With a moderately fast f/3.5 maximum aperture, this macro lense offers much the same outstanding performance as the f/2.0 introduced at a very late stage, but its strength is in a smaller, highly portable format. Since the front lens element is very inward, the use of lens hood is not entirely necessary unless there is a direct light source. This Zuiko Macro lens is extremely versatile, as used with wide-range of system accessories which greatly extends the magnification range while retaining extremely acceptable standards of resolution and contrast. o Maximum Aperture: 1:3.5 o Angle of view: 47° o Optical construction: 5 elements in 4 groups; Multicoated for later versions,unknown for earlier ones o Diaphragm operation: Automatic o Focusing: Straight Helicoid; provided for aberration correction at close working range (floating elements system) o Minimum photographic range: 48mm x 72mm (1-7/8" x 2-3/4") o Filter attachment size: 49mm screw-in type o Maximum diameter: 60mm (2-3/8") o Reproduction Ratio: 1:2 (1/2 Life Size)* o Length: 40mm (1-1/2") o Weight: 200g (7-1/8 oz)