When shooting the sky, you will use an orange filter to increase the contrast between the blue sky and white clouds. Why?

The function of color filter The color filter is designed with the color filter coefficient, and the exposure must be multiplied by this coefficient. If the color filter is marked with "2.x", the exposure time when using the color filter must be "2.x" times that when not in use. Note: On the light meter that measures light through the lens, the color filter coefficient will be automatically added to the exposure reading. 1 Introduction of UV and color filter for color film. UV 0 10 ultraviolet rays will cause fog, thus reducing the clarity of photos and making images look blurred; This situation can be eliminated by UV0 10 color filter. Although ultraviolet rays are invisible to the naked eye, they generally exist in the clear sky in mountainous areas and seaside, so UV0 10 filter is transparent and colorless, without any exposure compensation, so it is often hung on the lens as a protective lens. The color filter index is 1.0. 2. The faint pink color filter-1ASL-1a1a in the sky can offset the blue color cast that is easy to appear when taking pictures in bright sunlight, so that the scenery in the photo presents a pleasant warm tone. At the same time, ultraviolet rays are filtered to remove the fog phenomenon. Many people call it a sunshine mirror; Like UV mirror, it is often chosen as a protective mirror and attached to the lens for a long time. The color filter index is about 1. 1. 3.8 1C when taking photos in the sun; Especially in the clear sky of Wan Li in spring and summer, when there are no clouds, it is highly recommended that you use the 8 1C color filter, which can remove the serious blue tone and fuzzy distortion. It can even reduce the blues caused by too much sunlight in the shadow. The color filter index is about 1.2. 4. When the proportion of blue in 8 1ef sunlight is too large (such as noon in summer in mountainous areas), it will cause extremely serious blue color cast. 8 1EF filter can eliminate this phenomenon. It can not only filter out ultraviolet rays, but also eliminate fog. The color filter index is 1.4. 5. If the 85-color filter is matched with the 85-color light film, it can be used in the sun or shot with a flash without blue light. In addition, there are many colorful films with this color temperature film, and the color tone will appear brighter. The color filter index is 1.4. 6.85B dark brown 85B color filter, similar to the 85 in use; However, 85B is a better choice for occasions with abundant sunshine or high color temperature (bright sunshine at noon in summer). 7.8 1A8 1Afilter can reduce the color temperature of artificial lighting source to the standard of 3200-degree color temperature of lighting film. Its adjustment ability can reach the color temperature of about 3400 degrees. Because it has the function of reducing the color temperature, it can give a warmer effect to the photo. This kind of color filter is extremely important for artistic creators who are eager for real colors. The color filter index is about 1.2. 8.8 1B8 1B color filter has greater adjustment ability, and its adjustment range can be extended to handle the color temperature of 3500 degrees, creating warmer works. Especially when you shoot portraits under artificial lighting and want to have extremely pleasing tones, we strongly recommend you to use this color filter. The color filter index is about 1.2. 82A This light blue filter can filter out excessive yellow-red light in the morning and evening light. Make the picture look cooler to blend some warm colors. It can also be used for color balance. The color filter index is about 1. 1. 10.82C This film can eliminate the reddish tone caused by moderate color temperature. When a 500-watt solar lamp is used as a light source and a photo is taken with a light curtain, a red color shift will occur, which can be eliminated with 82C. In addition, when taking pictures with old sodium nitrate lamp as light source, 82C color filter must be used. The filtration index is about 1.2. 1 1.80D, a filter with moderate blue can filter out strong red light in the morning and evening. From an optical point of view, this color filter is usually used to reduce excessive yellow, orange and red tones in the scene. The color filter index is about 1.5. 12.80B, dark blue color filter, can adjust the artificial light source of 3400 K, which is more suitable for the environment of sunlight film. Otherwise, the picture will show a strong yellow-orange tone. The color filter index is about 2. 13.80A Using this color filter, you can also take photos at 3000 K without color cast. The color filter index is about 2.2. *. When photos are used for indoor photography and traditional household light bulbs are used as light sources, the color temperature needs to be greatly adjusted. The color filter index is about 2.7. Brief introduction of polarizer 1. Linear polarizer Linear polarizer is usually used in reflective manual adjustment camera or automatic ranging camera to improve color saturation and eliminate reflection. This light gray plane parallel polarization material provides you with the best imaging effect. The color filter index varies with the relative position of the sun, ranging from 2.3 to 2.8. 2. Ring polarizer This color filter is a reflective camera and video recorder, designed for automatic exposure and autofocus. It will not interfere with the metering system of these cameras. The color filter index is between 2.3 and 2.8. 3. Kjeldahl polarizer, an advanced polarizer, is made of specially selected polarizing foil and optical glass. Its edge is sealed by combustion, so it is still quite durable in some special climatic conditions. This kind of lens is also suitable for those occasions that require strict image quality; Especially when matched with various fast focusing long lenses and achromatic lenses. This kind of polarizer has two choices: linear and circular. The color filter index is between 2.3 and 2.8. 4. Temperature-adjustable polarizer This polarizer has the characteristics of both polarizer and color temperature plate. The photographed works not only have the conditions of color saturation, but also have warm colors, which is particularly pleasant. This kind of lens has two choices: linear and circular. The color filter index is between 2.3 and 2.8. 