Originally posted by Amish DMV Pentax -m 1.2 50mm. Is any this kind of lenses as someone online wants to sell
Welcome to Pentax Forums. Do you mean "SMC" rather than "DMV"? Also, there was no f1.2 50mm lens made in the Pentax M series, which I assume is what you mean by "Pentax -m".
Putting all that together, I suspect that what you're looking at is a Pentax-M 1:2 50mm, ie a 50mm f2 M-series Pentax lens, which should be fairly inexpensive to buy. If so, it is a manual focus, auto aperture lens on Pentax film cameras, but manual aperture on a Pentax DSLR. The Pentax 50mm f1.2 lenses were only made in the K and A series. Have a look on the Forum information on Pentax lenses
here.