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 prime for the EF-S system, introduced in 2014. At 22.8mm long it barely protrudes from the camera body, transforming any Canon APS-C DSLR into a genuinely pocketable camera. The 24mm focal length provides a 38mm equivalent perspective on APS-C — close to the classic standard field of view, broadly versatile for street, travel, and everyday use. At f/2.8 it gathers significantly more light than kit zooms at the same focal length, making it useful in lower-light conditions where a zoom would require a meaningfully higher ISO setting.
The optical design uses 6 elements in 5 groups. The 52mm filter thread is shared with the EF-S 18-55mm kit lenses and several other Canon EF and EF-S lenses, making filter carry-over practical. At 125g the lens keeps the camera-and-lens combination close to body-only weight, practical for compact APS-C bodies. Minimum focus distance is 0.16m, enabling close-up work at distances closer than most standard primes. There is no image stabilisation; the 38mm equivalent field of view is manageable handheld for stills but video use benefits from a stabilised body. The STM stepping motor provides quiet, smooth autofocus well suited to video recording. Build is entirely lightweight plastic, consistent with the pancake form factor. The constant f/2.8 aperture covers the APS-C image circle only — mounting on full-frame EOS bodies activates crop mode.
The 38mm equivalent is marginally wider than a standard 50mm equivalent, natural for street photography, travel, and indoor environmental work. The primary practical advantage is physical size: paired with the EOS 200D or 250D, the combined depth is closer to a compact camera than a typical DSLR — genuinely jacket-pocket friendly. The f/2.8 provides useful low-light performance and background separation that kit zooms cannot match at the same focal length. STM autofocus is responsive for video without the focus noise of older Canon DC micromotor designs.
On the used market the EF-S 24mm STM is very affordable and one of the strongest value propositions in Canon's APS-C system. Condition checks cover AF motor function and aperture blade operation — there is little else on such a simple lens. The 52mm filter thread is shared with the EF-S 18-55mm IS STM and several other Canon lenses. On RF mirrorless via the EF-RF adapter the lens functions correctly but the pancake depth advantage is partially negated by the adapter. The natural companion for compact Canon APS-C DSLR bodies.