The spots or stripes on the film layer of the filters generated

Definition and description of filters spots or stripes: When viewed from a non coated surface, there are irregular black spots or stripes on the coated filter surface. Generally, there are phenomena such as mold, paper marks, suction cup printing, tin coating on the original film, and watermarks

Causes: There are many cases of spots or stripes, mainly due to defects in the original film before coating, or improper storage and use after coating.

1. In terms of filter production:

Generally speaking, the production process of coated filters itself does not produce these defects, mainly due to the quality of the original film. For example, the appearance of mold and paper print on the original film that is not fresh; The suction cup and tin contamination brought by the original film itself; Water accumulation caused by poor cleaning of tempered or semi tempered filters; And the original film itself has been contaminated, which may cause spots or stripe defects in the coated filter product

2. Filter storage and installation:

Due to long-term exposure to damp and unventilated environments, or exposure to sunlight and rain outdoors, the filter may also become moldy or deteriorate, resulting in spots or markings

3. Filter film contamination:

Due to improper installation and cleaning, it is also possible to cause local contamination of the filter, resulting in spots or stripes on the filter. In addition, due to the failure of the filter to be cleaned in a timely manner, dirt such as dust and oil fumes can adhere to the surface of the filter for a long time, ultimately resulting in spots or streaks of pollution that cannot be washed off.

Hanzhong Borisun Optics specializes in producing filter manufacturers, providing you with high-quality filters and high-precision optical lenses. We also offer customized solutions for producing different filters and high-precision optical lenses. We have a rich library of 10960 filter selection options, allowing you to quickly and conveniently research and develop optical filter solutions, and ensuring that your filter procurement and delivery time is accurate and the quality is stable.



Hanzhong Brisun Optics Co., Ltd. Is the high precision optical element manufacturer provides customized production of Various optical lenses, including spherical lens, cylindrical lens, optical window, mirror, prism, filter, metal base mirror and other high-precision optical elements. The base materials include various optical glass, fused quartz, calcium fluoride (CaF2), zinc selenide (ZnSe), germanium (GE), silicon (SI), sapphire, metal and other materials. And provide antireflective film, high reflection film, spectroscopic film, metal film and other optical coatings.

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