This lens belongs to Samyang's XEEN series professional video-cinema lenses. XEEN aims to deliver superior optics, for maximum user satisfaction. With bright T1.5 aperture and outstanding optical performance for 4K+, focus are free to concentrate on the only thing that matters- realizing their creative power. A masterpiece of both form and function, made to meet the needs of professional video-cinema producers and creators, XEEN blazes a new trail in the professional lens market.