SLR filter selection

1, UV mirror. The main function of UV mirror is to filter ultraviolet rays, so it is called UV filter to prevent the film from turning blue. This is very useful in plateau areas. Because ultraviolet rays are not obvious in plain areas, it is of little significance to filter ultraviolet rays with a UV mirror. So more functions of UV become lens protection.

2. The principle of anti-ultraviolet lens is to prevent fingers from touching the lens by mistake or the lens is dusty, and the lens is exquisite and can't be wiped casually, while UC lens can be wiped, even if it is worn, just change it;

3. There are many brands of UV mirrors, ranging from several thousand yuan (such as Zeiss UV) to tens of yuan cheaper, and the genuine and false are hard to distinguish (testing UV mirrors requires machinery and equipment). It is recommended to buy it in official website (there are relatively few fakes, the price is relatively reasonable, and the water for buying UV mirrors is relatively deep). If you buy in a physical store, it is recommended to put the UV mirror on a piece of white paper to watch. The inside and outside of the mirror ring should be exactly the same, without color cast, and the light transmittance should be above 98%. 18- 105 lens, 100 just buy Ness or Kengo in the early days. Just buy it according to the aperture size of the lens, such as 62MM and 77MM (the diameter and size of the lens are indicated on the lens, 18- 105 should be 67). Of course, if it is a gold ring lens, you need good UV (such as B+W, etc. ), because a good lens is very sensitive to light, and poor UV is harmful to image quality (affecting resolution and forming distortion, increasing dark angle). For a popular analogy, suppose that the refractive index of ultraviolet light is 50. If the general lens refractive index is also 50, it has little effect on the image quality (it will be wasted if UV is used well). If the refractive index of a good lens is 100, the refractive index of the lens will also become 50 after using 50 light to refract UV, which will turn the bull's head into a dog's head and damage the image quality.

4. The uv mirror can be hung and used at any time;

5. Polarizer and UV are completely different. The purpose of using polarizer is to prevent reflection, compress highlights, increase contrast and increase saturation, which is very useful in landscape photography, especially shooting blue sky and white clouds. However, the method of use is different from UV, just twist it in front of the camera, so don't care. Although the polarizer is screwed in front of the lens, it needs to be rotated to the most appropriate angle when it is used, so as to work. If you don't twist it, you can't hang it. In addition, the use of polarizer will reduce the brightness of light, so the shutter should be lowered appropriately.

6. Polarizers can't be hung up for use, but only screwed on when necessary, such as shooting scenery or reflecting water and glass.

7.Kengo or C& is used for 18- 105 lens with polarizer; C, Lu lai, etc. It's all good. Within 500, cheaper Zhuomei and Phoenix brands are not recommended. Use gold ring lenses well.

I hope it helps you.