Analog CCTV Cameras: Dome, Bullet and BNC Models

TV lines, HD analog formats and the DVR that reads them

Older analog cameras are rated in TV lines, from about 420 to 700 TVL, which gives standard-definition pictures. HD analog formats such as HD-TVI, AHD and HDCVI carry 1080p or more over the same coax, but the camera and the DVR must support the same format. Many recorders accept several, so read the DVR's list. A few listings here are in fact IP cameras with RJ45 ports, so confirm the connection says BNC, because an IP camera will not plug into an analog recorder.

Lens, sensor and housing for the spot you cover

A fixed 3.6 mm lens gives a wide view for rooms and entrances, while a varifocal lens, listed as 3.5 to 8 mm or 4 to 9 mm, lets you narrow the view to reach farther. Infrared LEDs give night vision in black and white. Domes resist tampering and hide the lens direction, bullets show the direction and are easy to aim, and dummy cameras only deter, since they record nothing. Most cameras run on 12 V DC, so plan a power supply and cable.

Questions about Analog CCTV Cameras: Dome, Bullet and BNC Models

Can an analog camera connect over Wi-Fi?

Not by itself. A true analog camera sends video over coax cable with a BNC connector to a DVR. Cameras that connect by Wi-Fi or Ethernet are IP cameras, so read the connection field before deciding.

What does a varifocal lens do?

It lets you adjust the focal length, for example anywhere between 3.5 and 8 mm, so you can widen the view for a room or narrow it to see further along a drive without moving the camera.

Does an analog camera need a separate power cable?

Usually yes. Standard BNC carries video only, so the camera needs 12 V DC through its own lead, often supplied in a combined video-and-power cable. Long runs lose voltage, so check the cable gauge and supply rating.