It's really tough to follow Jurgen's 1957 Hasselblad SW with a CFV back....
My bit of gear is not exotic, expensive, old, rare or beautiful.....but for a Pentax 67 lens, it is not easy to find and is by all accounts, very good. I have looked for this lens, off and on, for a few years. Pretty much gave up looking last year, figuring my P67 lens collection was as complete as it was ever going to be. But after seeing another post on the Pentax MF Forum about this lens, I decided to check KEH once again. Couldn't believe my luck. They had TWO of them....I quickly put the EX+ lens in my cart and checked out. It arrived today. I only wish I had a Pentax 645D to put it on. Perhaps I will try it on the D800E instead and someday, when I'm really ambitious, on my Pentax 67.
Pentax 67, SMCP 100mm f4 macro