The Star-D MC Auto Tele Converter 3X is a lens adapter specifically designed for Pentax-K mount cameras. Made by the brand Star D in Japan, this converter allows for a 3X magnification of the lens, providing versatility in capturing distant subjects with precision and clarity. The converter comes with a case for easy storage and protection when not in use, making it a convenient accessory for photographers looking to expand their lens capabilities. Now tested so does this please ask any questions?