Originally Posted by nickthetasmaniac
The optical construction of the M28/f3.5 (6 elements/6 groups) is different to both versions of the Takumar 28/f3.5 (7 elements/6 groups). The Taks are also much bigger lenses (58mm filter vs 49mm). None of these have a particularly good reputation (by Pentax standards), but I can't comment on image quality as I haven't used them.
Only the very first version of the Takumar 28/3.5 is the 7/6 formula with 58mm filter thread.
The 2nd version Super-Takumar and the Super-Multi-Coated Takumar version are both 7/7 with 49mm filter thread.
In my experience, the Super-Multi-Coated Takumar 28/3.5 is an excellent lens.
by Colton Allen
, on Flickr
Asahi Pentax SV
S-M-C Takumar 28/3.5
Kodak Ektar 100
Nikon Coolscan V ED