By: tracy ma
Submitted: 2012-02-20 01:13:25 | Word Count: 479
Coated lenses use technologies of optical film and vacuum .It has a layer of material at the surface of the lens in order to improve the ability of the lens reflection light and enhance or reduce the role of light through.
There are two coated lenses in markets: the reflective filter. In the lens surface of gold, silver, zinc sulfide. Coating that reflects the protective effect of visible light, infrared rays and gamma rays from the eyes. The titanium dioxide antireflection increased lens piece. Lens-plated fluoride magnesium, silicon dioxide, aluminum fluoride, etc., can reduce the specular reflection, and to improve the transmittance of the lens. Appearance of the United States to help the photographer take pictures.
The advantages of coated glasses: clear, depending on the material to reduce the specular reflection, light transmittance. The lens coating to prevent the damage of ultraviolet, infrared, X-ray vision. Vision is not easy fatigue wear coating glasses, the vision of the screen before the staff can be protected. Coated glasses can reduce the reflected light of the lens surface to solve the problem of wear glasses under a bright light camera, an increase of beauty. The lenses can withstand a variety of adverse environmental, high temperature, rain, seawater immersion will not fall off. To rub the lens, like grease lenses, available neutral detergent, rinse, and should not be dry-erase.
More common in China, broadband green film, decorative film Green, red membrane and blue film, the purple membrane and the yellow film: broadband green film: in some places also called AR green film, is currently China's best coated one observed at different angles will show different ribbon (this is the performance of the multilayer coating), high-definition imaging and color reproduction is also good. The red zinc oxide film is generally used only for the red dot, this is more generic, no features. The blue film is China's use of the most widely used coating method, compared to broadband green film look slightly out some yellow and dark blue film layered number, and some plated three-tier, a good five-story, only a layer of . Decorative color of the green film and the antireflection green film is very similar, but optical performance is nothing to boast, it is easier to identify the decorative green film reflective great broadband light green film.
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All in all, a good lens and coating is very light. The overall transmittance is 85-90%. If the internal lens use coating lens, then the overall light transmission rate can reach about 93% (relatively rare in China). But broadband green film lens is more or less edge and a little bit virtual in China. In order to achieve higher light transmission rate, the internal lens coating can be used to improve optical performance and make the overall transmission rate reach 93-95%.Source:http://www.mhcocm.com
