How far can the focal length of the 6mm lens monitor

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vedard
Posts: 840
Joined: Wed Dec 05, 2018 12:27 am

How far can the focal length of the 6mm lens monitor

Unread post by vedard »

Each surveillance camera has a lens focal length, and different monitoring focal lengths correspond to different monitoring distances. As a common monitoring lens focal length of 6mm, do you know how far its monitoring distance is?
We know that the larger the focal length, the longer the monitoring distance, the smaller the lens Angle;On the contrary, the smaller the focal length, the closer the monitoring distance, the greater the lens Angle. At present, the focus length of the surveillance camera commonly seen on the market can be roughly divided into: 2mm, 4mm, 6mm, 8mm.
The effective monitoring distance of the focal length of the 6mm lens is about 5 meters to 18 meters, but the monitoring is for the purpose of security. It is necessary to see the monitoring distance of the face clearly, about 5-6 meters, and see the character features clearly about 12 meters.This means that 5-18 meters is a 6mm focal length monitoring range, and the effective monitoring distance for seeing a face is 5-6 meters.
Therefore, the focal length of 6mm surveillance camera lens is not suitable for installation in ordinary indoor, such as ordinary shops, families, etc. It is more suitable to be used for outdoor installation or large indoor environment, such as shopping malls, warehouses, etc.
security camera focus length.jpg
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vedard
Posts: 840
Joined: Wed Dec 05, 2018 12:27 am

What should be the focal length of the surveillance camera lens in the conference room and office

Unread post by vedard »

According to different monitoring environment, how to choose the focal length of the monitoring camera lens? If the surveillance camera is installed in the office, what should the focal length of the lens be?
Many people feel that surveillance cameras should cover as much area as possible. But the monitoring camera requires a large angle monitoring area, and at the same time there should be monitored details, which is difficult to achieve for ordinary surveillance cameras. Generally speaking, the milli-meter of the surveillance camera lens in ordinary scenes can be roughly divided into: 2.8mm, 4mm, 6mm, 8mm, 12mm, etc. As for how much the focal length of the lens should be selected, it should be determined by customer needs and meet the shooting needs of various indoor and outdoor environments.
As for what kind of scene to choose how big the number of millimeters, the suggestion is: 2.8mm for a narrower scene, such as elevator, floor pass room, etc.;4MM can be used in offices, conference rooms, shops on the street, etc., while more than 6MM can be used in workshops, warehouses, parking plants, residential gardens and other scenes.But this is only the recommendation of the theoretical value, the specific situation, or according to the site environment and the actual needs of customers to conclude.
The focal length millimeter of a surveillance camera lens is simply understood as: the larger the focal length millimeter is, the narrower the monitoring Angle of view is, but the larger the monitoring distance is.
meeting room security camera.jpg
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Shop Focus brand wireless alarm, HB solar power alarm, HST fire alarm at https://www.vedardalarm.com
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