Having pioneered other innovations for amateur photographers such as the Instamatic and the 110 cartridge film camera, Kodak launched its disc camera and film in 1982. It was designed to capitalize on the popularity of the simplicity and easy film loading ability of Instamatics, combined with advances in film technology. The Disc 4000 was introduced in 1982 and stopped in 1984. In practice, the very small (8 mm x 10 mm) size of the negatives produced with disc film was unpopular, and Kodak stopped producing cameras for this format in 1990. Production of disc films ended in 1998. The 4000 disc camera had an aspheric lens patented by Kodak, and featured a low-light sensor to automatically activate the flash. This camera also had a power source located somewhere in the camera that you could not replace. Many of the cameras still work today.