Canon EOS

Canon EOS (Electro-Optical System) is a series of cameras with autofocus capabilities produced by Canon Inc. The brand was introduced in 1987 with the Canon EOS 650, a single-lens reflex camera. Since then, EOS has become Canon's flagship series of interchangeable-lens cameras, with one or more new cameras released each year. All EOS cameras used 35 mm or APS-format film until Canon introduced the EOS D30, the company's first in-house digital single-lens reflex camera, in 2000. Since 2005, all newly announced EOS cameras have used digital image sensors rather than film, with EOS mirrorless cameras introduced in 2012. Since 2020, all newly announced EOS cameras have been mirrorless systems.

EOS cameras are primarily characterized by boxy black camera bodies with curved horizontal grips; the design language has remained largely unchanged since the brand's inception. The EOS series previously competed primarily with Nikon SLR cameras and, as of September 2025, competes primarily with Sony mirrorless cameras. The series was conceived as a camera system built around autofocus as a core feature. To that end, the EOS series was introduced alongside the electrically-driven and autofocus-centered EF lens mount, which replaced the previous mechanically-driven and primarily manual-focus FD lens mount. The EF mount and its variants were the primary lens mounts for EOS cameras for decades, eventually being replaced by the RF lens mount in 2018, which was designed for mirrorless cameras and has now become the standard lens mount for the series.

As the EOS series has evolved, the products have undergone frequent naming changes and component updates, including autofocus, exposure metering, and flash metering. The system has contributed to the popularity of autofocus cameras and the prevalence of video-recording features in consumer cameras, and has been used by numerous professional photographers and cinematographers.