From what I understand, dynamic range refers to the dmin, dmax and ALL of the tones in between. Typically dynamic range comes up a lot with digtial, but its applicable to film also. You would preferably meter, expose the film, develop and print etc to acheive the most "information" in each step. A high contrast image on the other hand would have very high dmax areas and very low dimin areas, but very few of the tones in between.