A two conductor wire 22 gauge or bigger is recommended to be installed along with the RG59 coax cable to connect the camera. The power wire can be installed from the camera to the nearest outlet. It is preferred to run the camera power to the outlet nearest the monitor or VCR for easy troubleshooting if a problem were to occur. When connecting a camera that requires 12 VDC, be sure to observe the polarity indicated on the camera installation instructions. When installing a camera that requires 24 VAC you will not need worry about the polarity.
Some cameras have manually adjustable lens.
The lens usually have two adjustments, one for light and the other for focus. The light control ring adjusts the iris to allow the amount of light needed for optimal video picture. The focus ring allows for the fine tuning of picture clarity. First adjust the light level and then adjust to the desired focus setting. Once this process is complete be sure to check the light level again to ensure the sharpest picture available.