As already mentioned, the Canon EF 40mm f/2.8 STM uses a stepping motor for AF. AF operations are fairly fast in phase detection AF mode but, frankly, not quite as speedy as a ring-type USM AF - at least based on the EOS 5D II. In a silent environment there's also a noticeable amount of AF noise although it remains unobtrusive.
Get as near as 0.16 m to subjects for a close-up view of the world as you explore with stepping motor (STM) focusing technology delivering smooth, quiet focusing when capturing movies and live-action stills. The large f/2.8 maximum aperture allows hand-held low-light shooting and control of depth of field letting you isolate your subject
Slimmest and lightest lens of the EF-S series. Circular aperture (7 blades) delivers beautiful, soft backgrounds. Full-time manual focus allows manual focus adjustment while in One Shot AF mode. Minimum focusing distance of 0.5 ft./0.16 m; maximum magnification of x0.27. Canon EF-S 24mm f/2.8 STM Lens. The Canon EF-S 24mm f/2.8 STM Lens is your passport to low-light photography brilliance. Its wide aperture allows for outstanding performance in challenging lighting conditions, ensuring your images remain sharp and vibrant, even in dim environments. Compact, lightweight, and easy to carry, this lens is the ultimate travel companion.

EF40mm F2.8 STM. 1. EFレンズシリーズ最薄・最軽量を実現した「パンケーキレンズ」. ・ステッピングモーター（STM）の採用などにより、100円硬貨の直径22.6mmとほぼ同じ、全長わずか22.8mmの薄型で、質量約130gの軽量設計。. 2. 優れた描写性能. ・特殊光学素子の

wrote: Will do and thank you. I do have a wide angle lens that's compatible and works well for photography.wanting to use it to create video content now on a tripod. Travel anywhere with this lightweight and compact pancake design. Shoot in low light even hand-held, creating beautiful bokeh with the large f/2.8 maximum aperture. Suited to shooting both stills and movies with STM focusing technology. Combat ghosting and flare with Super Spectra lens coatings. SdzSnWo.
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    • canon ef 24mm f 2.8 stm