The EF-S 24mm f/2.8 STM from Canon is a 38.4mm-equivalent prime designed for APS-C-format DSLRs. Its optical design features one aspherical element, which helps to reduce distortion and spherical aberrations for high sharpness and clarity. A Super Spectra coating has also been applied, which helps to minimize lens flare and ghosting for improved contrast and color fidelity in bright lighting conditions. Short normal-length prime is designed for use with APS-C-format Canon EF-S-mount DSLRs and provides a 38.4mm equivalent focal length. One aspherical element limits distortion and spherical aberration in order to realize greater sharpness and accurate rendering. An STM stepping AF motor realizes smooth, near-silent autofocus that is complemented by a rear focus system, advanced AF algorithms, and a high-speed CPU for fast AF performance. Additionally, a full-time manual focus override is also available.
Canon EF-S 24mm F/2.8 STM Specs