What is the material of resin filter for photography?

According to different materials, common color filters can be divided into three types: color film, glass sandwich film and colored glass:

Color film filter

Color film filter is a special kind of color transparent chemical film. Its advantages are high transparency, various colors, low production cost, and the size can be cut as required. It has applications in movie cameras, cameras and magnifying glasses. However, it has no anti-pollution protective layer, which is easy to stain and damage, and it is easy to fade when it meets high temperature, so it is not suitable for long-term use.

Glass sandwich filter

The glass-sandwiched color filter is formed by bonding two colorless glasses and a colored film. Its advantages are high transparency, many grades of pigments made by chemical methods, high absorption and passing ability for various colors of light, and easy wiping and storage. Widely used in film photography and color enlargers, there are also many such filters in cameras. The film sandwiched between two pieces of glass, such as damp or vibration, is easy to glue or deteriorate the lens; Two pieces of glass are thick when they are bonded together. If the glass is not polished well, it may also cause the focus of the lens to change and affect the clarity of the image.

Colored glass filter

The colored glass filter is made of colored optical glass with excellent texture by grinding. Its advantages are high transparency, thin grinding thickness, unchanged lens focus, and strong ability to absorb and pass various colors of light, even if it is wet and heated. This color filter is widely used in modern photography. However, due to the color modulation process of colored optical glass, its various pigment grades are not as many as those of color film and glass sandwich filter.

The most common of the above three kinds of filters are colored glass filter and glass sandwich filter. In addition, there is a liquid color filter, which injects colored liquid into a transparent instrument, and the shade of colored liquid can be modulated at any time according to international fixed standards. This colored liquid container is placed in front of the camera lens to adjust the tone of the subject. This color filter is specially used for special photography in the science laboratory.