If I recall correctly: M42 50/1.4 = K 50/1.4 M 50/1.4 basically similar A 50/1.4 = F 50/1.4, and a slightly improved design than the previous
Other "K" lenses that appear to be M42 lenses in k-mount: 15/3.5 (although there are two versions of EACH, one asph and one not) 24/3.5? 35/3.5 35/2 85/1.8 105/2.8 (this design is REALLY old as Pentax glass goes) 135/2.5 135/3.5 200/4? 400/5.6 500/4.5 Apparently NOT 28/3.5, which is odd, as the M42 28/3.5 is a great lens. It's interesting to me that many of the lenses on this list are now the rare and desirable ones. I've got all of them in M42 and none of them in k-mount. DJE
