Absorbing blue light can produce romantic sky effect or moonlit effect when shooting during the day, and it has the function of absorbing ultraviolet rays. When shooting, it is generally necessary to add three levels of exposure, which can be mastered flexibly according to shooting requirements and filter depth. This kind of mirror is generally used for black-and-white photos and can also be used for color photography. The filter functions of other colors are basically similar.

2, UV (ultraviolet) mirror:

The mirror can basically eliminate the influence of ultraviolet light and stray light on film sensitivity and protect the lens at the same time. Photography is more needed in plateau areas.

3. Blue mirror (b):

Used for black and white photography. Mirrors absorb red, orange and yellow through cyan, blue and purple light. When the wavelength is about 400-500nm, it is necessary to increase the exposure by about 2 levels (depending on the depth of the color lens).

4. Mirror of the sky:

Sky mirror is extremely light magenta, which can not only absorb ultraviolet light, but also absorb part of blue light and green light, so it has a certain effect on the color balance of the final picture.

5. Reflector:

The mirror is a rectangular reflector with positive reflection (mirror vacuum silver plating) and a pair of coaxial knobs at both ends (for adjusting the lens angle).

6. Gradient mirror:

Gradient mirror is one of the most important filters in photographic art creation. It can be divided into gradient mirror and gradient diffusion mirror, and can be divided into soft gradient and hard gradient in gradient form. Soft? That is, the transition range is larger, and vice versa, that is, the transition range is smaller, which should be chosen according to the creative characteristics.

7. Atomizing mirror:

This kind of mirror is a common filter in natural scenery photography, and it is also widely used in advertising photography and portrait shooting. It can make the work have a foggy effect and increase the sense of atmospheric perspective.

8. Polarizer (polarizer):

PL mirror for short, this kind of filter can effectively weaken or eliminate the reflection of non-metallic surface. Polarizers can be used for black-and-white and color photography. Adding a polarizer to color photography can darken the sky while still maintaining other original colors of the scene.

The function of various filters in digital camera photography requires not only cameras and lenses, but also many small accessories, among which polarizers are one. For outdoor landscape photographers, the use of polarizers is almost as common as UV mirrors, and it is very simple to use. Can make photos look more transparent and brighter.

However, the role of polarizer is far more than that. It can also darken the sky and eliminate reflections, which is very useful when shooting water and glass. Polarizers can also block light and slow down the shutter speed. To understand the usage of polarizer, you need to master some theoretical knowledge. ? Polarized light? This word comes from physics. The reflection of nonmetallic surfaces such as glass and water is polarized light, while the clear blue sky is 90? The scattered light in the direction is also polarized light. These rays need to be avoided and polarized light can be eliminated, which can darken the sky and effectively reduce the influence of glare on photos. Polarizer can eliminate polarized light at a certain angle by using grating principle. Special attention should be paid to the shooting angle here. When shooting in reverse light or positive light, the role of polarizer is limited, and it must be at a certain angle with the light source and reflection.

Polarizers are very useful when shooting scenery, especially when the sky gets dark, which can make the color of the blue sky more saturated and highlight the clouds in the sky. However, extremes meet, so don't use polarizers too much. For example, the reflection of leaves and grass is polarized light, which is conducive to expressing details and layering. If these lights are eliminated, the picture will be supersaturated and have no sense of hierarchy.

The greater use of polarizers is to eliminate reflections, such as reflections on water and glass windows. In this way, you can shoot more details, such as things in the window, or rocks and weeds in the water. Moreover, the polarizer can reduce the amount of light entering the lens and slow down the shutter speed, similar to the medium gray density mirror.

Polarizers can be divided into linear polarizer (LPL) and circular polarizer (CPL). The former is mainly used for old manual cameras, because it will interfere with automatic exposure and camera metering system. At present, most polarizers on the market are CPL, so you should choose them according to your own lens caliber, and choose ultra-thin polarizers when shooting with wide-angle lenses to avoid dark corners.

Install the filter correctly using the camera filter.

Screw the filter on the lens, keep it clean, wipe off the dust carefully, and avoid touching the lens with your fingers. Then slowly turn the polarizer, and you will find the change of light in the picture. The illumination direction of the light source and the angle of the reflecting surface will affect the final effect.

Set shutter speed

Pay attention to the setting of shutter speed when using polarizer. Polarizers can make colors more saturated, but also reduce the amount of light entering the lens. In order to slow down the shutter speed and affect the image clarity, it is best to ensure a safe shutter speed or use a tripod to shoot.

Rotating polarizer

After adjusting the exposure parameters, you can start shooting. Choose the composition, look at the viewfinder and turn the polarizer. You will find that the color of the sky changes greatly. You can also experience the influence of different light on polarizer from another angle.

Photo analysis

1. The polarizer reduces the reflection on trees and makes the green color more saturated, but it also retains the layers and textures of leaves, adding a touch of new green in spring to the picture.

2. The filter weakens the reflection of the lake, so that the foreground in the picture does not look pale, and more underwater details are presented in the picture.