How Do I Choose The Right Lense For My Security Camera

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Are you planning to get a security camera? Getting security cameras and wireless systems can be of big help. For those who already have, sometimes there is one thing that people ask, "how do i choose the right lense for my security camera?"Choosing the right lense helps give a clearer view of the situation. See below to know more about it.

How to Choose the Right Lens For a Security Camera

How do you calculate the field of view and focal length? Well if you are good at trigonometry you probably already know how to do this. However, if you are like me, you might want an easier way to figure this out.

There are a few ways to do this. Some installers will use a Lens Selection Wheel. It is a product like a pocket slid ruler that you can use to select a couple of the key options we will discuss below and then it will show the correct lens choice. Others will use some type of spreadsheet calculator or even an online web based calculator that will allow you to enter a couple of the factors and give you a final result. You could also use some basic math to figure out as well.

Here are the few key factors that are important to know when calculating CCTV field of view.

First you must know the CCD imaging device size in the CCTV Security Camera. If you don’t know this you will not have an accurate number in your calculations. For our purposes we will be talking about a sensor that is a 1/3rd inch size sensor. That is one of the more common sizes used. The actual physical horizontal dimension of this sensor is 4.8mm.

Then to determine which lens you will need you need to know the distance to the object/scene and the desired width of the object/scene.

Lets see how we would determine the correct lens for a scene where the desired 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 use with a lens selection wheel or online calculator, or we can do some simple math.

The formula for this is (distance/width)*image size = lens focal length.

In our example 80 feet is the distance. We will divide 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 needed 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 security camera would be 10 feet wide 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 really is all you need to know for an easy way to choose the correct focal length of the lens for a security camera. Now the next big choice is which security camera to use.

Author: Peter Brissette

by Peter Brissette Here is an easy to use online CCTV Field of View Calculator. Visit our website for more information about CCTV Security Camera Systems Training, information and expert advice for low voltage contractors wanting to enter the video security industry.

Article Source: http://EzineArticles.com/?expert=Peter_Brissette

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