Just yesterday I got the package from Germany, a brand new (used Zone VI 8x10... I was really suprised bu its bulk and weight (something like 7.5 kg with the Fuji 420mm lens) and the capabilities (swing, tilt, bellows extension)... I guess that I will have to exercise more to build my muscles and to be able to carry it around... Anyway, here are my questions to you LFers (and Satinsnow in particular, for the first one): There is a mark (see photo) on the ground glass, in resembles to a grease mark (like if someone touched the inside part of it with dirty fingers). Can it be cleaned with some detergent ? Is it dangerous to use chemicals on the inside surface of it ? The camera uses Sinar lensboards (this is good, for I can use all the Horseman lensboards I have). Has anyone tried to mount a Zone VI lensboard on a Sinar (or a Horseman) ? The size and thickness are the same, but the Sinar ones have a strange pattern on the inside surface that might be there for light-fastness reasons and the wooden ones I got for the Zone VI don't. There is some (only cosmetically disturbing) oxidation on the brass parts. Can it be removed, using something like Brasso ? I got a 4x5 reducing back with it, which I doubt I will ever use, for the camera is too heavy to carry around and my Linhof is much smaller and lighter. Would anyone be interested in buying it ? How much would it be worth ? Do you think it would be a good idea to sell it, or will I regret it some day ?