What is the function of the 55-250mm lens, what are its characteristics, and is it practical for travel? What is the definition of macro focal length?

The 55-250 has a variety of functions and can be used for anything. But it is mainly used for street sweeping and traveling.

The price is cheap, but the image quality is really poor. The telephoto is long enough, but the aperture is small, not constant, and there is no anti-shake. It is very practical for traveling. Especially when the distance is far or cannot be reached, you can use the telephoto end to shoot. Save yourself the trouble of adjusting the shooting distance back and forth. This head does not have the macro function. You can use the telephoto range to shoot at close range to achieve the macro function as much as possible. Macro is not the focal length. There are macro lenses for many focal lengths. Macro refers to whether the photos taken can achieve a 1:1 magnification ratio.