The Canon 40mm f/2.8 EF STM is a compact pancake prime lens for the Canon EF autofocus mount, designed for full-frame and APS-C DSLR bodies. Its slim profile and STM stepping motor made it a popular walk-around and video-friendly option, offering a near-normal field of view on full-frame and a short telephoto equivalent on crop sensors.

Sales data for this lens is thin, with the only logged UK auction hammer result reaching £60 in November 2025 — a wholesale-level figure achieved in the saleroom rather than a retail asking price. With just one verified sale, today's market value should be treated as indicative only, and clean copies in original packaging may sell for more privately. Buyers researching what a 40mm f/2.8 EF STM is worth should compare condition carefully, as the small dataset means the price a copy sells for can vary widely.