This extension tube can be used to obtain the desired magnification.
An actual magnification effect changes with each specific lens.
It is designed to enable a lens to focus closer than its normal set minimum focusing distance.
Getting closer has the effect of magnifying your subject (making it appear larger in the viewfinder and in your pictures).
It is useful for macro photography, enabling you to convert almost any lens into a macro lens at a fraction of the cost while maintaining its original optical quality.
The extension tube has no optics.
It needs to be mounted between the camera body and lens to create more distance between the lens and the focus plane.