Ole, if it's 360mm version, and it's $49, take it without hesitation - this length is really a quite rare one, I've seen only one of these! The rarity of them is accounted for a slightly non-standart length, and these lenses worked in "two-room" reproduction cameras - the scale was regulated with focal length. Each of these lenses was very carefully made and checked, because not the polygraphy was the main buyer, but the war industry... so it's expected to perform not worse than my 300mm. This lens has both iris apeture and a slot wor different-shaped waterhouse stops - an excellent dust collector, if not closed So I think this lens is a good choice, and as I have seen it works perfectly not only in 1:1, but on the infinity, too.