Carl Zeiss Mutar I 2x Teleconverter Yashica Contax mount. This is a 2x teleconverter that fits all Yashica Contax lenses. It works well with the Planar series, and I used it with the Planar 50mm and Sonnar 135mm. The brightness decreases by one stop, but there is almost no degradation in image quality. The optics have some minor dust particles, but there is no mold or fogging, and they are in a clean condition. There are scratches on the exterior, and the leatherette has been re-wrapped. Stored in a dehumidified storage. Body only. No caps etc.