1987 The EF revolution
The EF mount introduced electronics into the lens – that and a focus motor.
2003 EF-S for smaller cheaper lenses
ef_s18-55_35-56 versionsThe EF-S mount is a minor mechanical variation on the EF mount, meaning that you can use EF lenses on an EF-S camera, but not vice versa. It still has the same 44mm flange distance.
2012 The smaller EF-M mount
The EF-M mount was introduced in 2012 for the small EOS-M range of mirrorless cameras.
2018 The Canon RF mount
Considering that I’m writing this before any public displays of the RF mount or EOS-R I should note that this is a preliminary discussion ;-)
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