- 1 Which is better 2.8 mm or 4mm?
- 2 What does 2.8 mm lens mean?
- 3 How do I choose a CCTV lens?
- 4 How far can a 2.8 mm lens see?
- 5 What is the difference between 2.8 mm and 3.6 mm lens?
- 6 Which type of CCTV camera is best?
- 7 How far can a 12mm lens see?
- 8 What do different lens sizes mean?
- 9 How wide can a CCTV camera see?
- 10 What angle can a security camera see?
- 11 Does CCTV need Internet?
- 12 What are the sizes of lenses that are used in CCTV?
- 13 What is the maximum range of CCTV camera?
- 14 How far can a security camera see at night?
- 15 What is a 90 degree viewing angle?
Which is better 2.8 mm or 4mm?
Although it has more clarity at a further distance, the 4mm lens shows a similar scene to the 2.8mm. The main difference is the reduced angle of view which gives the illusion that objects are closer to the camera. A 4mm lens is useful for detection & identification.
What does 2.8 mm lens mean?
This is the difference in the fixed lenses on the unit. 2.8mm gives you the widest view and is generally the most common, 12mm gives a zoomed in image. So if you are putting the cameras in a tight room go with the 2.8 if you want to see down a long hallway or view far away go with a higher one.
How do I choose a CCTV lens?
If you have security camera in the office or home and you want to see as much as you can, you should go for 2.8 or 4 mm lens (makes a wider view). If you want to observe a limited area, like an entrance you should go for 6mm or 12mm (makes a narrow view and objects are closer).
How far can a 2.8 mm lens see?
In general a 5MP 2.8mm lens will offer you around 105° field of view and a 5MP 4mm lens will offer you an 87° field of view.
What is the difference between 2.8 mm and 3.6 mm lens?
A 3.6mm lens is designed to provide an approximate 78° field of view and is the perfect camera in most CCTV applications. Most people think that a 3.6mm lens won’t show a large field of view, but as you can see from the below images, there’s not a huge difference between a 2.8mm and 3.6mm lens.
Which type of CCTV camera is best?
Top 7 Types of CCTV Cameras To Suit Your Requirements.
- Dome Camera. The most economical among the lot, Dome camera is the basic type of security camera, which is meant for indoor installation.
- Bullet Type Cameras.
- C-mount camera.
- Day/Night CCTV Camera.
- Infrared/Night Vision CCTV Camera.
- Varifocal Cameras.
- Wireless cameras.
How far can a 12mm lens see?
At 12mm you will achieve around a 30° angle of view and identification at around 50 feet. The real trick is that this lens can be set to anywhere between those two different focal lengths.
What do different lens sizes mean?
What is Lens Focal Length. Focal length, usually represented in millimeters ( mm ), is the basic description of a photographic lens. The longer the focal length, the narrower the angle of view and the higher the magnification. The shorter the focal length, the wider the angle of view and the lower the magnification.
How wide can a CCTV camera see?
A 4mm lens offers a horizontal view of about 61.93 degrees in a CCTV security camera. So, you will be able to see up to 120 ft. wide area at a distance of 100 ft. with a 4mm lens.
What angle can a security camera see?
Wide angle cameras often have field of views between 60 and 110 degrees. More modern smart cameras tend to go beyond 110 degrees to provide a little more coverage. Cameras in this range are the best for smart security cameras, as they provide enough distance and width to cover an entire yard.
Does CCTV need Internet?
You can operate CCTV cameras without the internet, and what’s great is that they can even work without electricity. An internet connection is only required when the footage needs to be accessed remotely. Although using the internet has its benefits, it is certainly not a necessity.
What are the sizes of lenses that are used in CCTV?
We most commonly use the 2.8 mm focal length for domestic installations. Customers are generally trying to cover their entire property with 4-6 cameras so the wider field of view is required. Fixed Lens Camera:
|Lens Focal Length||Horizontal Field of View|
What is the maximum range of CCTV camera?
C-mount cameras can cover distances beyond 40 ft thanks to the possibility to use special lenses with these cameras, whereas standard CCTV lenses can only cover distances of 35-40 ft.
How far can a security camera see at night?
How far can a security camera see at night? This varies depending on the model of the camera and the technology it is using. Most cameras with infrared technology can see between 30 and 40 feet at night. High-end cameras that use advanced sensor technology can see up to 170 feet.
What is a 90 degree viewing angle?
The 90 ° field of view captures all of the objects but in lesser detail. As you can see in the example images above, the camera with 90 ° field of view captures all 3 objects in the scene, though each object takes up a small part of the camera image.