How do we define the maximum distance a CCTV camera can cover?
For a camera with fixed lens and a specific resolution, is there a specific square meter per pixel ratio which is consider as acceptable?
90% of all camera are analog camera resolution determines the quality of the image and most of them are recorded at CIF or 4CIF resolution.
Now there are 3 main sizes of CCD 1/4 normally used in PTZ cameras 1/3 most commonly used and 1/2CCD used for extreme low light and specailized applications.
Now just like any other camera what a camera see’s is determined by the lens.
The most common lens sizes are 3.6mm (fixed) 2.8-12mm for indoor and 5-50mm for outdoor lenses that have two number are called varifocal lens this for example a lens that is 2.8-12mm can be set to 2.8 wide angle and maximum of 12mm and everything in between.
These are just some standard lens really high end products like Ascendent’s Terra series cameras used for boarder defense can have lens’s that go up to 2000mm.
Here is a link to Ascendent Technology Group’s lens calculator tool they are a DVR and CCTV
manufacture located in Canada and have live chat I am sure they would be happy to help you design a camera system. I have used there DVR and cameras and they are offer excellent performance and are priced well to.
http://ascendentdvr.com/tools.html (note you will most likely want to select 1/3 for the CCD size )
Hope this Helps
NPC 50 meter IR NIGHT VISION CCTV CAMERA