The first part of a Canon lens name refers to the lens mount, a quick indication of what cameras the lens works with. Canon ...

Canon has made lenses in five different lens mounts during the digital era. You'll see either EF, EF-S, EF-M, RF, or RF-S to start the lens name. EF lenses are made for full-frame SLRs ...

The new Canon EF-S 24mm f/2.8 ‘pancake’ lens is the slimmest and lightest EF-S lens to date and features a ‘fast’ maximum aperture and stepping motor for near silent autofocusCanon EF-S 24mm f/2.8 STM ...