Canon's tiny APS-C pancake prime, providing a 38mm equivalent in a near-flat profile.
The Canon EF-S 24mm f/2.8 STM is Canon's only pancake lens for the EF-S mount, introduced in 2014. At just 22.8mm long it barely protrudes from the camera body, making any Canon APS-C DSLR dramatically more pocketable. It provides a 38mm equivalent perspective, close to the classic standard focal length.
Optical quality is good for a lens this thin with sharp centre performance from wide open and acceptable corners. Distortion is well controlled. The STM motor provides quiet autofocus suitable for video. At f/2.8 it gathers significantly more light than kit zooms at the same focal length. Build is all-plastic but the lens is so small there is little to break.
Canon EF-S mount only, 52mm filter thread. There is no EF full-frame pancake equivalent at this price point. The lens works on all Canon APS-C DSLRs. On RF mirrorless bodies via adapter it functions but adds significant depth, negating the pancake advantage.
Good value used. There is very little to go wrong with such a simple lens. Check AF motor and aperture blades. The lens transforms the handling of a Canon DSLR, making bodies like the 200D or 250D genuinely pocketable. An underrated gem in Canon's EF-S lineup.