Readers ask: What Does 2.8-12mm Mean On A Cctv Camera Lens?

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What does a 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.

What angle of view is 2.8 mm?

2.8mm for a 90° view With a wide field of view, the 2.8mm lens is a popular choice for static camera surveillance. It can cover a wide area with just one camera. The 2.8mm lens is very popular indoors.

Which is wider 2.8 mm or 3.6 mm?

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.

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What is the field of view for a 2.8 mm lens?

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.

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 is the viewing angle of CCTV camera?

The Different Viewing Angles For Your Camera Standard/Medium: Lenses covering a viewing angle of 60 to 25 degrees, representing an effective focal length of 25mm to about 65mm. Telephoto: Lenses which cover a viewing angle of 25 to 10 degrees, which corresponds to a focal length of 65mm to 160mm.

Why is angle of view important?

Answer: An angle of view is valuable because it gives your design way more exciting. An informal way to do this is by bending your knees to get below the subject. Explanation: It is essential to identify the angle of view from the aspect of coverage, which represents the angle scale that a lens can image.

Which type of CCTV camera is best?

Top 7 Types of CCTV Cameras To Suit Your Requirements.

  1. Dome Camera. The most economical among the lot, Dome camera is the basic type of security camera, which is meant for indoor installation.
  2. Bullet Type Cameras.
  3. C-mount camera.
  4. Day/Night CCTV Camera.
  5. Infrared/Night Vision CCTV Camera.
  6. Varifocal Cameras.
  7. Wireless cameras.

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.

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What do mm in camera lenses mean?

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 far can the average surveillance camera see?

A home security camera usually can see in a range between 0 to 70 feet depending on the resolution, sensor and lens it’s using. However, there are also professional cameras such as high-resolution PTZs that can see further away, with a distance that varies from 0 to 700 feet.

How is CCTV field of view calculated?

A simplified calculation for 1/4-inch CCTV lens can be made using the following formula:

  1. W (horizontal width) = (distance) * 3.2 mm / (Lens Focal Length)
  2. HorizontalAngle= 2 * arctan(SensorSize/(FocalLenght * 2))
  3. Watch Video Tutorial.

What is focal length 2.8 mm?

Feb 20, 2017. It refers to the distance from the image sensor to the lens. The further away from the sensor the lens is, the narrower the angle at which light hits the sensor, making the field of view narrower. We explain it further here. Reply.

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.

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