The Vivitar Automatic Tele Converter MC 2X-1 Lens is a high-quality teleconverter lens designed for photographers looking to magnify their images by a factor of 2.0x. Made in Japan, this unit is compatible with Vivitar cameras and features a 42mm case for easy storage and protection. The lens fitting is M42/Universal, making it versatile for use with various camera models. This lens is a valuable addition to any photography equipment, offering precision and convenience for capturing stunning images.