CCTV Knowledge

A WD1 DVR, which records at 960 x 480, is best paired with a 700 TVL camera (976 x 496 resolution).

Those higher TVL cameras may have higher resolution sensors, but it doesn't matter since the maximum that DVRs can accept is 700TVL. Even if you have higher TVL image sensor in the camera, you can't cram more than 700 TV Lines down the cable and into your DVR.

So choose your DVR and cameras wisely as not to overspend on things that you do not get.

What is Day and Night Camera?

Day and night cameras are cameras that are able to provide video surveillance even at low levels of illumination. A day and night camera displays a full colour image during the daytime but produces monochrome (Black and white) video images at times when the lighting is poor. The camera has a device that is sensitive to the surrounding light conditions and switches the camera between colour and black & white modes automatically. It is designed to increase its light sensitivity in poor lighting conditions and at the same time reduce noise level in the images. However, the day and night camera will fail if the illumination (Lux) level is too low.

PAL VS NTSC

NTSC stands for National Television Standards Committee. It is the colour video signal television
standard: 525 lines, 60Hz

PAL stands for Phase Alternate Line. It is the colour video signal television standard: 625 lines,
50Hz