Abstract: A camera filter is an additional lens installed in front of the camera lens to filter natural light. The biggest advantage of the filter effect is that it is convenient for users who do not know PS. Choose a good composition, add your own little ideas, and easily click

You can take creative photos with just one click of the shutter.

Here is an introduction to camera filter knowledge.

Camera Filters Functions of Color Filters Types and Uses of Color Filters Use of Color Filters 1. Red Mirror (R): Absorbs blue light, can produce a romantic sky effect or a moonlit night-like effect when shooting during the day, and has the function of absorbing ultraviolet rays.

When shooting, it is generally necessary to increase the exposure by three levels. The specific requirements need to be flexibly controlled according to the shooting requirements and the depth of the filter.

This mirror is generally used for black and white photos, but can also be used for color photography.

The functions of other color filters are basically similar.

2. UV (ultraviolet) mirror: This mirror can basically eliminate the impact of ultraviolet rays and stray light on film sensitivity, and at the same time protect the lens.

Photography is even more necessary in plateau areas.

3. Blue mirror (B): Used for black and white photography.

The mirror passes cyan, blue, and violet light and absorbs red, orange, yellow and other colors.

The wavelength passes in the range of about 400-500nm, and the exposure needs to be increased by about 2 levels (flexibly controlled according to the depth of the color mirror).

4. Sky light mirror: The sky light mirror presents a very light magenta color. In addition to absorbing ultraviolet light, it can also absorb part of the blue light and green light, so it plays a certain balancing role in the color of the final picture.

5. Reflection mirror: This mirror is a rectangular reflector with regular reflection (mirror surface vacuum silver-plated), with a pair of coaxial knobs at both ends (used to adjust the lens angle).

6. Gradient filter: Gradient filter is one of the most important filters for photographic art creation. It can be divided into gradient color filter and gradient diffuser lens. In terms of gradient form, it can be divided into soft gradient and hard gradient. Soft? That is

The transition range is larger, and vice versa, that is, the transition range is smaller, both of which need to be selected based on the creative characteristics.

7. Fog mirror: This mirror is a commonly used filter for natural scenery photography. It is also widely used in advertising photography and portrait photography. It can produce a foggy effect in the work and increase the sense of atmospheric perspective.

8. Polarizer (Polarizer): Referred to as PL filter, this filter can effectively weaken or eliminate the reflection of non-metallic surfaces.

Polarizers can be used in both black and white and color photography.

Adding a polarizer when taking color photography can darken the color of the sky while still maintaining the other original colors of the scene.

The role of various filters in digital cameras. Photography requires not only a camera and a lens, but also many small accessories. Polarizer is one of them.

For outdoor landscape photographers, the use of polarizing filters is almost as common as UV filters, and it is very simple to use. It can make photos look more transparent and colors more vivid.

However, the role of a polarizer goes far beyond that. It can also darken the sky and eliminate reflections, which is very useful when photographing water and glass.

Polarizers can also block light and slow down the shutter speed.

To understand how to use polarizers, you need to master certain theoretical knowledge.

The word "polarized light" comes from physics. The reflected light from non-metallic surfaces such as glass and water is polarized light, and the scattered light from a clear blue sky at 90° to the sun is also polarized light.

These lights need to be avoided. Eliminating polarized light can make the sky darker and effectively reduce the impact of glare on photos.

The polarizer uses the grating principle to eliminate polarized light at a certain angle.

Special attention needs to be paid to the shooting angle here. When shooting with backlight or along the light, the role of the polarizer is limited, and it must be at a certain angle with the light source and reflection.

When shooting landscapes, polarizers are very useful, especially when darkening the sky. They can make the colors of the blue sky more saturated and highlight the clouds in the sky.

However, the extremes of things must be reflected, so do not use polarizers excessively. For example, the reflections of leaves and grass are also polarized light. These reflections are helpful for expressing details and layers. If these lights are eliminated, the picture will be over-saturated and without layers.

The greater use of polarizers is to eliminate reflections, such as reflections from water surfaces and glass showcases.

This allows you to capture more details, such as things in the window, or rocks and plants in the water.

Moreover, a polarizer can reduce the amount of light entering the lens and slow down the shutter speed, achieving a similar effect to a neutral density filter.

Polarizers are divided into linear polarizers (LPL) and circular polarizers (CPL). The former is mainly used in old manual cameras because it interferes with automatic exposure and the camera's metering system.

Most of the polarizers on the market today are CPL. When purchasing, you should choose according to the caliber of your lens. When shooting with a wide-angle lens, choose an ultra-thin polarizer to avoid vignetting.

When shooting landscapes, learning to use a circular polarizer will have an immediate effect and give your photos a completely new look.

Install the filter correctly. Screw the filter onto the lens, keep it clean, wipe off dust carefully, and avoid touching the lens with your fingers.