What does EF / EF-S / EF-M mean?
These acronyms tell you which lens mount it’s designed to fit. EF lenses can be fitted on every EOS DSLR (EOS M mirrorless cameras require the EF-EOS M mount adaptor), EF-S lenses only fit APS-C crop cameras.
These acronyms tell you which lens mount it’s designed to fit. EF lenses can be fitted on every EOS DSLR (EOS M mirrorless cameras require the EF-EOS M mount adaptor), EF-S lenses only fit APS-C crop cameras.