A replacement rather than an acquisition, for my F-mounts.
I had a very good Vivitar 28mm MC Close Focus Wide Angle f/2.8 - built by Komine. OK, of somewhat less mechanical quality than the "big" names but optically remarkably good and extraordinary small. And relatively very "cheap".
Last time I used it, I managed to scratch the rear element (don't believe Larry Niven when he writes that the utterly self-confident way of moving is an indication of age
)
To me it feels that the rate of becoming more clumsy is exponential to the rate of aging
I started looking for a replacement. No such lenses to be found unfortunately. These are pretty old and probably even when they were new not well enough appreciated by their owners.
Probably often even simply disposed of.
Tip for those interested: keep an eye open for this lens. Be careful though: the number of variants of this lens produced, is staggering. That's why I wrote the full name.
So, I looked a the new Voigtländer 28mm SLII-s, 2nd hand Zeiss 28mm ZF.2, Nikkor Ai-S 28mm f/2.8 and f/2.0 2nd hand obviously.
Since the Zeiss is a really specialty lens and I saw the Voigtländer being trumped by the Nikkor Ai-S 2.8 - at least on the parameters that are important to me, it boiled down to a choice between Nikkor 2.8 and 2.0.
I decided on the f/2.0 since the "common experience" indicates this one is ever so slightly better at long distances, both stopped down of course.
I found a clean copy and that's on its way now - already passed our customs.