The LEICA DG VARIO-SUMMILUX 10-25mm/ F1.7 ASPH. (H-X1025E) boasts a large F1.7 aperture throughout the entire 20-50mm (35mm camera equivalent) zoom range with exceptionally high optical performance clearing the stringent LEICA standards. The LEICA DG VARIO-SUMMILUX 10-25mm/ F1.7 ASPH. is suitable not only for photo shooting but also for video recording designed for professional photographers and videographers. It has focus Clutch Mechanism and clickless aperture ring.