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Optical filter
CPL filter (CircularPolarizer) is a circular polarizer, which can generate circularly polarized light (when used in the forward direction), and can test the polarizer of circularly polarized light (when used in the reverse direction).
The full name is: Circular-Polarizing Filters, namely circular polarizing filter. Mainly used to eliminate polarized light, increase color concentration, deepen the blue sky, highlight white clouds, and eliminate reflected light from non-metallic surfaces such as glass or water. It is also possible to reduce the soft focus caused by atmospheric haze in landscape shots without changing the tonal balance of the entire picture.
Linearly polarized pound is also known as ordinary polarizer, its English symbol is L-PL (UnearPolaxizer) or PL-L (PolarizingF, ilter-Linear), PlLineat, PL, POL, CPL.
CPL structure: It is divided into two pieces. When using, the back piece is screwed in front of the front lens of the lens, and the front piece is rotated. Different angles have different effects on metering and saturation. Generally, it is 90 degrees from the light direction. Use it in the direction of , the effect is maximized. Generally, the exposure will be reduced by 2 stops, and the saturation will be affected at the same time. But be careful, if you want to shoot beautiful reflections in water, or metal highlights, don't use it, it will eliminate these reflections, you won't get the image you imagined; but if you want to shoot swimming fish in the water, Or pond algae, or exhibits in the window, CPL is a good choice. Shooting portraits with CPL will eliminate the highlights on the face, reduce the contrast, and make the face look flat. It depends on whether you need special effects. CPL adjustment requires a free hand, so it is best to use it with a tripod and a shutter release.
The role of CPL polarizer: The polarizer can eliminate harmful reflected light and improve the clarity and expressiveness of the image. Eliminate Reflected Light: Eliminates reflections of light from glossy surfaces such as water or glass. Increase Color Saturation: Can make blue sky, green leaves, mountain ridges and buildings more vivid. The circularly polarized CPL is specially used for AF focusing cameras and digital cameras, and it is more convenient to rotate and adjust. In addition, it is also compatible with the MF manual body.
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