Good morning, Greenbank;
Yes, I am also convinced that it was the big antennas in our Greenbank and Sugar Grove locations that put this madness into my head. Yes, sort of one of those "Forgive me, Father, for I have sinned." kind of things. Let's just say that my photographic equipment inventory list is now well over 100 pages long. And you do have one of those big antennas not too far away from you up near the Midlands at Jodrell Bank by Manchester. I often talk with a fellow who used to run it. We successfully enticed him to come over here and run our Sugar Grove installation for a while.
So far I have only two Asahi-Pentax Spotmatics; a real Asahi-Pentax Spotmatic SP, and a Honeywell-Pentax Spotmatic. But I have not been as self-controlled as you have demonstrated with lenses. For example, I go out to the Asahi Opt. Co TAKUMAR SMC 500mm f:4.5 for my longest lens for them, and I go down to a 24mm f:2.8 for the shortest wide angle lens. A 28mm lens really is a useful lens. It does come in handy for outdoors and landscapes. 24mm is about the shortest that I like to use. Anything less, and I really need to start remembering that I am using a wide angle lens, and I need to watch the horizon and where any lines are, and watch to see that they are still straight. With a 24mm lens, I can just about use it like a "normal" lens, and it is much more pleasant to use, and I like how well it works for interior room shots.
That 500mm lens? I needed something to use as a standard against which to compare a collection of 500mm f:8 catadioptric or mirror lenses I was testing.
Have fun with your Spotmatic, and remember, there are all kinds of M42 mount lenses out there that will screw right onto it.
Enjoy; Ralph, Latte Land, Washington