Happy New Year...
Well, just to keep everyone posted on my progress and what I have found so far. Hopefully, this can assist any beginners like me.
1) found exactly which lens this is, which is a Asahi part no# 37902, made for only a couple years 1971-1972, so this is really "limited" in those days. Very helpful website Asahi optical historical club. Cleared up alot of confusion as to which lens it is, chronology, super tak vs s-m-c vs smc, etc....
2) Ordered an OEM Pentax mount adaptor k through Cr Kennedy in Australia, approx $45. Waiting for it to arrive.
3) Bought a black light from the hardware store and after 2 days of exposing the rear element to it with the foils and a homemade foiled lined tissue box, some noticeable differences, the yellowing is clearing up.
Another thing i did noticed whilst trawlling thru the web, that i could unscrew the rear element (focus to infinity to bring the rear element out and gently grip the ring around the lens, unscrew counter clockwise), that's when i noticed the rear element was not yellowing or not that yellow compared to the second lens from the rear. So with all the discussions around it being the rear element, well at least with my s-m-c tak, it's the 2nd from the rear.
4) Dad's spotmatic 2, is in mint condition, and when i get confident in photography, i will give it a shot. Cannot get my head around not being able to veiw the immediate results of a shot like any modern camera can. ( note to oneself, why not carry both??
)
Cheers to all.
Ken