That's probably because it's a bit complicated. If you're not prepared for a little reading and thinking about it, you shouldn't consider using it.(posted 8892 days ago)The nine-word summary of the zone system is: "Expose for the shadows and develop for the highlights!" No one can give you numbers of zones with this or that development because - that's the central point of the zone system - you have to calibrate the system to your technique and your equipment.