What types of SLR lenses are there? What is the function of each lens? What are the specifications of each lens?

Camera filter 1 introduction. UV (ultraviolet) mirror: This kind of mirror can basically eliminate the influence of ultraviolet and stray light on film sensitivity, while protecting the lens. Photography is more needed in plateau areas. Second, the sky mirror: absorbs ultraviolet rays and is suitable for all weather. Outdoor photography can reduce the blue shadow caused by scattered light in the sun and keep the natural color. At the same time, it protects the lens. Third, the red mirror (R): absorbs blue light, which can produce romantic sky effect or moonlit effect during the day, and 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. Fourth, orange mirror: absorbs blue-green light and transmits yellow, orange and red, that is, the wavelength is about 560-700nm. It can deepen the blue tone and enhance the contrast effect of the scene. V. Yellow mirror (Y): used for all black and white films. It can accurately correct the tone of full-color film in outdoor photography, so that there is a greater contrast between blue sky or trees and white clouds. It can be used as a special effect filter in color photography. 6. Green mirror (G): transmits yellow light and green light, absorbs red light and blue-violet light, and can pass in the wavelength range of about 500-600nm. Often used to darken the sky and show skin color. Need to increase the exposure by about 3 levels. Generally only full-color film is used. Seven, 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). Grey mirror (ND): It has consistent absorption characteristics in the visible range. It blocks light without changing color. It is a common filter to adjust brightness. 9. Leiden 80: This mirror is a color temperature conversion filter, which is divided into three types: A, B and C. Leiden 80A can increase the color temperature from 3,200 K to 5,500 K. With this mirror, the solar film can be applied to artificial light sources. 10. Leiden 8 1: Leiden 8 1 is a warm light balance filter, which is divided into three types: A, B and C. Its color is light amber, which can slightly correct the blue tendency in the shot picture, so as to achieve true color reproduction. In practical use, Leiden 8 1C is the most. 1 1 .leyden 82: This mirror is a color balance filter. Light blue, divided into three types: A, B and C. This filter is characterized by small color temperature change and fine adjustment on the premise that the color temperature of the light source is basically the same as the balanced color temperature of the film. 12. Leiden 85: 85 series is divided into three types: A, B and C, which belong to color temperature conversion filters. 85B can reduce the color temperature from 5500K to 3200K. The mirror is amber, which is suitable for using light film in the sun. Fluorescent mirror: Fluorescent mirror is a special color compensation filter. When daylight color film is used to shoot under fluorescent lighting, the shot picture will produce blue and green tones. If you shoot with a fluorescent lens, you can correct the above color deviation and make the color of the picture return to reality. 14. Gray mirror. Be strongly blocked by light. Under the premise of proper exposure, you can shoot excellent night scenes in the sun. 15. Red intensifying mirror: This mirror is an advanced filter made of imported optical materials made of expensive rare earth elements. It can completely absorb the turbid yellow light and orange light between 570 and 600 nm in the spectrum, and at the same time make the red light pass smoothly. Therefore, the color saturation of red, light red and brownish red objects in the scene can be significantly improved, making them more vivid, gorgeous and intense. For example, maple leaves are redder in autumn, strawberries and tomatoes are more attractive, and the atmosphere of sunset is more intense; Weddings or Christmas are more festive. When mirrors are used with polarizers, the blue sky can be more colorful and beautiful. The exposure of 1/2- 1 should be increased when using this mirror. 16. Gradient mirror: Gradient mirror is one of the most important filters in photographic art creation. It can be divided into gradient mirror and gradient diffuser. In terms of gradient form, it can also be divided into soft gradient and hard gradient. "Soft" means that the transition range is larger, and conversely, the transition range is smaller, which should be chosen according to the creative characteristics.