I am carrying out film test with the help of Stauffer's 35-21projection step wedge. I shall put the wedge in slide duplicator and expose the film the same way as duplicating a slide.The aperture in the duplicator is fixed-i.e.16. However, the exposure- under/over can be controlled through the camera by means of exposure compensation. I would like to know as to how I expose th e film i.e. normally or under/ over expose for the purpose of evaluating the film speed ?