The following is written in order to help you to understand what different types of CCTV Cameras are being used in Security Camera Installations today and how we at Ideal CCTV determine, which one to use. These are the main types of CCTV Cameras:
|Outdoor Dome Camera
Vandal Dome Type
|IR Vandal Dome Camera
Outdoor IR Dome Type
Eyeball Dome Camera
|Mini Dome Type
Not Vandal Resistant Dome
Internal Dome Camera
|PTZ Dome Camera
Pan Tilt Zoom Dome
Fully Functional Speed Dome
|Housed Body Camera
Outdoor Box Camera
Camera in CCTV Housing
|Outdoor Housed IR Camera
Outdoor Housing with IR Spot-Light
|HD IP CCTV Camera Type
Mobotix Megapixel Camera Type
These Cameras can be/ incorporate:
- DSS Night-Vision
- Infra Red Night-Vision
- Vandal Resistant
Housed Cameras Vs Dome Cameras: Housed cameras (CCTV Cameras in Wheather-Proof Housings) are used, when the camera needs to have a very far zoom, or when a very high deterrent effect is desired. Static (not rotating) Dome Cameras look neater and are not as obvious. Professional Dome Cameras have the same picture quality and specification as Housing Surveillance Cameras, but aregenerally easier to install and slightly cheaper to purchase. Most professional Dome Cameras incorporate a three-axis-gimble, which allows to camera to be mounted in any position and still be adjustable to view any desired angle.
Keeping cost in mind, we recommend static dome CCTV cameras in most locations — unless a very high deterrent effect is desired.
PTZ Speed Domes: These are also dome shaped CCTV Cameras, but include pan, tilt and zoom capability. These cameras can be set up to follow pre-programmed routes and presets. Most applications include a joystick – keyboard, operated by surveillance personal. Ideal CCTV recommend Speed Domes for vast area projects like car parks.
Generally for reliable security we recommend to stick to static (non rotating) CCTV Cameras, as very often during important incidents the Speed Dome monitored another area and no evidence was captured.All security risk areas like gates, ground floor window rows, doors and fire exits should have their own static camera, zoomed in on the highest risk area.
IR Night-Vision CCTV Cameras vs Sens Up DSS Night Vision: Everybody speaks and writes about Infra Red Night Vision – but few people are aware that the majority of IR illuminated cctv footage is not usable for identification of suspects. Common problems are:
- IR too weak on distance but..
- ..too strong for close up suspects, which causes..
- over-illumination of faces and loss of facial marks. Often the face is shown as a white blurr
- images & video are recorded in Black and White only.
We at Ideal CCTV have changed our approach and turned to DSS Night-Vision. CCTV Cameras that incorporate this advanced light sensitivity require an absolute minimum of light. In some instances moon light or even star light can be sufficient to give a clear and crisp colour picture at night time. Ideal is the presence of a street lamp within fifty to eighty yards or the installation of one low-light source might be recommendable.
DSS night vision cameras deliver clear colour recordings in situations where the human eye hardly sees a thing.We do not recommend DSS CCTV Cameras in applications where fast moving objects like cars etc. are the main aim of surveillance.A security camera can come in many different styles including dome, bullet, infrared and c-mount. The security camera that will work best for your application will depend on several factors such as whether you will use the security cameras inside or out, during the day, nighttime, or both.
Bullet style security cameras are the most popular. They can be used inside or out. These security cameras come in black and white or color and come with all of the required mounting hardware. Some security camera casings are weather resistant and don’t require added external protection. Most security cameras have a fixed 6mm lens that allows you to see facial features out to about 30 feet and provides a 56 degree angle of view.
Resolution levels for black and white security cameras are about 400 lines, any higher and the benefits are minimal. For color cameras, the higher the resolution the better. Infrared security cameras are also very popular as they allow an image to be seen in little or no lighting conditions. Most infrared security cameras are bullet style and can be used inside or out. The cameras have infrared lighting installed around the outer edge of the lens which allows the security camera to see in no light.
The advantage to c-mount security cameras is that the lens can be changed. You’ll want a special camera lens if you need to see further than 35 ft. The colour c-mount security camera allows you to change lenses on the camera giving you the ability to zoom into a particular area. Varifocal camera lenses allow you to adjust the focus from 5 to 50 mm. These lenses can be used inside only unless you put it in special housing for outdoor use.
Dome security cameras basically provide a different look. Everyone has seen these security cameras in businesses and stores. Because of its shape, its difficult to tell exactly where the camera is aiming unless you see it up close. Dome cameras are generally used inside buildings
Dome Cameras: The dome camera is obviously named for its dome shape. Everyone has seen these security cameras in businesses and stores. Because of its shape, its difficult to tell exactly where the camera is aiming unless you see it up close. Dome cameras are generally used inside buildings, although the armor domes can be used outside as well (more about the armor dome below). You can mount them on the ceiling or on a wall. They are available in black and white (b/w) and color, and the basic unit has good video resolution (400 lines for b/w, 380 for color).
