The A-1 is the high technology standard bearer of the landmark Canon amateur level A-series SLRs. The other members of the A-series are the Canon AE-1 (released 1976), AT-1 (1977), AV-1 (1979), AE-1 Program (1981) and AL-1 (1982). They all use the same compact aluminum alloy chassis, but with differing feature levels and outer cosmetic acrylonitrile-butadiene-styrene (ABS) plastic panels. By sharing most major components, and an inexpensive horizontal cloth-curtain shutter, costs could be spread out over a larger production volumes. The A-1 represented Canon's bid to defeat Nikon through more features and the cheapest price.