ULTRA-WIDE PERSPECTIVE - Capture stunning 210° circular fisheye views with the 4mm focal length, perfect for unique and creative shots, expanding your visual horizons. SUPERIOR IMAGE QUALITY - Experience exceptional sharpness and clarity from f/2.8 to f/16, thanks to the lens's carefully crafted 7 elements in 6 groups optical design. COMPACT AND LIGHTWEIGHT - Weighing only 4.76 oz (135g) and measuring 1.77 x 1.0', this lens is incredibly portable, making it ideal for on-the-go photography and travel. VERSATILE L MOUNT COMPATIBILITY - Seamlessly integrates with Leica SL, Sigma fp, and Panasonic Lumix series cameras, ensuring broad compatibility and ease of use.