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Hello, a friend of mine gave me this Heliar 42cm. The barrel is un lousy condition but iris and glass are quite OK so I would like to put it back to work. I found strange that the way the flange is positioned, the branded part goes inside camera body. But it leaves the aperture ring and a lens hood properly on the outside. Not sure if this lens hood is original because I have an Heliar 24 cm and it hasn't any. I would love to see a picture of a well maintained Heliar 42cm in barrel for comparison. Could anybody post one here? or any comments on this assembly?