Its collapsible brass-aluminum barrel retracts to 2.7cm for travel, while the 50mm f/2 optics and 12-blade diaphragm deliver smooth, rounded bokeh. The manual-focus-only design and classic optical formula yield gentle flaring and a rendering reminiscent of vintage lenses, all within a durable aluminum shell. This lens suits street and portrait photographers seeking a compact, tactile manual-focus experience and characterful bokeh over modern autofocus convenience.