Thu Feb 22, 2018 2:13 am
I don’t come here much anymore, but I would have answered just like this:
EF, EF-S, and EF-M are each different mount types for different types of lenses intended for different cameras. EF is the standard Canon electronic mount intended for all their current EOS line of cameras and lenses based on SLR-style bodies, particularly the 135 format ones, but will work for APS-C and APS-H types. EF-S is also intended for EOS bodies, however these lenses will only work for APS-C type bodies. EF-M is for the new mirrorless range of cameras whose mounts have a shorter flange distance than the older EF standard. EF lenses will work on EF-S bodies. EF-S lenses will not work on EF mount bodies. EF-M lenses and bodies will not work with EF or EF-S lenses or bodies. However, EF and EF-S lenses may work on an EF-M body with an adapter.
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