Keith, I have seen a K 50mm f1.2 and an A 50mm f1.2, but I don't think there ever was an M 50mm f1.2. The M lenses have a 49mm front element as a rule across the series. The K and A both have 52mm front elements, and they use all the space! They never made a 50mm f1.2 with a 49mm front filter size.
Regards, Bob S. [EMAIL PROTECTED] writes: << The A50mm f/1.2 is currently manufactured, but without looking, I don't know if Pentax made an M50mm f/1.2. Who knows? Wait a minute, I have a small, 60-page brochure on "Asahi Pentax Lenses and Accessories" by Pentax, published in 1971 I believe, indicating they did indeed make a "SMC Pentax 50mm f/1.2" 7 elements, 6 groups. >>
