What to Consider When Buying a CCTV Camera
There are several important factors for consideration when you buy a new CCTV camera, most of which are related to the basic hardware components; thus, understanding such components and their influence on the CCTV camera’s performance is an integral to any shopper.
The lens is what collects the light that will be used by the sensor. Everything you see or is recorded on the DVR passes through the lens. Since the lens controls focus, it sets the distance at which you can read a car’s number plate or recognize a face. In lots of cases, using a better lens is more useful than using a higher output resolution, given that input dictates output, and lens dictates input. Also consider buying a zoom lens, which really comes in handy when you scrutinize video recordings in which details are vital.
Options – Getting Started & Next Steps
5 Uses For Security
Type and size are the two most essential points you should think of when considering a CCTV camera for its sensor. In most cases, CCTV sensors are CMOS or CCD. CMOS is lower both in cost and power consumption than CCD, but because it is also less sensitive, it produces lower quality images. When it comes to size, bigger sensors can process more light, and thus produce better images. The two common sizes CCTV camera sensors are sold in these days are 1/4 inch (measures 3.2 mm by 2.4 mm) and 1/3 inch (measures 4.8 mm by 3.6 mm.
Tne usual specification for CCTV cameras is how many TV resolution horizontal lines – also called their TVL – they can output. Some experts say this should be at least 420TVL, but this is not true for all cases. A high resolution may be good to have, but considering that the output depends on the input, any extra resolution is wasted if the lens and sensor could not match the output resolution, which is dependent on the DSP. What really matters is that there is enough resolution to clearly display any image produced by the camera.
Cylindrical in shape, bullet cameras are typically used in cases where discretion is important, but where the camera need not be installed permanently in a protective dome. They are perfect for service areas and shops in which the staff needs to be monitored.
A CCTV dome camera is the ideal choice for surveillance because it doesn’t only protect itself from vandals, but it also offers a degree of security because it’s usually impossible to tell where the device is pointed.
> IR Day/Night
Although obvious in appearance, these IR day/night cameras can provide 24-hour outdoor coverage under any lighting condition. They come up with colour images during the day and shift to black and white for infrared viewing during night time. Purchasing a CCTV camera isn’t going to be that simple indeed. But with this information, you should have a great start.