Ordinary lenses are not designed for photomacrography calling for greater magnifications. When they are used for high-magnification photomacrography, image quality tends to decrease with increased magnification. The Canon macrophoto lens 20mm f/3.5 is specially corrected to give optimum image quality in such high-magnification photography. When used with the Auto Bellows, macrophoto lens 20mm f/3.5 gives 4 to 10x magnifications.