I've been looking for a lens for my new Shen-Hao 4x5 on eBay and have come across several statements similar to this one over the course of the past month or two (from an auction for a Rodenstock Sironar 150mm f/5.6 with no reserve and a starting bid of $49.99):
"This Lens is in Excellent condition with no blemishes on the casing. There is glue separation within the lens which can be overhauled, however this minor flaw has NOT interfered with picture quality!"
First, it seems to me that a lens cannot be in "Excellent" condition if there is glue separation among the elements. Second, it also seems to me that such separation WOULD interfere with picure quality, at least lowering the amount of light that gets through the lens to the film. Finally, I wonder what an "overhaul" of such a lens would cost and if it is so prohibitively expensive that the lens isn't worth buying at any cost?