Online calculator is now available to help surveillance photographers select the best combination of lens and digital SLR camera model. Because the calculator includes array and pixel size data for the detectors found in current model Nikon and Canon dSLR cameras, the tool can calculate the projected pixel size at a certain range and the pixel and lens fields-of-view for a camera and lens combination. In addition, for a given object size, the calculator estimates the maximum distance for detecting, recognizing and identifying objects of interest. With this calculator, photographers now can estimate the desired range performance or determine what lens focal length is required for the camera that is being used to achieve the range objectives necessary.
