Things to consider when a buying CCTV
There are a number of things to look for when buying CCTV cameras. Some are technical factors which apply to every situation regardless of the intended use: every camera can benefit from a better lens and high quality sensor. Other factors are more dependent on the intended use of the CCTV camera, as some types are more useful in some situations than others. A day/night camera is great for keeping an eye on visitors coming up the drive, but it may not be the best choice for monitoring staff or business premises.
Many businesses may be better served with either dome cameras covering the entire floor or small bullet cameras to monitor the staff. Regardless of the buyer's needs, it pays to look for quality. Therefore, understand how CCTV cameras work and the importance of optical zoom as opposed to digital zoom makes it easier to recognise said quality. The most successful purchases are informed purchases, and knowing what to look for makes buying a CCTV camera much easier.
Select the type of camera: Based on your needs and recording environment, you should select a camera that is best for you:
-Wired: a standard wired color security camera. Most wired security cameras today are indoor/outdoor and have an IR (infrared) cut-filter for night vision (the night vision image will be in black & white for improved contrast and image detail). Wired cameras are available in BNC or RJ45 (connection ports) and will require video extension cables.
-Wireless: More and more people are turning to wireless cameras as a cost-effective way of building a comprehensive surveillance system in their home or business. The latest digital wireless cameras are secure, free of interference from household devices, and offer crystal clear video and audio.
Choosing the Right Sensor
Not all digital sensors are created equal. There are two main things to look for when studying the sensor specifications of a given CCTV camera: the first is the sensor type, the second is the sensor size. Most CCTV sensors are either CMOS or CCD. CMOS is less expensive and uses less power than CCD, but it is less sensitive and does not produce as clear an image, which can be particularly problematic when using the camera for identification purposes. One result of this is that CMOS-based sensors require more signal processing to produce a clear image.
The other important factor is the sensor size. The larger the sensor, the more light it can process, and the higher quality image it can produce. Most CCTV camera sensors come in one of two sizes: 1/4 inch, which measures 3.2 mm by 2.4 mm, and 1/3 inch, which measures 4.8 mm by 3.6 mm; giving it over twice the surface area of the smaller sensor. A larger sensor not only gathers more light, but in doing so gives the DSP more data to work with, which is especially helpful with the less capable processors used in budget cameras.
Select black and white or starvis(color): If you are going to use the cameras in an environment where the light conditions are very low, it is recommended to buy a black and white CCTV camera system. Color should only be considered for inside use with good lighting conditions. For consumer-grade CCTV cameras, color cameras are suitable for indoor or outdoor applications. Many high resolution color cameras now use an IR cut-filter for built-in night vision.
Understand resolution: The higher the resolution number, the sharper the image will be.