Ok, I've purchased an M 50/1.7 and a mystery lens.
I paid a bit more for it than I probably should have (60$ after shipping), but the lister said it came with two lenses and described one of them as a "Sears 49mm PL". In the photo you see two lenses, about the same size, one is obviously the 50/1.7, and the other one is a little larger, but the lens area is completely dark and you can't see anything.
I racked my brains trying to figure out what kind of lens a Sears 49mm PL would be, and it finally dawned on me: he was reading what was written on the 49mm polarizing filter on the front of the lens, not the actual lens itself.
So, I figure, for an extra $20, why not take a shot and see what the other lens is? Maybe it's some junk lens, or maybe it's a nice 28mm. Who knows. It looks wide-angle-ish behind that dark mask. It looks like a piece of the lens is missing from the front, too. I thought maybe it was a teleconverter, but what kind of teleconverter takes 49mm polarizers and has what looks like f-stop writing on the side?
Anyway, next lens up is to find a good 35mm. I'd love to snag a 2.0, but they look really expensive.
I am also on the hunt for a decent ~50mm medium format lens to turn into a cheap DIY tilt, or perhaps I'll shell out for a nice eBay tilt adapter.
Total spent so far: $75 on lenses, $1950 on a new camera body. (Yikes!)
Right: 50mm/1.7, Left: A Sears 49mm PL?