Mount In high areas. If you plan to mount your camera in an area higher than 12 feet, like a warehouse ceiling that is usually around 24 feet, a regular lens like 3.6mm will produce a very wide general view picture, with out the ability to zoom and identify activity details. In this kind of environment make sure to use a Vari Focal lens, so you can adjust the picture to the desired view without overlapping with other security camera pictures.