FAQ - Cameras and Lens
Q. What are CCD and CMOS? Video Resolution is very important in your purchase of a surveillance camera. The term resolution refers to the amount of detail you can see in an image. Cable TV delivers about 300 and VHS tapes have 250. The more horizontal TV lines the better the picture. The average CCTV camera is 300- 420 lines.
CCD and CMOS Better known as the imaging element, this is what converts light into electrical images. Charge Coupled Device (CCD) & Complementary Metal Oxide Semiconductor (CMOS) are critical components that act as the camera's "digital film" and are responsible for the resolution and overall quality of the picture.
The advantages of CCD over CMOS are, "better light sensitivity "sharper images "enhanced colors "higher quality level. Since the cost of a CMOS element is less expensive, most inexpensive cameras use CMOS. The TV Lines of our wired and wireless cameras range from 420 to 600.
Q. What's an "Outdoor Security Camera"?
Outdoor Security Cameras the capabilities of the security camera and lenses must be configured to perform according to the variations in illumination and temperature. Due to exposure to humidity and freezing, most of the high performance security cameras are not appropriate for as is outdoor exposure; instead, either use an indoor -outdoor bullet security camera or an enclosure is required to maintain steady temperature and humidity.
Q. What's an "Indoor Security Camera"?
Indoor only security cameras limited to operate within fixed temperature ranges, these security cameras are available pre- equipped with lenses, or mostly the lenses are purchased separately, depending on the application.
Q. What's an "Indoor-Outdoor Security Camera"?
Indoor-Outdoor security cameras for medium to high image quality and flexibility, the bullet security cameras are both cost effective and versatile. They can be installed either indoors of outdoors without any need for a heater and blower enclosure. Pre-equipped with various kinds of lenses, the bullet security cameras maintain a steady (high) temperature within the tiny enclosure.
Q. What's a "Dome Security Camera"?
Dome Security Cameras Among the most versatile types of enclosures. Can be used for both indoors or outdoors applications. Easily accessorized with Pan/Tilt/Zoom capabilities, they offer an aesthetic appearance. Lens are usually interchangeable.
Q. What does Manual Iris Lens mean?
Manual iris lenses provide an effective solution for applications where the scene and lighting requirements are relatively stable, especially when used with security cameras that are equipped with electronic shutters.
Q. What does Auto-Iris Lens mean?
Auto iris lenses produce consistent video signals in scenes with varying light levels, thus enabling reliable surveillance in areas that would otherwise be compromised.
Q. Should I use Manual or Auto Iris Lenses?
You can save money and use Manual Iris Lens only when scene illumination never changes. Example: illuminated store or office. If the light changes a lot it is recommended using Auto-Iris.
Q. What's Varifocal Lens?
The varifocal lenses are ideal in situations where the security camera surveys a distant point. One can adjust the zoom and focus of these lenses either manually or automatic
Q. What Focal Length will I need?
- Guide: smaller the focal length number => wider is field of view.
- If you have securit camera in the office or warehouse and you want to see as much as you can, you should go for 2.8 or 4 mm lens (makes wide, somewhat distant view)
- If you want to observe limited area, like entrance you should go for 8mm or (makes narrow view and objects are closer).
- Give us a call and we can help you determine what security camera lens will best suit your location.
- Use varifocal lenses to get flexibility for choosing best field of view.
Q. Do you have a Lens chart?
CCTV Security Camera Lens Chart
Indicates total viewable area (WxH) at a given distance based on focal length used
|Focal Length||5' (WxH)||10' (WxH)||20' (WxH)||40' (WxH)||50' (WxH)||100' (WxH)|