How to match Leica M fixed focus lens?

According to rough statistics, Leica has more than 30 M lenses. Among all these lenses, many Leica camera enthusiasts don't know how to choose the right lens. Even if they all buy Leica M lenses, they can only choose the right lens when they go out to use it, otherwise it will bring trouble to their work. What applies? I think we should focus on the theme. If it is only used for travel shooting, we can choose a triple lens or a 35mm lens to take commemorative photos, which is enough to increase the environment. If we are engaged in landscape photography, 28mm lens should be the first choice, and its lens angle is 76, which is what we call a standard wide-angle lens.

How to choose lenses and how to match lenses with different focal lengths is also a science. First of all, the focal length and viewing angle of the lens should be considered when matching the lens. If you choose 2 1mm lens, you can choose more than 35mm and more than 90mm. Because the viewing angle of 2 1mm lens is 92 and that of 35mm lens is 64, the difference between them is about 30. This configuration is scientific in theory and practice.

If you choose a 28mm lens, you can choose a 50mm lens upward, a 90mm lens upward or a 135mm lens upward. The viewing angle of 28mm lens is 76, and that of 50mm lens is 45. The difference between them is 3 1, the difference between 135mm lens is 18, and the difference between the three lenses is almost 30, which is also reasonable.

If the simplest configuration is selected, it is reasonable to use 35mm and 75mm focal length lenses. Because the 35mm lens has a wide range of applications, people often regard it as a "one-step standard lens and one-step wide-angle lens", which is especially suitable for taking documentary photos. 75mm lens is between 50mm standard lens and 90mm telephoto lens, which can be used as both standard lens and telephoto lens, but it is different from the concepts of standard lens and telephoto lens, so it should be selected in use.

As a standard lens, the 50mm lens has a viewing angle of 45, which is close to the human eye, so many people use this lens alone. For example, Cartier Bresson, a famous photographer, loves only 50mm lenses all his life and has produced countless excellent works. When choosing a lens, many cinematographers suggest that 90mm and 135mm lenses can shoot a long distance. Actually, this is a wrong concept. The lens is calculated from the angle of view and magnification. For example, a 50-mm lens is a standard lens, that is, the image formed by the 50-mm lens is 1: 1, and the 100 mm lens is twice as large as the 50-mm lens, that is, the image taken by the 100mm lens is twice as large as that of the 50-mm lens. By analogy, through calculation, we can know that the lens you use is several times larger or smaller than the standard lens at the same distance.