Then again there is nothing wrong with images that do not have absolute blacks. In alt printing we take advantage of the good separation of light tones, meter for the light tones and let the dark tones fall where they may.

So then you have two approaches, you can "force" the contrast by trying to expand the contrast in the film or you can meter for the highlights and let the dark tones fall in middle gray. In each situation you will have an image that will have a very different feeling.
It all depends what you want to communicate in the print.