There are two main types of optical coatings for pvd coating machines,one is anti-reflection film, that is, by coating the front surface of the lens with multiple layers of transparent materials with different refractive indices and different thicknesses, the principle of optical interference is used to reduce the excess reflected light on the surface of the lens . After the lens is added with an anti-reflection film, the transparency of the light will increase, the wearer will feel that the glare is reduced, and the vision will be more vivid and bright. The other is to add hard film, mainly used for resin lenses. It is generally added to the front surface of the lens to enhance the anti-wear ability of the resin lens, and at the same time, the permeability of light is also enhanced. When cleaning the hard-coated lens, the user should first wash the front and back surfaces of the lens with clean water, and then dry it with a clean soft cloth. Be careful not to wipe the lens when it is dry.

        If the ordinary lens can be seen clearly, there is no need to add the film. If it is necessary, the resin lens can be added with an anti-reflection film or a hard film, and the glass lens generally only has an anti-reflection film.
       When light enters different transmission materials (such as air into glass), about 5% will be reflected. There are many lenses and refractors in optical sights, which can add up to 30% to 40% of the incident light loss. . Modern optical lenses are usually coated with a single or multi-layer anti-reflection coating of magnesium fluoride. The single-layer anti-reflection coating can reduce the reflection to 1.5%, and the multi-layer anti-reflection coating can reduce the reflection to 0.25%, so the whole aiming If the mirror is properly coated, the light transmittance can reach 95%. Lenses with a single AR coating are usually blue-violet or red, and lenses with multiple AR coatings are light green or dark purple. pvd coating machine coating is commonly used on the surface of cameras, telescopes, microscope eyepieces, objective lenses, and prisms to increase the illumination of the image