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镜片表面镀有多层减反射膜后，镜片特别容易产生污渍，而污渍会破坏减反射膜的减反射效果。在显微镜下，我们可以发现减反射膜层呈孔状结构，所以油污特别容易浸润至减反射膜层。解决的方法是在减反射膜层上再镀一层具有抗油污和抗水性能的顶膜，也就是大家所说的 防水膜。而且这层膜必须非常薄，以使其不会改变减反射膜的光学性能。
After the mirror surface is coated with multi-layer antireflection film, it is easy to produce stains on the lens, which will destroy the antireflection effect of the antireflection film. Under the microscope, we can find that the antireflection coating is porous structure, so oil is easy to infiltrate into the antireflection coating. The solution is to coat the antireflection film with a top film with oil and water resistance, which is known as the waterproof film. And the film must be very thin so that it does not change the optical properties of the antireflection film.