Indeed I do use a Wollensak 90 enlarging Raptar with coated elements. It was designed to cover 6x9 and is slightly wide angle for the format. These were state of the art in their day. I have a 75mm el-Omegar that is basic 4 element that I never use, and prefer the Wolly to everything else. I shoot 6x6 and 6x9 so the Wolly covers everything I do in medium format, and I even use it for 35mm to make enlargments up to 8x10. BTW, I actually have two of them, holding a NIB unit for back-up.
Here's a print made using the Wolly: http://www.apug.org/forums/members/r...kemika-km.html