Description: Nice high end APO enlarger or macro lens hard to come by. It can ALSO be used as a "doublet APO front" to make your own telescope (when you add an eyepiece, image is reversed but very sharp image comes through). It seems symmetrical design (CONVEX lens "output" at each side of it, a kind of plössl design put in reverse). So it can work as projector lens, enlarger or loupe with your own eyes. It has a 35mm inner field stop placed between both lenses (not variable, fixed). For rest of measures, see pics.

Condition: it has some scratches and coating marks in the exterior surface of one of the external sides (the other side and inner lenses are nice). So, there is one lens (out of four, since this is 2+2 design) that is damaged.