What are the advantages of fixed focus lenses? By the way, can you explain the relationship between focal length and the distance of the photographed object? Is there any detailed conversion method?

It is much more difficult to manufacture a large aperture for a zoom lens than for a fixed-focus lens.

Therefore, among the lenses on the market, only fixed-focus lenses can achieve ultra-large apertures.

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A lens with a large aperture can allow you to obtain a better background blur effect and highlight the subject being photographed. At the same time, it can allow you to obtain suitable light and a higher shutter speed in darker environments, thus adapting to Worse shooting environment and improved shooting success rate.

About focal length:

The smaller the focal length, it means that the distance from the focus to the lens is smaller, which also means that the captured picture can contain More content (which can exceed the visual distance range of the naked eye), also means that the objects captured are smaller, and the photos taken are visually further away than the actual distance, such as shooting large objects or vast landscape scenes.< /p>

The larger the focal length, it means that the distance from the focus to the lens is larger, and it also means that the captured picture content is smaller. Similarly, it means that the captured objects are larger, and the captured photos are visually closer than the actual distance. Further (the principle is the same as that of a telescope, which can bring distant objects closer for shooting), such as shooting animals or shooting from a long distance.

The specific conversion depends on the size of the camera and components.