Monitoring cameras pay attention to the quality and function of the match, today for you to focus on the analysis of how to identify the advantages and disadvantages of monitoring cameras.
One. look at the feeling
1. First look at the delicacy of the appearance of the monitoring camera lens, including the internal movement and external shell;
2. Feel the feel of the camera lens;
3. Look at the coating film and feel the light penetration of the monitoring camera lens.
Two. basic parameters Understand the matching degree of the monitoring camera lens
Why should we consider the size of the image when choosing a lens? Because imaging size is one of the important parameters to determine whether the camera lens (or SONY integrated camera) matches. We have learned that the commonly used imaging sizes of camera lenses generally include: 1/3 “1/2.7” 1/2.5 “, 1/1.8 “, 1/2 “2/3” 1 “and other specifications. If the lens size of the selected monitoring camera is smaller than the size of the camera target surface, the monitoring picture will appear dark Angle. If the size of the monitoring lens is larger than the target surface of the camera, the monitoring Angle of the monitoring picture will become smaller. The best fit is to match the size of the surveillance lens to the size of the camera’s target surface.
Three. The practical influence of three pass light quantity on the lens of surveillance camera
In a digital camera or camcorder, F number is the main index to judge the amount of light through the lens. It is the ratio of lens focal length to through-light aperture. In the case of fixed focal length, the larger the through-light aperture is, the smaller the F value is, indicating the stronger the through-light capability of the monitoring camera lens. Does a smaller F-number mean a better camera? For example, when the focal length of a surveillance camera lens is fixed, the F1.0 lens is self-evidently better illuminated than the F1.2 lens. But the real difference between F1.0 and F1.2 is only in low light. In a dark environment, a lens with a small F value may still be able to see a little image, while a lens with a large F value can no longer see the image. However, in practical applications, a little image observed by a lens with a small F value cannot achieve the purpose of monitoring. In practical engineering, to achieve real monitoring, it still needs to add supplementary light to meet the requirements. In good light, the difference is not obvious. To put it simply, in places with heavy traffic, such as school gates and subway exits, when it is necessary to see clearly the people in the left and right range of vision at the same time, the effect of F1.2 surveillance lens is much better than that of F1.0. In terms of cost, there is no 1:1.2 relationship between the input of F1.0 monitoring lens and F1.2 monitoring lens. The lenses of the SONY FCB-EW9500H range from F1.6 to F4.8, which can meet the strict requirements of surveillance cameras.
SONY FCB-EW9500H with HDMI 4K interface board