Circular polarizing filters, namely circular polarizing filters. It is mainly used to eliminate polarized light, increase color concentration, deepen sky blue, highlight white clouds, and eliminate reflected light on non-metallic surfaces such as glass or water surface. It can also reduce the soft focus caused by atmospheric fog in landscape photos, but does not change the tone balance of the whole picture.
Linear polarizer, also known as ordinary polarizer, is marked in English as l-pl (UNEAR Polarizer) or PL-L (polarizing F, ilter linear), pllineat, PL, pol, CPL.
CPL structure: it is divided into two pieces. When in use, the back piece is screwed in front of the lens group in front of the lens, and the front piece is rotated. Different angles have different effects on photometry and saturation. It is generally used 90 degrees from the illumination direction to maximize the effect. Generally, it will reduce the 2nd gear exposure and affect the saturation. However, it should be noted that if you want to take beautiful reflections in the water or metal highlights, do not use them. It will eliminate these reflections and you will not get the image you imagine; But if you want to take pictures of fish in the water, algae in the pond, or exhibits in the window, CPL is a good choice. Taking a portrait with CPL will eliminate the highlights on the face, reduce the contrast, and make people's face look flat. See if you need special effects. It is necessary to free up one hand during CPL adjustment, so it is best to use it with tripod and shutter cord.
Role of CPL polarizer: polarizer can eliminate harmful reflected light and improve image clarity and expressiveness. Eliminate reflected light: eliminate light reflected from shiny surfaces such as water or glass. Increase color saturation: it can make the blue sky, green leaves, ridges and buildings more colorful. Circular polarization CPL is specially used for AF focusing camera and digital camera, which is more convenient for rotation adjustment. In addition, it is also compatible with MF manual fuselage.
