Quote Originally Posted by Bill Burk View Post
If you place your shadows on Zone IV, even Zone 0 will fully separate.
Bill, doesn't this statement assume you have chosen a suitably low ISO ? If you rate your film at the box speed or higher, then Zones 0, I, II and probably III will be in the toe of the film's HD curve, thus undergoing compression (the lower the zone the much more compression it will suffer).