Just to add to the already posted answers... The mechanical dimensions of the Pentax 50mm f1.4 lenses changed from screw mount to K-mount. In general, they changed with each additional release of a new version, K mount or M or A or F or FA mount. I don't know if the glass lens elements stayed the same, but I seriously doubt it. The minor changes in the external dimensions made this unlikely.
For interchangable parts, I would guess that the 50mm f1.4 Super Takumar and 50mm f1.4 SMC Takumar are about the closest matching lenses. In those two screw mounts, it looks as if the parts might be interchangable and the only change was the SMC coatings. Regards, Bob S. On Thu, 30 Dec 2004 00:34:39 -0600, Rebekah Gonzalez <[EMAIL PROTECTED]> wrote: > okie dokie, say i have two lenses, both are made by pentax, both are 50mm > 1.4, one is screw mount and the other is k mount. > hypothetical situation in place, is there any difference other than the > shape of the mount? > > rg2
