What does 2 million macro lens mean?

It means that the total pixels for taking macro photos are 2 million pixels.

Macro lens is a special lens used for macro photography, which is mainly used to shoot very fine objects, such as flowers and insects. In order to focus on the subject at a very close distance correctly, the macro lens is usually designed to be longer, so that the optical center is as far away from the photosensitive element as possible. At the same time, in the design of lens group, we must also pay attention to the control of deformation and chromatic aberration at a close distance.

product structure

macro photographic lenses generally have two structures. One macro photography lens adopts the structure of built-in telescopic lens barrel, and the other adopts the structure of exchanging the front and rear positions of optical lens groups in the lens.

In ordinary photography, the photographer can focus normally only by rotating the focusing ring of the lens. If he wants to take a close shot, he can move the whole optical system of the lens forward synchronously with the built-in lens barrel as long as the focusing ring that has been rotated to the closest focus continues to rotate, thus increasing the image distance and achieving the purpose of close shot. The latter obtains higher image magnification by changing the front and rear positions of the optical lens group in the lens, so as to achieve the purpose of close-up.