The lightest and thinnest lens in the EF-S series for APS-C sensor cameras, the EF-S24mm f/2.8 STM is a pancake lens measuring 22.8mm in thickness (about a third in thickness in comparison to a kit lens) and weighing only 125g (the same weight as a smart phone). k6C3P.

canon ef s 24mm f 2.8 stm pancake lens review