Select the desired resolution (General, Forensic or High Detail) followed by the sensor resolution you are budgeting for. The calculator will tell you the maximum field of view width based on your selection. If the field of view is narrower than you require, consider going to a higher resolution sensor. Next, indicate the camera distance from the furthest object in the field of view, as well as the planned camera mounting height. The calculator will then tell you the specific lens focal length required to meet your specifications.
