Hi, if I recall correctly, the proxars made for 645 and 67 lenses were 2-element at least.
From Pentax, yes but not the "Proxar" brand by Zeiss (Hasselblad and others), these are one single-element, a source of dissatisfaction for Hassy users who rely on Nikon and others.
There is a weblist of all proxars with more than one element, btw. Searching for it should get you the address (I don't have it).
http://www.angelfire.com/ca/erker/closeups.html
Good starting point but far from complete.
Andre
