The higher the Signal to Noise ratio, the clearer the video image produced by the camera. Good CCTV cameras will have a S/N ratio of at least 48dB. Some of our colour cameras have an actual S/N ratio of 60dB - much better than most while many of our cameras have S/N ratios of at least 50dB.

The Make of the CCD Chip in the Camera.
The Type and Quality of the Imaging Chip in the Camera.
The Type of DSP (Digital Signal Processing) Chip in the Camera.
Number of TV Lines.
Light Sensitivity.
Fixed CCTV Cameras.
Pan, Tilt, Zoom Cameras.