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SMC Pentax 85mm f/2.2 Soft.
I have never heard of that how is it "soft"?
It's a unique lens. This is my second copy. For some inexplicable reason, I sold my first one in 2010. This current thread where I posted some old example photos rekindled my interest,
It has only two elements, arranged as a single group that forms the "front element". There's lots of empty space inside. In fact, you can mount an EF Extender or Pentax "long" TC to it.
Boz Dimitrov's Pentax K-mount site has an excellent description,
Stan Halpin's site also describes it, but the comments on his current site are truncated to only a few words,
Here's the full version of the discussion that I saved some years ago,
85mm f/2.2 (soft)
Gerald Cermak - I've got one of these lenses, and for portraits it is nice. The aperature settings, while performing the indicated light changes, also change the amount of softness. That is the meaning of the scale. At 2.2, the maximum softness occurs, with less softening in the center than the outer portions (unlike a filter alone could provide). At 5.6, it has almost no softening in the center (quite sharp actually), and only modest softening towards the edges. At one point I had posted pics of my gf taken at the different settings to show the differences, but can't find the url. It truly does a great job at what it is supposed to do. After seeing some shots with it, one of my gf's friends asked to have some portraits of her taken with it. Next time she visited, we trucked it out to the beach one cold afternoon, attached to my LX with Supra loaded, and she loved the results.
[and in a later post . . .] The soft effect of the soft lenses is variable from the center outward, with the aperture controlling the amount of softness overall. In addition, the soft effect is combined with a crisp set of edges, providing a very pleasing effect.
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Flavio Minelli -[commenting on Gerald's lens which he had the chance to see for himself] . . .It's a really weird lens. . . The lens has only 2 elements in 1 group. This means you can stick a finger through the diaphragm from the back of the lens itself, although the iris itself is deep into the barrel. The visual effect was most unusual and it got stronger as you opened up. At 2.2 it was so strong you could barely get it to focus correctly. The aperture went only to 5.6, IIRC and the metering was stop down. All in all a very specialised lens but with very interesting characteristics."