The Canon AE-1 is a 35 mm single-lens reflex (SLR) film camera for use with interchangeable lenses. It was manufactured by Canon Camera K. K. (today Canon Incorporated) in Japan from April 1976 to 1984. It uses an electronically controlled, electromagnet horizontal cloth focal plane shutter, with a speed range of 2 to 1/1000 second plus Bulb and flash X-sync of 1/60th second. The AE-1 is a historically significant SLR, both because it was the first microprocessor-equipped SLR and because of its sales. Backed by a major advertising campaign, the AE-1 sold over one million units, which made it an unprecedented success in the SLR market.