●Lens Not Attached:MANUAL LENS need you to enable"M mode" or "Release without lens" in the setting of camera. ●Lens construction:9 groups 12 elements Including 2 aspherical lenses, aperture range of F2.0-F16 ●It is a Wide Angle Lens, suitable for landscape ,Astrophotography Architectural photography. ●Great build quality with all metallic construction,making the lens solid, ●Minimum focusing distance: 0.2m