The Canon EOS ( Electro-Optical System ) is an autofocus 35 mm film and digital SLR camera system that was introduced in 1987 with the Canon EOS 650 and is still in production as Canon 's current dSLR system . The Canon EOS ( Electro-Optical System ) autofocus 35 mm film and digital SLR camera system was introduced in 1987 with the Canon EOS 650 and is still in production as Canon 's current DSLR system .