Analysis: Five key technologies of high-definition megapixel lenses

    High-definition megapixel lenses have the same technical principles and characteristics. However, most security professionals may only know about aperture, focus, zoom, anti-vibration, infrared filter and servo motor of electric lens, but may not know much about some key technologies inside the lens; and these inconspicuous technologies are often the key to affecting the quality of the lens.

    Low Dispersion Lens (LD, Low Dispersion or UD, Ultra low Dispersion) Technology

    This lens technology is usually used to control the chromatic aberration of the lens and improve the color reproduction effect of the photo. This technology can stabilize the spectrum produced by the refraction of light, that is, the color aberration of the color light after refraction through the lens is small, and the image color is almost the same as the original color. LD is usually used more in monitoring, and Japanese products adopt more in this part.

    Lens coating technology

    This technology can offset the reflected light of the lens on the lens. Its function is to eliminate ghosting, glare and resist the light spots produced by refracted and reflected light. At the same time, it can reduce the reflectivity of the lens and increase the amount of light entering the lens. This technology is used in surveillance lenses, but the technical capabilities of lens manufacturers in this area vary greatly. Therefore, in many cases, this can be used as a reference for lens selection. In addition, users probably only know whether there is a coating on the coating part of this lens, but they don’t know how many layers of lens coating there are and how they are different. Lens coating can be roughly divided into nano coating (Nano), integrated coating (Integrated Coating), subwavelength coating (Subwavelength Coating), multi-layer coating (Multi Coating), transparent coating (Transparency Coating) and BBAR multi-layer coating, HFT coating and other types, which may not be used in surveillance. At present, surveillance lenses are mostly BBAR and Nano, and the rest are mostly used for DSC or SLR camera lenses.

    High light transmittance lens technology (FluoriteFL)

    This lens technology is more commonly seen in telephoto lenses and high-magnification telephoto lenses of high-end cameras. It is also known as fluorite chip lens. It has very low refractive index and LD dispersion, which prevents the lens from producing lens reflection dispersion problems when zooming in to take a distant view. This lens is widely used in Japanese point-and-shoot lens series products.

    High Refractive Index (HRI) Technology

    This type of lens is quite special. It uses the lens's special polarization correction technology to effectively correct the polarization imaging difference generated when light enters the lens and reduce optical aberrations. This part can make the lens smaller and lighter. It is usually suitable for DSC or monitoring On-Bosard board lenses. However, the actual effect on monitoring is not high and is less concerned by monitoring lens manufacturers.

    Multi-focus imaging technology

    This new technology has been successfully applied to digital cameras DSC in 2012. This multi-focus imaging technology has a breakthrough application development, which is to allow the lens to have multiple imaging points at the imaging point. In real-time capture, if there is no clear image recorded or captured, this technology can restore the clear focal point in the subsequent image playback or captured photos. This has made a historic breakthrough in the post-event evidence in monitoring applications, but it has not yet been widely used in monitoring lenses. I believe it will be used in monitoring lens technology in the near future. Low-dispersion lenses and aspherical lenses of monitoring lenses will be applied to this technology.

    The above are some key technical descriptions in lens application. I believe that this is a technical part that many users have not come into contact with. Through this description, we can also get more reference information in lens selection.