How do I use the ExpoAperture Guide with my medium format 120/220 film camera?
Using the ExpoAperture Depth of Field Guide with medium format film (120/220) is very simple; you either multiply or divide the number of zones by two as you switch from one side of the Guide to the other. If starting on the front of the Guide, multiply the number of zones by two and use that number of zones on the Zone Dial. If starting on the Zone Dial, divide the number of zones by two and use that number of zones on the front of the Guide. Click here for detailed instructions.