The current Canon EF lens mounting system for EOS cameras was first introduced in 1987. It incorporates electronic contacts to operate the autofocus and control the aperture in the lens. This type lens is usable on all EOS cameras, including film and all formats of digital sensors.

Is Canon EF the same as EOS?

In short, EF refers to the mount type for Canon lenses, while EOS is a name given by Canon to the series of bodies that used the Electro-Optical System.

Can I use my EF lenses on EOS R?

The standard Mount Adapter EF-EOS R allows EF-S and EF lenses to be used on EOS R cameras seamlessly. Photographers who already have a collection of EF-S or EF optics can invest in the EOS R System confidently, knowing their existing lenses will work as expected.