Like the EF-M 22mm lens for EOS M bodies, this Canon lens for APS-C format DSLRs has a pancake design that enables a super-slim profile. In fact, it’s a millimetre shorter than the EF-M lens but 7mm wider, measuring 68x23mm.And despite featuring one less element in its optical path, it’s 20g heavier, but is still a lightweight at 125g.
Further similarities in design between the EF-M and EF-S lenses include the use of one aspherical optical element, Super Spectra coatings and a well-rounded seven-blade diaphragm. Again, AF is courtesy of a quick and quiet stepping motor, with an electronically coupled manual focus ring. This time, however, the focus ring is rather small and fiddly.