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What to Consider When Buying a CCTV Camera There are several important issues to consider when you purchase a new CCTV camera, most of which have something to do with the essential hardware components; hence, understanding these components and their effect on the CCTV camera’s performance is critical to any shopper. Lens The lens collects light for the sensor. Anything you see or whatever is saved on the DVR comes through the lens. As the lens dictates focus, it’s responsible for determining the distance at which a face becomes recognizable or a car’s number plate becomes readable. In a lot of cases, it’s better to have a good lens than a high output resolution, considering that the depends on the input, and the input depends on the lens. Also consider purchasing a zoom lens, which can really come in handy when’re analyzing video recordings that could contain critical information.
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There are two things you should think of when choosing a CCTV camera based on its sensor – type and size. Typically, CCTV sensors would be CMOS or CCD. CMOS is cheaper and more energy efficient compared to CCD, but it is also less sensitive and produces a less clear image. When it comes to size, bigger sensors can process more light, and thus produce better images. You can find CCTV camera sensors in two common sizes nowadays – 1/4 inch (measuring 3.2 mm by 2.4 mm) and 1/3 inch (measuring 4.8mm by 3.6 mm). Output Resolution One common specification for CCTV cameras is TVL or the number of horizontal lines of TV resolution they can output. Some experts say this should be at least 420TVL, but this is not true for all cases. A high resolution is great to have, but remember that output depends on input, so unless the lens and sensor can match the output resolution, which depends on the DSP, the extra resolution is of no use. What really matters is that there is enough resolution to clearly display any image produced by the camera. Types > Bullet Bullet cameras are cylindrical in shape and are usually used in environments in which discretion is important, but it is unnecessary to install the camera permanently in a protective dome. They are just great for service areas as well as shops where the staff should be monitored. > Dome A CCTV dome camera is most suitable for surveillance because it protect as it not only protects itself from vandalism, but it also offers a certain level of security as it is usually extremely difficult – if at all possible – to know which direction the device is pointed. > IR Day/Night Though it’s easy to tell by their appearance, these cameras can offer round-the-clock outdoor coverage in any lighting condition. They produce color images during the daytime and move to black and white at night for infrared viewing. Purchasing a CCTV camera isn’t going to be that simple indeed. But with this information, you should have a great start.