The BTSZ incident system is not even intended to deal with any SPECIFIC reflectivity. If you read the manual on it and try it I firmly believe that you will find reflections that should show detail are accomodated very handily by the system. What may be difficult for one steeped in traditional zone system lore is the fact that you are not trying to place any object on any zone. You are merely providing an exposure and developing time to take care of all the tone the film can handle ..if they exist in the scene or not is immaterial. Everything from jet black in shadow to extreme white in sunshine is covered. This is a very firmly grounded system based on sensitometry. Read the manual, think about it and try it. It works very nicely.