Robert, I'm not actually sure which of the C400 series calumet cameras I own. I had a friend who offered me a: "Calumet 4x5 camera with a rotating back and Ilex 7.5" f/4.5 lens" for very cheap and jumped on it.

If you have any suggestions about which calumet camera I have let me know, it's grey, has a rotating back, and the monorail is round with a notch in the bottom and is 19" long