Features: Camera lens mount adapter replacement for EF lens to M4/3 mount camera. Can increase one gear of aperture and the light through the lens. Widens angle of view by 0.71X; 4 elements in 4 groups, one extra-low dispersion element. Aluminum alloy material, precision-machining to ensure perfect mounting tightness and durability. Easy to install and flexible to use, the lens adapter is quite economical and practical.