How do you calculate the focal length of a CCTV camera?

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

W (horizontal width) = (distance) * 3.2 mm / (Lens Focal Length)
HorizontalAngle= 2 * arctan(SensorSize/(FocalLenght * 2))
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What is focal length in CCTV?

The focal length is the gap between the image sensor and the lens. A CCTV Camera’s focal length is measured in millimeters (mm). This is the distance between the lens and the image that is required for a particular lens to produce a sharp image.

How do you find the focal length on a calculator?

Focal length = (Object distance / ((1 / Magnification) + 1)) * 1000 , where: Object distance is given in mm; and. Magnification does not have a unit.

How is security camera field of view calculated?

How to use this tool

Enter the distance to the object in the top field.
Enter the imager size of the camera. Enter 1/3″ for the image size standard CS mount case camera.
Enter the focal length of the lens.
Click the ‘Calculate’ button to see the horizontal (width) and the vertical (height) field of view.

How is CCTV storage calculated?

Storage Space (GB) = Bitrate (Kbps) * 1000/8 * 3600 * 24 * Cameras * Days/1000 000 000

*1000/8 = to convert kbps to Bytes.
*3600 = to convert from seconds to hour.
*24 = to convert from hour to day.
Cameras = total number of cameras.
Days = total number of days you want to record.

What is a 90 degree viewing angle?

Think of the field of view as the angle between the two horizontal edges of the camera image. The camera with 90° field of view is wider and captures more objects in a scene, though each object takes up a small part of the camera image.

What is focal length 3.6 mm?

The focal length (measured in “mm”) of a lens determines how far the camera can see. The most common focal length on security cameras is 3.6mm, which will allow for roughly a 72 degree field of view (FOV described below). This particular focal length works well for residential or small office surveillance applications.

How far can 8mm lens see?

A lens of 8 mm gives about 211 pixels per meter (PPM) and an image width (Field of view) of about 9 meters.

What is U and V in ray optics?

The distance between the object and the pole of the mirror is called the object distance(u). The distance between the image and the pole of the mirror is called Image distance(v). The distance between the Principal focus and pole of the mirror is called Focal Length(f).