on Sony Alpha Digital cameras (film SLR and digital SLR) The adapter is brand new , and made of brass copper The lens is set manually It is possible to use Macro rings and other accessories For Sony Alpha a99 a900 a850 a700 a77 a65 a58 a55 a35 a33 a580 a390 a380 a350 a330 a300 a290 a230 a200 a100