Long before the RF mount was even a gleam in Canon's collective eye, they had another mirrorless system: the EF-M mount. Though the mount never really caught on like the RF mount did, it was passionately supported by a group of loyal photographers who loved its small size and surprisingly affordable and capable lenses. Unfortunately, the EF-M mount has now left us, but this great video essay takes a look at the history of the system and why photographers loved it.