High-definition CCTV lens, also called super megapixel lens. has the advantages of high definition, strong spectral transmission ability. And more precise workmanship compared with ordinary lenses. Generally, the center of the imaging circle of the lens and the resolution of the 0.7 field of view are used as the criteria for judging the sharpness of the lens. The center of the imaging circle and the field of view of 0.7 can reach 1000TVLine or higher, which is called a high-definition lens.
The lens itself is a high-precision optical device, especially for high-definition CCTV lenses. The key to the high-definition performance of HD lenses is the key technology:
Traditional spherical technology has developed to this day, and its design technology and manufacturing process are quite mature. And it has been widely used in almost all areas of the optical industry. However, when designing complex high-definition lenses, the imaging effect of spherical technology cannot reach the best. Aspheric technology can correct spherical aberration and greatly improve the imaging quality of the lens.
The shape of the aspherical lens is precisely calculated and molded by a precision machine. A single aspheric lens can achieve the effect of correcting aberrations of multiple spherical lenses. The lens adopting ultra-precision molding aspherical lens can effectively reduce the size of the lens while making the lens’s imaging clearer, better light transmission, and more accurate color reproduction.
Multi-layer broadband anti-reflection coating technology can maximize the light transmittance of the lens and reduce the residual reflection of light on the surface of each optical lens. This technology can reduce the visible light reflectance of the glass and air interface to less than 0.5%, while reducing the reflectance of near-infrared light to about 1%, as shown in Figure 3. Through the high-quality coating, unnecessary stray light and ghosts on the image are reduced, the transparency of the picture is effectively improved, and a reliable high-definition effect is also guaranteed.
Ordinary CCTV lenses are also designed to correct the aberrations of different wavelengths of light (red, green, and blue), but usually focus the two red and blue lights at the same position, but focus on the green It still does not overlap, that is, there is aberration in the secondary spectrum, which limits the further improvement of the lens imaging quality.
In order to correct the secondary spectrum, such as Hikvision CCTV HD series lenses, ultra-low-dispersion optical glass materials are widely used. Using their dispersion characteristics different from conventional optical glass, red, green, and blue color lights can be focused to the same color. On a flat surface, the lens HD performance is better.
For high-definition zoom lenses, the quality of their imaging depends largely on the accuracy of the zoom cam. Through the rotation of the cam, the zoom and focus group lenses are moved back and forth, so that the continuous change of the focal length and the adjustment of the focus point are achieved. If the accuracy of the cam is not good, in the process of zooming and focusing, a shift or tilt of the optical axis of the lens will inevitably occur, resulting in a serious reduction in imaging quality.
Before the advent of 4K ultra-high-definition technology, mainstream HD CCTV cameras had fewer than six million pixels. The advent of 4K ultra-high-definition technology has put forward higher requirements on the resolution of the lens. The design and manufacturing of 4K lenses will increase a lot. Even Japanese lens manufacturers have only launched a few 4K lenses.
As security CCTV lens becomes increasingly high-definition, networked, and intelligent, the application scope of cameras is becoming more and more extensive. Many places with poor monitoring conditions and dim light require the installation of multifunctional cameras. Especially low-light HD cameras to meet Demand for 24/7 monitoring. For low-light environments such as night, if the camera does not collect enough light. it will cause the picture to be very dark and affect the clarity. One of the key technologies is to improve the low-light performance of cameras.
At the same time, this CCTV lens uses constant aperture technology. When used at any focal length in the full focal range, the maximum aperture value of the lens is 0.95. In dark environments such as at night, the constant super-large aperture technology makes the monitoring screen brighter. thereby ensuring high-definition monitoring at night.
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