Large zoom electric zoom lens

Zoom in, and the world zooms in; don't you want to know what's happening "thousands of miles away". "Clairvoyance" is no longer just a myth, the ideal large zoom electric zoom lens allows you to obtain "clairvoyance" anytime, anywhere. 1 zoom lens The zoom lens refers to the continuous change of the focal length of the system by changing the distance between two or more lens groups of the system when the image surface remains stationary, and when reaching a small magnification and a large field of view, the purpose and the large magnification and contempt field are found. Identify the purpose of the purpose. In the electric zoom lens, electric power refers to the use of the DC motor that comes with the lens to complete the functions of zooming, focusing, and switching between day and night or fog penetration during remote manual control or program setting. In the security monitoring industry, the electric zoom lens is the first type of zoom lens that can remotely adjust the focal length and focus. According to the number of variable components, the power zoom lens can be divided into: two variable power zoom lenses; three variable power zoom lenses. Two variable electric zoom lens means that the focal length and focus can be changed by the motor, and the aperture is automatically controlled by the camera drive signal, that is, the automatic aperture. The three-variable electric zoom lens means that the three parameters of focal length, focus, and aperture are all driven and changed by electric motors. The magnification or zoom ratio and zoom ratio in a zoom lens refer to the ratio of the focal length at the telephoto end to the focal length at the short focal end. Zoom lenses with a magnification of more than 10 times are generally referred to as large-magnification zoom lenses; rsely, zoom lenses with a magnification of less than 10 times are generally referred to as small-magnification zoom lenses. There are three main categories of zoom lenses according to the maximum imaging circle size: 1/3", 1/2" and 1". 2 Application of zoom lens The selection criteria of the zoom lens are as follows: the maximum imaging circle size of the lens should not be smaller than the imaging specification of the camera chip, that is to say, a 1/2” lens can be used with a 1/3” camera; but a 1/3” lens cannot be used. It should be used on a 1/2" camera, as it will cause blurry edges and vignetting problems. When the motorized zoom lens is used in conjunction with the camera, the functions of zoom, focus and aperture can be controlled manually through the back-end controller or the control interface of the camera. The magnification of the power zoom lens is 6 times, 7 times, and 10 times. The focal length of the telephoto end is mostly below 100mm, which is called a short focal length type of power zoom lens; 15 times, 16 times, 20 times, 22 times and other medium magnifications , Most of the focal lengths at the telephoto end are between 100mm and 300mm, which are called medium focal length electric zoom lenses; further up there are 30 times, 33 times, 50 times, 60 times, and the ordinary focal lengths are more than 300mm, and some even It can reach or exceed 1000mm, which is especially suitable for ultra-long-distance monitoring. It is called a telephoto zoom lens. After a period of selection, the motorized zoom lens with a focal length of less than 200mm at the telephoto end was basically replaced by a movement lens; the motorized zoom lens with a focal length of 200mm to 1000mm at the telephoto end was especially suitable for long-distance and ultra-long-distance monitoring. Project use is still widely used. In rivers, highways, urban commanding heights, railways, forest fire prevention, airports, border defense, coastal defense, ports and other monitoring projects that require large-scale, long-distance, and ultra-long-distance monitoring, a motorized zoom lens with a large magnification and long focal length is generally used. This type of monitoring project, in the monitoring system, sometimes needs to achieve seamless monitoring in a large range, which is completed through the relay of multiple monitoring points, in which the monitoring distance of a single camera generally needs to be about 1-10 kilometers. In order to be able to complete 24-hour high-definition day and night monitoring in harsh weather environments such as dust, smoke, rain and snow, it should also have the function of fog penetration, that is, the lens in the 700nm ~ 950nm infrared band has a high transmittance, and at the same time Equipped with a fog filter, so that in the fog mode, the principle that near infrared rays can diffract tiny particles is applied, and a very clear, high-contrast black and white image can be captured, and the effect of long-distance observation is improved. Common electric zoom lenses will encounter some problems that need to be dealt with in the application: 1. Since telephoto lenses are mostly used in all-weather surveillance environments, the application of automatic aperture technology is essential. The accompanying problem is that the depth of field changes from time to time with the adjustment of the aperture, especially at night when the aperture is fully opened, so that objects that can be clearly observed during the day may become blurred at this time. 2. In addition, the telephoto lens has brought us more and more common observation scenes. In the same picture, the near, medium and long-range objects may appear at the same time, and the monitoring of objects at different distances may be suspended. Usually, what the monitoring personnel need to do is to stop and focus the lens from time to time to achieve the ideal observation effect. 3. In medium and long-distance monitoring, some scenes will show weather conditions such as heavy fog that block the field of vision. Power zoom lenses are mostly used in wider outdoor scenes, and generally cover a larger focal length range. Since the focal length can be changed by human operation, the key parts in the scene can be zoomed in and observed, and the monitoring effect is very good. With the continuous development and improvement of the security industry and the increase in the country's investment in outdoor infrastructure, such as smart cities, highways, railways and bridges, forest fire prevention, coastal defense, dams, ports, border defense, oil fields and other industries and fields about electric zoom lenses demand has grown significantly.