Varifocal dome cameras feature the highest quality SONY 1/3” Super HAD CCD sensor and excellent resolution (420 lines). The 5-8mm model has an adjustable lens focus from 5mm to 8mm. The 9-22mm model can adjust its lens focus from 9mm to 22mm. Refer to the security camera lens FAQ for more information about lenses and focus.
Infra Red Cameras: An infrared security camera has infrared LED lighting (light from a different region of the electromagnetic spectrum than we normally use to see) installed around the outside of the lens of the camera. This lighting allows the camera to capture a good image in no light at all. With a little bit of light (called low light) the infrared camera can capture a picture that looks just like daytime. People use infrared security cameras for businesses that have the lights out at night (in case of break-ins). Or for outside, nighttime viewing. Keep in mind that even at nightime there is a normally some light from the moon, stars, or street lights.
Infrared cameras are often called “Night Vision” cameras because they can ‘see’ at night. However, do not confuse “Night Vision” with “Day / Night Cameras”. Day / Night cameras do not have infrared lights built in. More about those types of cameras below.
Infrared security cameras will provide a color picture while the light is good. When it gets dark, the camera will switch to infrared mode and illuminate it’s built-in infrared LEDs. In infrared mode the image is captured in black and white – this is true of all infrared cameras. The level of light required to capture a good picture is referred to as a camera’s lux, the lower the lux the better the camera can see in low light. For example a camera with 0.003 lux is better than a camera with 0.2 lux. Infrared cameras are considered to be 0.0 lux in infrared mode – in other words they can ‘see’ with no light at all. Infrared cameras are also compared by how far they can see in total darkness. This is generally a result of how many infrared LEDs are built into the camera. Our Long Range Color Day/Night Weatherproof IR Camera can see up to 150ft. with no light at all!
If you are going to use an infrared camera outdoors, its best to use a outdoor weatherproof bullet style camera. This is because if you use an indoor infrared camera and need to put it in an outdoor housing, sometimes the infrared light reflects off the glass of the housing. Some people get acceptable results if the camera is absolutely flush up to the glass thereby reducing the glare. An alternative solution is to use a day / night camera which has an extra sensitive imaging chip that allows it to capture a good picture in low light situations without using infrared lighting. This works well for example if there are street lights outside or an exterior light that can be left on at night. Keep in mind that cameras without infrared lighting will not capture an image with zero light. The other issue to consider is that infrared cameras require more power (more amperage). The power requirements are provided in the specs for each camera.
Bullet Cameras: The term Bullet Camera comes from its resemblance to a rifle bullet. Generally long and tapered like a cylinder, it looks like an oversize ammo cartridge.
Most bullet cameras come with a fixed 3.6mm lens that allows a 80 degree angle of view. This is the widest angle you can have without distorting the picture. A 4mm lens will allow you to see facial features out to about 35 feet. If infrared is included you can generally see 35 feet minimum with no external lighting, some can see up to 70 feet.
Some devices capture images in color which is best for daytime lighting. For nighttime viewing choosing an infrared camera, which captures images in black and white is better. Many of the products will display color during the day and automatically switch to black and white infrared viewing when light levels are low. Resolution levels for black and white are usually about 400 lines, any higher resolution and the benefits are minimal. For color, the higher resolution the better the picture.
Used in closed circuit television applications, bullet cameras contain essentially the same electronic components as c-mount cameras but have been modified to fit in a weatherproof casing for outdoor use. You can see from the image that some models allow the housing to be removed for installation indoors. Mounting brackets are included with each item. They can be installed on the ceiling or the wall. Voltage is 12V DC. Power adapters are included with every camera.
C-Mount Cameras: The advantage to a c-mount camera is that the lens can be changed. If you need to see further than 35 or 40 ft then you’ll need a c-mount camera with a special lens. C-Mount lenses are available from 4mm to 50mm. A 4mm lens provides facial detail and a 70 degree angle of view focused up to about 35 ft. An example of where you might use a fixed 4mm lens is in a small office, or at home to focus on your driveway.
A higher millimeter lens will provide further distance, but narrows the field of view. So, a 16mm lens would provide about a 15 to 20 degree angle of view at a focus distance of about 35 ft (or a 70 degree angle of view at about 140 feet). In general, a 8mm lens is like a 4mm lens zoomed in 2 times. Similarily, a 16mm lens is like the 4mm lens zoomed in 4 times.
Many times, the best option is to use a varifocal lens. This will allow you to vary the focus from 5 to 50mm. So when you install the camera you can fine tune the focal distance and angle of view. An example of where you might use a varifocal lens is outside (or inside) a large commercial building where you need more distance than 35 ft. and the varifocal lens will allow you to adjust the focal distance to your preference. If you want to use cmount cameras outside, you must put them in an outdoor camera housing
CCTV lenses are available in two different lens mounts. “C-mount” lenses have a flange back distance of 17.5mm; “CS-mount” lenses have a flange back distance of 12.5mm. The flange back distance is the distance from the flange of the lens (beginning of the lens mount) to the focal plane. All of the C-Mount cameras we sell can be adjusted for installation of a CS-Mount lens as well as a C-Mount lens.