There are many types of optical glass, and a filter is one of them, which can change the direction of light propagation. Optical filters are widely used in lenses, prisms, etc. of optical instruments. The filter meets the requirements of light imaging, so the quality of the filter is very high.

There are two types of filters in installation and use. One is the colored or colorless optical glass used on the lens, which can be called a filter. This kind of filter can be divided into black and white photography filter, color photography filter color, black and white photography common filter, special effect filter according to its photography purpose. The other is the flash filter used in front of the flash to adjust the overall or partial tones of the subject to produce special colors.