CCTV Design Lens Calculator - Version 1.0 CCTV Design Lens Calculator is an easy free tool for CCTV design. It offers standard functions of Lens Calculators - calculation of the field-of-view size depending on the distance and the lens focal length as well as several new, more effective tools.CCTV Design Lens Calculator allows you:Choose lenses and positions for camera installation.Choose CCTV cameras with optimal resolutions.Calculate distances up to which specified criteria of spatial resolution (pixel density) and field-of-view size are satisfied. Calculate spatial resolution (pixel density) and field-of-view size at specified distances. Using automatically scalable pictures, estimate details of images of various objects at specified distances.