I see that my thread is still alive...
I'm pleased!
I just received the Tamron SP f/2.5 70-150mm Soft Focus. I've been waiting for a decently priced one for quite a long time.
I found one!
I will do my best to test it.
Lately i couldn't use my SF lenses that much. Absolutely zero with my large format lenses (i don't shoot large format anymore, but i still treasure my vast collection of LF glasses), and i had very few chances to enjoy those usable with my Pentax digital camera.
I live abroad and i mostly do travel photography, and the only manual focus lenses i take with me are a f/1.2 50mm and a macro 90mm.
Now i'm back home for some time, i intend to put through its paces each of the SF lenses i own.
Those readily usable with an APS-C sensor are those present in the list linked in my signature (click on "LENSES USED WITH DSLRs").
The large format glasses have too long focals to be really usable. The only one worth a try is a very old "Plasticca" (in barrel, of relatively short focal), which could be adapted in some way to a focusing helicoid or bellows. I'm dubious, though. Good luck mastering a lens affected by strong chromatic aberration!
Here are two portraits taken by my girlfriend (poor focusing!), as simple tests.
shot with the old 85mm series K, at different diaphragms:
EDIT:
Removed the first pic because it was taken with a Helios 44-2 2/58mm wide open. Not tack sharp but definitely not SF either!
Cheers
Paolo