Information on the Minolta Rokkor 85/2.8 Varisoft, in Minolta SR mount (aka MC/MD mount). Spherical aberration can vary continuously from "0" to a "high value".

http://www.cameraquest.com/minsoft.htm

They cost a lot on eBay when you find one. I think collectors are not extraneous to the price tag, those are rare lenses and therefore intrinsically valuable for a collector.

Fabrizio