How to avoid color cast when taking pictures with polarizer?

When taking pictures with polarizers, you must master the skills of avoiding color cast.

When the polarizer is used to take landscape photos, it has an excellent effect on the performance of clouds. The refractive index of light in the blue sky is greater than that of light scattered by white clouds. Using polarizer can also make the color of green leaves more saturated and eliminate the fog of low-angle shooting of urban scenery.

Polarizers are not everything. If the angle of sunlight is not appropriate, the glare reflected by non-metallic surfaces may have a small polarized light component. For example, photographing leaves often cannot eliminate all reflections. If you use a super wide-angle lens, it is difficult to achieve consistent results. Especially when shooting the sky, the direction at an angle of 90 degrees with the sun is very dark, while other directions have little influence, resulting in uneven color and brightness of the sky. When shooting the water surface, some water surfaces do not reflect light, and some water surfaces reflect light very strongly. The polarizer has a rotating part and is relatively thick, which may block the angle when used in a super wide-angle lens. When using a polarizer, don't use a hood because you need to turn the filter. You should try to shoot the camera in the shadow.

It takes some skill to use a polarizer well. For example, when shooting the sky, you can use your right hand to orient your thumb and forefinger at 90 degrees, with your forefinger pointing to the sun and your thumb as the best shooting direction. In addition, because the polarizer will lose the aperture of 1/2 to 2 when the polarization effect is the best, exposure compensation is needed, and generally the exposure of 1 2 will be increased. For the reflection of the metal surface that cannot be filtered, a large polarizer can be added in front of the light source to make the light reflected by the metal polarized, and the reflection of the metal surface can be filtered by the polarizer. However, in portrait photography, it is best not to use a polarizer, because it will filter out the reflection of the face and make the face lose its three-dimensional sense.