The Yashica Auto Yashinon 50mm f1.7 DS-M lens is a vintage standard lens manufactured in the 1970s in Japan. It features a maximum aperture of f/1.7 and is designed for Yashica brand cameras. The lens is made of aluminum and has a focal length of 50mm, making it ideal for capturing clear and sharp images. The lens also includes auto focus capabilities and a 52mm filter size, making it a versatile and high-quality option for photography enthusiasts.