I already own (and use...) a 4x5" camera. I would like to try a brass lens on it to see if I can achieve a very vintage look for my images. There are plenty for sale on ebay. Some of them are sold for 30 euros, some of them for 200 and more... Why so differently priced? What I should look for in a auction? Do you know any good website that provides information about brass lenses? Have you got any suggestion or brand model? My camera is a folding and has a maximum bellows extentions of ca. 25cm, hence regular "4x5" lenses won't always fit the camera. Tia!