Lens construction (group) 9 Lens construction (elements) 10 Number of aperture blades 7 Minimum aperture 22 Minimum focus distance (m) 0.25 Maximum magnification (×) 0.18 Filter diameter (mm) 58 Maximum diameter x length (mm) x (mm) 73.6 x 55.6 Mass (g) 310 Large aperture, 28mm wide angle lens with natural rendering and beautiful bokeh effect.The optical system uses a replica aspherical lens to accommodate the large aperture.In addition to further compactness, spherical aberration is minimized to enable sharp images.Rear focus mechanism and ring USM in the drive system realize quiet and high-speed AF.Full-time manual focus with excellent operability and non-rotating filter frame.