5. The double polarizer consists of a double-layer linear polarizer, which can completely block the light. Its effect can be as high as 3-4 times that of ordinary polarizer. The absorption rate of light is continuous, which changes with the relative angle of two polarizing lenses. It is particularly interesting to use in the fade-out effect of movies or videos. Brief introduction of black and white film 1 color filter. Light yellow (2E) color filter makes the work warmer, softer and more elegant by emphasizing the treatment of yellow, orange and red. It is especially suitable for portrait photography of women and children, improvement of skin color and tone under natural light, landscape photography in spring and natural photography. The color filter index is 1.5. 2. Medium Yellow (8) With this color filter, the green landscape can create a more subtle level and also depict the sky more delicately. We especially recommend it for landscape photography and flower photography. When shooting portraits in the sun, with this color filter, you can dilute the flaws and flushing on the skin, make the skin softer, and at the same time make the light color worse and more pleasing to the eye. The color filter index is 3. 3. When dark yellow remakes works such as beaches and snow scenes, the use of this color filter can be significantly improved. It can also strengthen the contrast between flowers and crops and make the scenery look clearer. This color filter can reduce the defects and freckles on the skin when shooting portraits under artificial light. It can also deepen the color of the eyeball; Fade lip color. The color filter index is 3. 4. Yellow Orange (16) This bright orange filter can deepen the shades of blue, purple, green and yellow-green. This kind of filter is absolutely indispensable for landscape photography and architectural photography. They prefer bright scenery and clear outline. The blue sky stands out against the white clouds and Gao Fancha. This color filter is also widely used in human photography under sunlight. The color filter index is 4. 5. Red Orange (22) This filter can darken the sky, create a dramatic cloud effect of the storm, and use Gao Fancha to enhance the dark part of the shadow. In industrial and commercial photography, it is also often used to enhance the brightness of yellow, orange and red, so that the colors are distinct. The color filter index is 4. 6. Yellow-green (1 1) This color filter can distinguish various green scenes with different color differences and is most suitable for taking landscape photos. Especially when shooting the scenery in spring, it depicts the scenery of young leaves by highlighting the light green tone. In addition, it is often used for portrait photography or group photography under natural light because of its processing effect on red tone. The color filter index is 2. 7. Green (13) This dark green color filter has excellent ability to distinguish the green tones in late spring and summer. It is often strongly recommended for the following occasions: (1) flower photography for painting; Used to distinguish color difference in still photography; And use high-speed film to adjust the red tone when shooting portraits. The color filter index is 3. 8. Light blue This filter is often used to adjust the yellow-red deviation when shooting with artificial lighting such as old lights or household light bulbs. In addition, it is often used to deepen skin color when taking portraits or nude photos. The color filter index is 1.5. 9. The blue filter highlights the sky level by emphasizing the Shan Lan in the valley and the light penetrating the water surface and smoke. In addition, it is often used to improve the level of still photography or adjust the spectral difference of artificial lighting. The color filter index is about 2.0. 10. Light red (25) This color filter is the best tool to increase contrast. When taking landscape photos or buildings, we can use it to highlight white blocks. For example, white clouds appear in front of the dark blue sky, and at the same time, the fog in the distance must be completely dispersed. It can also be used for layered processing in still photography. The color filter index is 5. 1 1. Red (29) When this color filter is used in landscape photography or architectural photography, it can produce "stormy" clouds, moonlight and trees, creating surreal special effects. This kind of filter is absolutely necessary when dealing with the hierarchy of still photography and reproducing blurred and faded old documents. The color filter index is about 8. Soft focus lens 1 introduction. Ring soft-focus lens (1 and 2 degrees) This filter can reduce the contrast of the scene and form a halo around the bright parts. It can also be used to create soft images and blurred outlines. Its function mainly comes from the annular carving on the lens, and its effect can be adjusted by increasing or decreasing the aperture. 2. When using this soft-focus lens, the intensity of the softened contour is only slightly stronger than that of the No.2 ring soft-focus lens. Often used to deal with backlit scenes, the bright halo is obvious, and the dark lines can still be kept clear. Its soft focus effect will not change with the size of the aperture. 3. Zeiss soft focus lens (1 degree and 2 degrees) Although this color filter has been soft focused on the bright part, the theme is still clear until the edge of the outline. So you can still focus easily when shooting. The intensity of its soft focus effect does not change with the aperture size. This pleasant effect is attributed to the tiny lenticular structure design on the glass slide. Different models of soft focus have different strength. 4. Atomizing lens (1 degree, 2 degrees, 3 degrees) The photos taken with this atomizing lens present a detailed and beautiful fog scene. Create a romantic atmosphere through whitening colors and soft light, and bring the image into a different artistic conception. The effect is strong when backlit. Three different concentrations provide you with richer changes. 5. When using this kind of lens, only the central area of the picture is clear, and the surrounding images are blurred, thus drawing the viewer's attention to the main part of the center. This is a very creative tool. When in use, the degree of surrounding haze will change with the aperture size. 6. Local soft-focus lens This kind of lens can also make the central area of the picture present a clear image, but the images in the surrounding area are not indistinguishable, but the outline is soft and the color is slightly albino.