The purchase of a CCTV camera is an expensive matter. So it should be well thought out before buying. The most important part of the CCTV camera is the camera because it acts as the eyes of the system. There is no such thing as to buy expensive or big CCTV cameras. First you need to identify your needs or needs. If you can identify the needs, it is very easy to buy the camera in conformity with it. If the demand is known then the buyer can make quick decisions and buy the good camera properly. So first you need to know enough information about CCTV cameras.
How CCTV Cameras Works
Most CCTV or closed circuit TV cameras used for home security are solid-state electronic devices that are connected to a central recorder. So it broadcasts it in a specific location and it is also known as closed circuit cameras. The main components of the camera include lenses, sensors and DSP or digital signal processor. The work of the lens is the focus on the light which holds the sensor image and transfers it from the sensor to the DSP. DSP transforms into a TV signal. After that the signal is transmitted or sent by the radio to save or visit the central location.
The things to consider in the purchase of CCTV cameras
There are some important elements to consider when buying CCTV cameras. There is one or more hardware components that do not even know.
Selecting the right lens - The work of the lens is to collect the light for the sensor. All what the user sees or records on the DVR is all done through the lens. At what distance a car number plate can be placed and the face of someone can be identified which determines the lens as the lens controls the focus. In many cases the lens is more effective than the output of the output output because the output is always limited by input and the lens is the input system. Besides, zoom lenses are also available in the market. Some CCTV cameras have digital zoom and the rest have optical zoom which is controlled by the lens. Optical zoom should be emphasized on the digital zoom as far as possible. The digital zoom problem is that it can not add a theory to the original image. Optical zoom can add new theories to the original image because the image changes with the light sensor as it reaches.
Choosing the right sensor - Not all digital sensors are the same. In the case of CCTV camera sensor verification, two things to consider are: Sensor type and sensor size. Most censors are not CMOS, CCD. Both CMOS performance and sensitivity are less than the CCD. As a result, it can not hold a clean image. Therefore, CMOS should not be used for identity recognition. But the advantage of CMOS is that the price is less than the CCD. The CMOS-based sensor has a lot of signal for proper image capture
To process. The size of the sensor can be as large as the light process and the quality of the images. The size of most sensors is 1/4 inch or 1/3 inch. By 1/4 inches 3.2 by 2.44mm and 1/3 inches by 4.8 by 3.6mm can be measured. Large censors do not just carry huge lights, giving additional information to DSP to work, which is helpful for low-budget budget cameras.

Choosing the right output resolution - A typical specification of CCTV cameras is the number of flat-screen TV lines or TVLs. Its range is up to 700 TVLs. 380 TVL and 540 TVL cameras are available. Experts hold the 420 TVL as the lowest, but it does not apply in all cases. Itput depends on input. So if the lens and sensor can not match the output resolution (determined by the DSP), then the excess resolution can be totally futile. So the important thing is that there is enough resolution which can be clearly displayed on the camera.
Different types of CCTV cameras
The size and structure of all CCTV cameras is not the same. Cameras are also different depending on the requirement. Below are examples of 3 types of basic camera
Bullet Camera - These small cylindrical cameras are usually used in situations where discretion is very important. However, it does not need to be installed permanently in a security domain. It is suitable for use in shops and services.
[sb] * Dom camera [/ sb] - DOM cameras are great for monitoring. It not only protects the camera from casual damage but also offers much security. It is almost impossible to understand the way the camera points.
IR Day / Night Camera - Whatever the status of the lighting, these cameras provide 24 hours of outdoor coverage. These are the images of a specific color during the day and the night transforms into infrared view for infrared view.
Depending on the purpose and demand of the user, he will use the camera. If you can determine the needs of the camera is very easy to choose
Select the correct CCTV camera
The first thing to consider when purchasing the right camera is the lens. The lens provides a clear image to the user. The second is the sensor. Shopper 1/3 inch CCD sensor should be purchased for processing because it provides the most information diesapite. The end feature is the camera output resolution. Its usefulness depends on the first two features. After determining the hardware capabilities, the customer will have to determine in the second stage that the camera is compatible with its needs. To cover a wide range of outdoor areas, such landlords can use day / night cameras to protect their property. Bulk cameras and dome cameras for shops or businesses are good for monitoring staff. 
How CCTV Cameras Cost
The price of a good CCTV camera is determined by combining camera quality, providers, and many other accessories. You can go to the websites of some CCTV cameras providers right here and find out about its price. Find Google's CCTV camera price and search 10-12 and visit the website.
