LEICA DG QUALITY - LEICA DG Mirrorless Micro Four Thirds lenses provide the ultimate in optical quality and performance. LEICA DG Lenses meet the strict quality standards set by Leica Camera AG. F1.4 APERTURE - High-speed F1.4 LEICA DG SUMMILUX lens with outstanding image rendering and exquisite soft-focusing effect. RUGGED DESIGN - Dust and splash -resistant design withstands heavy field use under harsh conditions for high mobility COATED OPTICS - Nano Surface Coating by Panasonic ends unwanted ghosting and flaring FILTER THREAD - For greater creative control this lens offers a 46mm thread mount for polarizer and other options lens filters.