Optically, it is necessary to modify and increase the structure of the lens group, but it is too difficult. So, here are two feasible methods, light and cheap.

Select the macro adapter ring. Very cheap ones will do.

Select a close-up magnifying glass.

Both of them change the imaging magnification of the lens through different optical principles. Compared with the real macro lens, the imaging quality of the two lenses will be degraded.

Macro ring is very strong, and at the same time, different combinations of several rings can be adjusted to change the macro magnification, but it will lead to the failure of aperture linkage, so it is necessary to manually control the aperture and try manual exposure. This tool increases the image distance through the optical principle to achieve close-up.

Close-up magnifying glass is thin, but it is easy to be damaged. After all, it is an independent additional lens. The effect is the same as that of macro ring, but the magnification cannot be adjusted in combination. A lens has a magnification, which is fixed. Generally speaking, his principle is similar to a magnifying glass, which magnifies an object for the first time and then transfers it to the lens, and the lens photographs the magnified effect. This will also lose some image quality to varying degrees.

The above two methods can be selected according to your own needs. You can change the 18-55 lens into a macro lens. Convenient and quick.