SUPERIOR IMAGES - Experience exceptional clarity with a 21mm focal length and a wide f/2.8 aperture, perfect for landscapes and astrophotography on your Nikon F full-frame camera. ULTIMATE CONTROL - Achieve precise focus with the manual focus feature, allowing meticulous adjustments for stunning detail in every shot, ideal for discerning photographers. ROBUST DURABILITY - Benefit from the weather-resistant design, ensuring reliable performance in diverse shooting conditions, protecting your lens for years of creative exploration. OPTIMIZED OPTICS - Capture breathtaking images with 16 elements in 13 groups, minimizing distortion and aberrations for unparalleled image quality across the entire frame.