Boz Dimitrov has this diagram onf the SMC-K 35mm f2 on his excellent site:
Originally Posted by aldevo
Is that some use to you?
As far as I know this eight element in seven groups design is the same as that of the later type of the Takumar (the one with the 49mm filter thread, the earlier version was huge, 67mm from memory).
The design changed radically for the SMC-M:
and this version of the design was kept for the SMC-A.
The current FA-AL version is different again, and though this looks like a simpler design (aspherical element aside) it is said to be an improvement on the SMC-K 35/2 and perhaps even on the K 35/3.5 - I must try one one day...:
I have both versions of the Takumar, and both are indeed really nice lenses, though I don't really use them now.