Zoom lens is a lens in which the image size can be varied continuously while the image remains in focus.
The zoom ratio of 12 (1:!2) is the physical limit of zoom macro lens.
In addition, the lens in which the magnification can be varied continuously while the image does not remains in focus is not a zoom lens but a lens with variable magnification.
In other words, focal distance changes but magnification also changes is cheaper than the zoom lens is the characteristics of the lens with variable magnification.
Our company has various types of lenses. Please see the products here.
You can choose the lens according to the characteristics such as magnification, focal length, price, etc.
Besides, please consult us to select appropriate lenses. Please contact the technical support.