The small camera of the surveillance camera still contains a lot of knowledge, but at the same time it is a part we often overlook. How much do you know about the surveillance camera? What is the difference between surveillance cameras? The following small series will analyze for you.
1, monitoring lens fixed focus and zoom points
In order to match different monitoring consoles, the lens can be divided into focus and zoom. The biggest difference is whether you have two rotatable screw buttons on the lens. Of course, in terms of price, the zoom lens is definitely more expensive than the fixed-focus lens; in terms of demand, it is still based on the actual application conditions of the user, and the zoom lens is not better than the fixed focus. Will I always adjust the lens?
For example, in most civilian surveillance, ordinary gun-type surveillance cameras are paired with the most conventional lenses. Generally, the analog surveillance camera selects a fixed focus lens, and some network surveillance cameras can be used with a zoom lens. The focal length can be changed according to actual needs.
2, monitor the shape of the lens
If you have to distinguish between the shape of the surveillance lens, Xiaobian suggests that you can adjust the focal length, that is, the two screw knobs on the lens. In general, the knob close to the top of the lens adjusts the focal length. The mainstream zoom focal length is 2.8. Mm~8mm, high-end surveillance camera zoom focal length span. The knob near the lens interface is used for focusing. When the focal length changes, the focus can be adjusted to the best position in time to capture the image.
In addition, even if there is still a big difference in the details of the zoom lens, this mainly depends on the monitoring host. Some surveillance cameras support the auto focus function. Therefore, there will be a line connected to the body on the monitor lens, and some zoom lenses. It is completely adjusted by hand, and the meaning of the lens with the same function is different in the appearance.
3, monitoring the lens interface disputes
What is the difference between the monitor lens interface? It is obvious that all the surveillance camera lenses are threaded ports. This interface is different because it is caused by different number of thread turns.
At present, the market mainly focuses on C-type interfaces and CS-type interfaces. The mainstream surveillance cameras are dominated by the CS circle. According to the data analysis, the principle of distinguishing different interface lenses is judged by the distance from the lens to the photosensitive surface: the distance from the mounting point to the focal point of the C-type interface is 17.5 mm, and the focal length of the CS-type interface from the mounting point is 12.5 mm. Compared with the former, it is more "dwarf".
There are different interfaces for the surveillance camera, so there are bound to be different types of surveillance cameras. For the purpose of distinguishing between the lens interface and the CS camera, the mashup is not recommended in principle. In order to solve the problem in practical applications, a 5mm C/CS adapter ring between the C-type lens and the CS camera can be used together. However, the CS lens cannot be used with the C-type camera.
Summary: Although the surveillance camera is no stranger to everyone, there are still many issues that we often overlook. Maybe you don't pay attention to the fixed focus and zoom of the monitor lens. You don't know the shape of the monitor lens, but only by knowing each accessory of the monitoring system can you combine the perfect video image. The difference between the monitor lens mentioned in this article is that everyone knows deeply. Way.
Fiberglass Measuring Tape,Fiberglass Tapes Measure,Fiberglass Tape Measure,Plastic Fiberglass Measuring Tape
Shangqiu Hengli Measuring Tools Co.,Ltd , https://www.henglimtools.com