What does the focal length of surveillance mean?
In the field of security monitoring, focal length is a key parameter, which directly affects the camera's field of view and imaging effect. This article will combine the hot topics and hot content on the Internet in the past 10 days to analyze the meaning, classification and selection suggestions of monitoring focal length, and help readers quickly master core knowledge points through structured data.
1. Definition and function of focal length
Focal length refers to the distance from the optical center of the lens to the imaging surface (unit: millimeter), which determines the field of view and magnification of the surveillance screen. Short focal lengths (such as 2.8mm) are suitable for large-scale monitoring, while long focal lengths (such as 12mm) are suitable for capturing long-distance details.
2. Hot topics related to surveillance focus across the entire network
| Topic keywords | Search popularity index | Related application scenarios |
|---|---|---|
| zoom security camera | 9,200 | Traffic violation capture |
| Focal length selection guide | 6,800 | home security |
| 4K telephoto surveillance | 5,500 | Border inspection |
| Intelligent focus adjustment | 4,300 | smart city |
3. Comparative analysis of focal length types
| Focal length type | Typical values | Viewing angle | Best distance to use |
|---|---|---|---|
| wide angle | 2.8-4mm | 80°-100° | 3-5 meters |
| Standard | 6-8mm | 40°-60° | 5-10 meters |
| Telephoto | 12-50mm | 10°-30° | More than 20 meters |
4. Popular monitoring focal length technology trends in 2023
1.Power zoom technology:Support remote adjustment of focus to adapt to the needs of multiple scenes
2.AI autofocus: Optimize picture clarity through algorithm
3.Multi-lens fusion: Wide-angle and telephoto lenses work together
5. Suggestions and precautions for selection
• For indoor environments, 2.8-6mm wide-angle lens is preferred
• It is recommended to use a 6-12mm zoom lens in the parking lot
• Highways require a telephoto lens of 12mm or above
• Pay attention to the matching relationship between lens focal length and sensor size
6. Typical application scenario data
| scene | Recommended focal length | Resolution requirements | average daily searches |
|---|---|---|---|
| supermarket checkout counter | 3.6mm | 1080P | 1,200 |
| Community entrance and exit | 6mm | 4MP | 2,800 |
| factory perimeter | 12mm | 8MP | 1,500 |
From the above analysis, it can be seen that the selection of monitoring focal length requires comprehensive consideration of monitoring distance, field of view requirements and environmental characteristics. With the development of intelligent technology, adaptive focus adjustment will become the mainstream direction in the future. It is recommended that users pay attention to the intelligence level and scene adaptability of the product when purchasing.
check the details
check the details
en
