How do you work out the field of view and focal length? Well if you are good at trigonometry you probably previously know how to do this. On the other hand, if you are like me, you might desire an easier method to figure this out.
There are a few methods to do this. Some installers will employ a Lens Selection Wheel. It is a product like a pocket slid ruler that you can employ to decide a couple of the key options we will discuss below and then it will show the right lens choice. Others will employ some type of spreadsheet calculator or even an online web based calculator that will let you to enter a couple of the factors and offer you a final result. You could also make use of some basic math to figure out as well.

Here are the few main factors that are significant to be familiar with when calculating CCTV field of view.
You also have brief knowledge about what The Best Lens For Sony A6000 is and how much it cost . First you must be familiar with the CCD imaging device size in the CCTV Security Camera. If you do not be familiar with this you will not have a precise number in your calculations. For our purposes we will be talking regarding a sensor that is a 1/3rd inch size sensor. That is one of the more ordinary sizes used. The real physical horizontal dimension of this sensor is 4.8mm.
Then to settle on which lens you will require you need to recognize the distance to the object/scene and the preferred width of the object.

Let’s see how we would settle on the right lens for a scene where the preferred width of the scene is 10 feet wide with a distance from the camera of 80 feet. 80 feet and 10 feet become the two key factors that you could employ with a lens selection wheel or online calculator, or we can do some simple math.

In our instance 80 feet is the distance. We will split that by the width desired of 10 feet. That gives us the number 8. Then we multiply 8 times the image size mentioned above of 4.8mm and get a number of 38.4. That is 38.4mm for the focal length of the lens desirable to match our desired field of view for this scene. In other words the horizontal field of view of a 38.4mm lens for a 1/3rd inch image sensor in a safety camera would be 10 feet broad at a distance of 80 feet. The degree of view or angle of view would be 7.15 horizontal degrees which is a fairly narrow view.
That in fact is all you necessitate to be acquainted with for a simple way to decide the correct focal length of the lens for a safety camera. Now the next big choice is which security camera to use.