With the development of science and technology, the application of filters is more and more extensive, and the requirements for products are more and more high. We need to have a certain understanding of the product before we can use it better.
The filter mainly uses the interference principle of light to obtain the transmission function of spectrum, and deposits the films with different refractive index on the optical substrate through the vacuum coating machine to achieve different optical effects. When a variety of wavelengths of mixed light pass through this product, due to the different refractive index, the interference effect will be produced, resulting in a very high transmittance of specific wavelengths of light and reflection and absorption of other wavelengths of light.
Filters play an important role and are widely used in photography. Why is the main feature of some landscape paintings shot by Master Photographers so prominent? How is it achieved? It is because of the use of this product. For example, if you want to shoot a yellow flower with blue sky and green leaves in the background, you can't highlight the theme of "yellow flower" if you shoot it as usual, because the image of yellow flower is not prominent enough. However, if a yellow filter is installed in front of the lens to block the green light from some green leaves and the blue light from the blue sky, and let the yellow light from the yellow flower pass through in large quantities, then the yellow flower is very obvious, highlighting the theme of "yellow flower".
The product refers to coating one or more layers of dielectric film or metal film on optical element or independent substrate to change the characteristics of light wave transmission. Using the characteristics of light wave in the transmission of these films, such as transmission, absorption, scattering, reflection, polarization, phase change, and so on, to design and manufacture various products to achieve the purpose of science and engineering applications. Manufacturing and copying technology is a complex engineering technology, involving many professional technical fields, including vacuum acquisition technology, true dragon measurement technology, computer-aided design technology, optical property detection technology, electronic circuit technology, material property detection and preparation technology.