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This passage explains what is the viewable earea of a camera, and gives picutes as examples to demonstrate. The examples below are based on a CCD Camera with a 1/3" Image Sensor. CMOS and cameras with different size image sensors will vary from these numbers, but this guide can be used in those cases as an approximation.
   
Actual Examples of Field of Vision
This car is parked 10 meters away from the camera. Notice how the car appears closer and how there is a narrower field of view as the lens size becomes larger
 

Lens Size  3.6mm Lens    Field of View 92 degrees     Recognizable Distance 10 – 15 feet     Best Picture Distance 5 feet     Viewable Area at Given Distance 14' (W) x 10' (H) at 10 feet	3.6 mm Lens - 78 Degree View
Lens Size  6.0mm Lens    Field of View 57 degrees     Recognizable Distance 20 – 25 feet     Best Picture Distance 7 feet     Viewable Area at Given Distance 16' (W) x 12' (H) at 20 feet	6 mm Lens - 56 Degree View
Lens Size  8.0mm Lens    Field of View 38 degrees     Recognizable Distance 25-30 feet     Best Picture Distance 10 feet     Viewable Area at Given Distance 18' (W) x 14' (H) at 30 feet	8 mm Lens - 36 Degree View
Lens Size  12mm Lens Field of View 26 degrees     Recognizable Distance 35-40 feet     Best Picture Distance 12 feet     Viewable Area at Given Distance 16' (W) x 12' (H) at 40 feet	12 mm Lens - 25 Degree View
Lens Size  16mm Lens    Field of View 15 degrees     Recognizable Distance 50-60 feet     Best Picture Distance 18 feet     Viewable Area at Given Distance 15' (W) x 12' (H) at 50 feet

We would be happy to work with you to help you choose the right camera and lens for your specific surveillance project. Most of the cameras we sell can be configure with the lens sizes as per your request.