The AE-1 was the first in what became a complete overhaul of Canon's line of SLRs. The 1970s and 1980s were an era of intense competition between the major Japanese SLR brands: Canon, Nikon, Minolta, Pentax and Olympus. Between 1975 and 1985, there was a dramatic departure from heavy all-metal manual mechanical camera bodies to much more compact bodies with integrated circuit (IC) electronic automation. In addition, due to rapid advances in electronics, the brands leap-frogged each other with successively more automated models.