When you're planning a security camera setup, it's tough to guess if a lens will cover the warehouse aisle or just the loading dock door. A cctv field of view calculator lets you input sensor size, focal length, and distance to see exactly what area a camera sees before you mount it. It's especially handy with varifocal lenses, showing you how adjusting the zoom changes the view from wide to narrow. Instead of climbing a ladder to swap lenses, you can compare different camera specs on a diagram… cctv field of view calculator 8