Canon's 1989 professional film EOS — the body that launched the EOS-1 line.
The Canon EOS 1 arrived in 1989 as the first professional body in the EOS system, built to move Canon's press and sports users from the manual-focus F-1 onto the electronic EF mount. It headed the EOS range until the EOS 1N replaced it in 1994.
The EOS 1 is a 35mm film SLR with the Canon EF mount, a vertical-travel shutter from 30 seconds to 1/8000 with 1/250 flash sync, and a single central cross-type autofocus point driven by Canon's BASIS sensor. Metering covers evaluative, partial and spot patterns. It runs at 2.5 frames per second on its 2CR5 cell, rising to 5.5 with the Power Drive Booster E1, and the body weighs about 845g with a 100 percent viewfinder.
Against the later EOS 1N and 1V it offers a single AF point and slower burst, but it shares their weather-resistant build and full compatibility with every EF lens, which keeps it a workable film body for anyone already holding Canon glass. Many examples surface with the E1 booster attached.
Check the shutter for the sticky-damper residue common to this era, confirm the LCD panels have no bleed and that the command dial clicks positively. Bodies with the Power Drive Booster E1 fitted trade slightly higher; heavy press use shows as worn grips and brassed plates, so favour clean examples.