How to choose the focal length of the camera?

The first thing to understand is the relationship between focal length and actual imaging. According to the imaging principle,camera news，  the focal length of the lens is inversely proportional to the horizontal angle of view. .At this point, you need to choose the most suitable lens focal length according to your specific monitoring environment.


A wide-angle lens has a wide angle of view, but because of its short focal length, the angle of view is not too far, and you cannot see clearly at any distance. So this camera with a wide viewing angle but not too far is ideal for small spaces such as elevators.


A long focal length can produce sharp portraits even at long distances, but correspondingly, the range of possible imaging angles is narrower, making it more suitable for long-distance shooting. Aisles and corridors.


Therefore, there is no best, only the most suitable. The choice of lens focal length depends on the characteristics of the space you want to monitor and the shooting distance. Each focal length lens can only achieve the best results within a certain range. On the other hand, if you want long range and great range, your best bet is to increase the number of cameras, which are usually more expensive.



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