This iPhone application is available 'free' to JonyJib owners or anyone curious about our products. This application calculates the amount of counterweight required on our complete range of jib configurations. You just select your JonyJib model, US or Metric units, type of Motorhead and enter your camera weight. Then just select your length of jib and your fulcrum setting. The application displays the amount of weight required as well as the suggested denominations (sizes). It also displays reach lengths and front to back ratios. You'll never be on a shoot short of weights again! (calculations accurate to +-10%) Always carry a little extra weight just in case...