Originally posted by jjhenders PS. Can anyone tell me what a Super Tak is? I know it must be a lens made by a company called Takumar, but I sure have never heard of Super Tak. I've seen some shots on this site taken with Super Tak lenses and they look really good.
It's just shorthand for Super-Takumar. Asahi Optical Co. made lenses with the Takumar brand name and cameras branded Pentax. Various series of Takumars include Super, Super-Multi-Coated and SMC, which broadly describe the lens coatings. Most lenses with those names have similar features, mostly irrelevant to using them on a DSLR. Some older specialty lenses have different names like Tele, Macro or Fish-Eye. There are older series called Auto, and lenses meant for Pentax 6x7 cameras with 6x7 in the name.
I'm skipping a lot of fussy details here, but basically Super-Takumars have simpler lens coatings than Super-Multi-Coating or SMC lenses. It's hard to be exact because coating technology was being improved constantly. Early lenses might have one layer, and later lenses three or more. The coatings make a subtle difference in color and contrast, and are less resistant to flare than later lenses.
Asahi tried and often succeeded in making these lenses the finest available at the time, in both optics and build. You can pick up one of these 50 year old lenses that's well-used, and it is very rare for it to not work great. If someone was making these lenses the same way today, they'd all have 4-figure price tags.
In the mid-70s, they began to make Pentax-branded lenses, which all have the K-mpunt. The Takumar brand was used on some budget lenses afterwards. Some bonehead decided that, because these lenses used cheaper coatings.