The NIKKOR-O 1:4 f/2.1cm lens by Nippon Kogaku is a high-quality wide-angle lens designed specifically for Nikon cameras. With a maximum aperture of f/2.1, manual focus, and a focal length of 1:4, this lens is ideal for capturing stunning images with a unique perspective. Made in Japan, this lens showcases the renowned craftsmanship and precision that Nippon Kogaku is known for, making it a valuable addition to any photographer's gear collection.