I've been asked to photograph a fine-art drawing. The drawing is done in pencil includes shading that runs from almost pure black to almost white. Any thoughts and/or recommendations on film speed? I typically shoot Ilford PanF 50 or their 125 speed film. I have occassionally shot their Delta 200 and 400. I plan to shoot this with both medium (6x6) and large (4x5) formats. Thanks in advance for your thoughts.