New de-clicked aperture option allows infinitely fine adjustment between F-stops, perfect for video use Weather-sealing around the lens mount area prevents infiltration of moisture and/or rain drops 9 aperture blades create excellent bokeh or a stunning 18-ray starlight effect in wide angle images Constructed with 3 High Refractive, 1 Hybrid Aspherical, 1 Aspherical, and 2 Extra-low Distortion lens elements for outstanding, sharply defined images Features the latest generation multi-layer anti-reflection ultra multi-coating (UMC) to minimise flare and ghosting