Short Course on Systems – What You Need To Know

What to Consider When Buying a CCTV Camera

There are many important factors to look into when buying a new CCTV camera, most of which concern the basic hardware components; therefore, understanding these parts and how they affect the CCTV camera’s performance is crucial to any shopper.

Lens

The lens controls how much light enters the sensor. Anything you see or whatever is saved on the DVR comes 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 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 buying a zoom lens, which really comes in handy when you scrutinize video recordings in which details are vital.
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Sensor
Smart Ideas: Installations Revisited

There are two very important things to look into when it comes to a CCTV camera’s sensor: type and size. In most cases, CCTV sensors are 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 you talk about size, larger sensors process greater amounts of light, hence producing higher quality images. There are two common sizes CCTV camera sensors are sold in today – 1/4 inch (3.2 mm by 2.4 mm) and 1/3 inch (4.8 mm 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. According to some experts, this should be 420TVL at minimum, but this is not the case all the time.

Although it would be great to have a high resolution, remember that output is dependent on input, which means whatever extra resolution is added will only go to waste, unless the lens and sensor are able to match the DSP-determined output resolution. What’s most important is having enough resolution for any image produced by the camera to be clearly displayed.

Types

> Bullet

Bullet cameras small cylindrical CCTV cameras are often used in environments where discretion is important, but there is no need to permanently install the camera in a protective dome. They’re great for shops and service areas where the staff must be monitored.

> Dome

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. In the day, they produce color images; at night, they convert to black and white for infrared viewing. Indeed, buying the right CCTV camera isn’t going to be that easy. But with this information, you should have a great start.

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