50mm wide-aperture standard lens (35mm equivalent: 75mm when used with a Nikon DX-format SLR).
Large maximum aperture of f/1.4.
Advanced optical design minimizes flare and chromatic aberration.
SWM (Silent Wave Motor) for fast, quiet autofocus.
Two focus modes: M/A (manual-priority autofocus) and M (manual focus).
IF (Internal Focusing) design for fixed lens length.
Non-rotating front element allows use of circular polarizing filters and lens-mounted flash accessories.
Focus ring does not rotate during AF operation.