Zoom Lenses

As with regular surveillance cameras, the lens on a surveillance camera which determines the width of an image is created and the amount of light is allowed to enter

The lenses you purchase should match the format of the surveillance camera: 1 / 4 "lenses work best with 1 / 4" cameras. You can use a larger format lens than the surveillance security camera requires, but not recommended.

In addition, fixed focal length lenses offer only a golf game see and are the least expensive. To change the resulting image, you must use a different lens. Focal variable camera lenses and zoom lenses offer greater flexibility, allowing you to adjust the image field of view. Motorized zoom lenses, the most expensive type available, give you the ability to control their camera remotely. If you want to move away from general surveillance and in the details when the spot suspicious activity, motorized camera focus is preferable.

If using the surveillance camera outdoors, look for a lens with an auto iris. As in the human eye, iris of a lens is what controls the amount of light entering the surveillance camera. Auto Iris can significantly improve the performance of outdoor cameras, where light levels vary considerably. However, you can save money and use a manual iris lens when the scene illumination never changes, for example in a shop or office lighting, but not recommend it.

Dome housing and PTZ cameras protect and hide orientation.

Pan, Tilt, Zoom

For security reasons advanced applications, you may want a pan, tilt, zoom (PTZ). With the right equipment, a camera operator can move (scan left and right), tilt (up and down), and closer and out. The significant catch is the cost: PTZ systems are more costly than fixed cameras, but most users find the most effective for monitoring.

Camera Housing

Cameras should be protected from any harmful elements. Housing can range from simple coating, for protection, weather-resistant housing that include heaters and blowers for cooling. A more specialized type of housing is the dome: color Plexiglas hemispheres that prevent subjects from seeing which direction the camera is pointing. Choose the right housing based on the placement of surveillance camera and its intended use.

About the Author:

Mark Allen is a frequent writer on surveillance cameras.

Article Source: ArticlesBase.com – Security and Surveillance Camera Lenses

Zoom Lenses

Zoom Lenses