So I went to use my favorite enlarger today at the darkroom. (Omega Universal 4x5) It's got a lens turret set up with a Rodagon 135mm 5.6 and a few other lenses. I've always used it to enlarge big prints with my 35mm and medium format negs, but when I went to go enlarge my 4x5 negs (new to 4x5 btw) there was serious vignetting making the image unable to print. It SEEMS like the lens doesn't cover the whole 4x5 negative. (You can see of the neg in the vignetting portion.) The manager there says he is going to look into getting a "4x5" lens, but it seems strange that that lens doesn't work. Anyone have a clue?