Looking down on my new Heliar, mounted to the Bessa L I can see that the lens wont screw in as far as it should and that the hood is not square with the film plane.
Can you post a picture? Someone will correct me if I am wrong, but the lens should project a circular image on the film, so even with it not being screwed it properly it will cover the film; however, the built-in petal hood may show and the lens will not focus to infinity properly.
most screwmount lenses screw in a little further than where the top of the lens would be straight up. I don't think it hurts anything, but with a lens with a petal hood, it may!
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