2 How far can an 8mm focal length be monitored?

A focal length of 2 8mm can monitor distances up to 3 meters.

Lens focal length. The length of the image determines the size, field of view, and depth of field.

and perspective of the image. The smaller the focal length, the closer the visible distance and the larger the field of view. The larger the focal length, the farther the viewing distance and the smaller the viewing distance.

Choose different focal lengths for different scenes. 2 8mm or 4mm lenses can be used for scenes with a larger field of view and a smaller object distance.

The 2 8mm lens can be used in the monitoring environment of small spaces such as warehouses, and the optimal monitoring distance is within 3m.

The 4mm lens can be used in indoor environments such as small shops or homes, and the optimal monitoring distance is 3 5m.

Generally, the estimated focal length * 1500 is the best object distance, that is, this distance is the clearest to see, and the unit is mm

Within 10 meters is an ultra-wide-angle head with a wide range.

Good monitoring of focal length. 1. The shorter the focal length, the larger the viewing angle: the larger the viewing range.

The longer the focal length, the lower the angle of view. The smaller the range you see. The millimeter value is small, the millimeter value of 4mm is large, and in comparison, the monitoring is closer than the 4mm monitoring, which is suitable for a small range.

The 4mm monitoring is more suitable for a large area, and the 6mm is larger.

2. It should be noted that the larger the millimeter value of the lens of the monitor, the farther you can see: but the smaller the effective angle of the camera, and the closer the angle is to the camera, it may not be within the effective range, because it is outside its angle.

3. The smaller the millimeter value of the lens of the surveillance camera, the closer you can see: but the greater or wider the effective angle of the camera, the closer the angle is to the camera, and you can also see it clearly, otherwise, it is not clear if you see it far. The field of view corresponding to different devices.

It is different, so the specific applicable distance will be different, and the actual parameters of the equipment need to prevail.

The above content refers to Encyclopedia - Security Camera.

Summary. Hello, happy to answer for you; The focal length of the lens refers to the distance from the main point to the focal point after the lens optics, which is an important performance indicator of the lens. The length of the focal length of the lens determines the size of the image, the size of the field of view, the depth of field and the perspective strength of the image.

When shooting at the same target at the same distance, the image with a long focal length is larger, and the image with a short focal length is smaller. Depending on the application, the focal lengths of camera lenses vary greatly, ranging from a few millimeters to a dozen millimeters to several meters long. When we talk about the focal length of a camera lens, we mean the focal length of the image square.

The focal length of home monitoring is still 60mm.

Hello, I am inquiring for you, please wait a while, I will reply to you immediately Hello, I am happy to answer for you; The focal length of the lens refers to the distance from the main point to the focal point after the lens optics, which is an important performance indicator of the lens. The length of the focal length of the lens determines the size of the image, the size of the field of view, the depth of field and the perspective strength of the image. When shooting at the same target at the same distance, the image with a long focal length is larger, and the image with a short focal length is smaller.

Depending on the application, the focal lengths of camera lenses vary greatly, ranging from a few millimeters to a dozen millimeters to several meters long. When we talk about the focal length of a camera lens, we mean the focal length of the image square.

Generally, there are even 25mm surveillance cameras for home use; The size of the focal length determines the viewing distance and the viewing angle, the smaller the focal length, the closer the viewing angle, the greater the viewing angle, and vice versa.

I hope the above is helpful to you If you are satisfied with me, please give me a thumbs up

Which is better, home monitoring focal length or 4mm.

Kiss! Hello, happy to answer for you;

It is better to have a focal length of 4mm for home monitoring, oh 1, there are even 25mm for general household surveillance cameras; The size of the focal length determines the viewing distance and the viewing angle, the smaller the focal length, the closer the viewing angle, the greater the viewing angle, and vice versa. The lens with a focal length of 8mm can be used in a monitoring environment in a small space such as a storage room, generally within 3m; 4mm can be used in large indoor environments, such as small shops in the living room, etc., with a distance of 3-5m; 6mm can be used in small shops or doorsteps and other scenarios, with a distance of 5-10m; 8mm can be used in outdoor road and alley scenes, and the best distance is 10-20m; 12mm is mainly used for specific locations such as entrances and exits, and the distance is about 20-30 meters; 1. The visual range is different. The viewing range is within 90 degrees, while the viewing range of 4mm is within 70 degrees.

2. The monitoring distance is different. The monitoring distance is 4 meters, while the monitoring distance of 4mm is 6 meters. 3. Imaging is different.

can see far away, but the image will be distorted and blurry, while the 4mm can see closely, the image will be clearer. Hope mine can help you <>

Do you have any other questions?

Differences: 1. The visual range is different, monitoring, the visual range is within 90 degrees, monitoring is 4mm, and the visual range is within 70 degrees.

2. The monitoring distance is different. Monitoring, the monitoring distance is 4 meters, the monitoring distance is 4mm, and the monitoring distance is 6 meters.

3. Imaging is different. Surveillance can see farther, but the imaging will be distorted and blurry; The monitoring 4mm has a relatively closer range to see, but the image will be clearer.

Summary. Look at things about 2 meters, look at things about 4 meters, and look at things about 5 meters if you look at things that are about 4 meters.

As far as the description is concerned, the focal length of the surveillance camera is different, and the distance that can be seen is different at the closest. You understand it this way, you look at things that are about 2 meters, you look at things that are about 4 meters, and you look at things that are about 5 meters if you look at things that are about 5 meters in 4mm.

The 6mm looks at things that are about 8 meters, and the 8mm ones look at things that are about 18 meters. The 12mm looks at a thing of around 30 meters.

Like the general used for corners, to see turns, doorways, objects within 2 meters.

4mm is used for most monitoring occasions.

Even higher ones are rarely used.

Summary. The camera in the surveillance 6mm focal length can see how far away you are dear, 6 6mm infrared camera, the range that can be seen is within 40m; The camera with the above specifications is a narrow-angle lens, and the range that can be seen is about 100m; The range that can be seen by a camera is about 150m. 4.

If it is a high-speed laser pan-tilt all-in-one machine, the range that can be seen is about 300m.

The camera in the surveillance 6mm focal length can see how far away you are dear, 6 6mm infrared camera, the range that can be seen is within 40m; The camera of the above specifications belongs to the narrow-angle Zen and Qi lens, and the range that can be seen is about 100m in Heling; The range that can be seen by the hidden camera is about 150m. 4.If it is a high-speed laser pan-tilt all-in-one machine, the range that can be seen is about 300m.

4 meters wide and 8 meters long, can you see it all?

Facade. Hello, can you clearly describe your problem?

OK. How much can you see 40 meters wide?