It came into existence in 1987.
Ef m lenses on full frame.
The effective zoom range in full frame terms is 88 320mm which is very useful even if it doesn t give as much telephoto reach as say canon s ef s 55 250mm lens for aps c format slrs.
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The ef m 55 200mm f 4 5 6 3 is stm offers an extended zoom range that makes faraway subjects fill the camera s frame meaning it s just right for portraiture sports and wildlife photography.
While it would be nice to be able to just use all canon lenses interchangeably it s not that easy.
Similar to ef s lenses not being used on full frame canon dslrs you are unable to use ef m lenses on canon rf mount cameras.
These lenses often are cheaper than their canon counterparts which is one of their big selling points.
Ef stands for electro focus which indicates that there is electronics inside the lens which is used for focusing the lens.
Ultimately the ef m lens is an ideal compromise between compact build and telephoto power.
Ef lenses are canon lenses for dslr cameras which are compatible for both full frame and aps c canon camera bodies.
It is the successor of canon s older fd lenses.