The Sigma USB Dock UD-01 NA is a lens adapter designed for Nikon mount cameras, allowing Sigma lenses to be used on Nikon cameras. This unit is manufactured in Japan and is compatible with Nikon cameras, providing a seamless integration of Sigma lenses with Nikon mount cameras. The USB Dock UD-01 NA is a reliable and quality product from Sigma, ensuring precise and optimal performance when using Sigma lenses with Nikon cameras.