The Canon AE-1 Program followed the original AE-1 model with the addition of Program Auto Exposure, improved durability, interchangeable focusing screens and the ability to accept Canon's Motor Drive MA. Easy to use and reliable as well, the AE-1 Program went on to become one of the most successful camera designs in history.
The AE-1 is compatible with the full line of Canon FD-mount manual focus lenses.