CCTV Lens Calculator

* Simple and easy to use.
* This generic CCTV Lens Calculator calculates the lens required for a CCTV camera. 
* Now with scene calculation based on focal length.
* Calculate using feet or meters.
* Enter distance from the scene, horizontal distance of scene and height of the camera, then click 'calculate'. 
* Results show lens required, angle of view and pixels per meter(feet). 
* Indicates if the object or person can be: "Identified", "Recognised" or "Detected".
* The new scene calculation allows you to calculate the scene dimensions, based on a focal length value.
* Calculate horizontal distance of a scene based on focal length and distance between cameras and subject.
* Calculate distance between camera and subject based on focal length and horizontal distance of scene.
* Scene calculation allows you enter vari-focal lens min/max focal length and use a slider to easily switch between values.