The Canon AE-1 and Canon AE-1 Program are both 35mm film SLR cameras, but there are some differences between them. The AE-1 Program, introduced after the original AE-1, offers an added program mode in which the camera automatically sets both the aperture and shutter speed. In contrast, the original AE-1 requires manual setting of both aperture and shutter speed. The AE-1 Program also has a different exposure compensation system and a redesigned film advance lever.