CCTV Camera Choices 

CCTV cameras come in an abundance of makes, sizes, models, usability and suitability. It is essential that a few specifications are not compromised. Cameras display images in different levels of resolution. Any resolution below 420 TV lines is unacceptable. Clarity is a key element to the effectiveness of any cctv image and no compromise can be made here. Most good quality cameras come with a variety of lens options - from fixed focal lengths to variable focused lengths. Choosing the correct lens is critical to each camera placing. Scroll down for more information on lens.

 These are typical fixed position dome cameras - often seen in banking halls. They offer a cost effective, discreet and unobtrusive option for many indoor applications. Viewing range is limited. They come with fixed and variable lens option.

This is a modern bullet camera - suitable for indoors or outdoors. Attached to the building via a bracket allowing infinite adjustments for viewing.

Often seen as older technology - the box camera is usually installed outside in a weatherproof casing. Box cameras offer the options of being coupled with lens that allow identification at long distances. Recording a vehicle registration number at an entrance may be an application.

Bullet cameras can be fitted with Infra Red compatibly. It is important to realise that Infra Red compatibly will not enhance images taken in poor light. IR works effectively where there is no light at all - below 0,8lux (A candle in a room provides about 1 lux). These bullet cameras are the latest in lens configuration. One lens works in daylight and colour - the other in low light - above 1 lux - and Black/white. These cameras are still under patent.

Lens

Lens configuration can be almost anything. Cameras can be fitted with fixed focal length lenses- much like an instamatic camera. Lenses can be variable focus - which means they can be manually adjusted but remain fixed until adjusted again. This is useful if camera or image position is to be changed from time to time. Lenses can also zoom under control of a operator driven joystick. If attached to a pan and tilt mechanism, this camera can rove, zoom in and out - and then be left in a fixed position if the operator chooses.

Choosing the correct lens is important. The wider the view the shorter the focal distance. The further the image the narrower the view.