The Canon EF 50mm f/1.4 USM is a fast standard prime for Canon's EF autofocus mount, designed for full-frame and APS-C SLR bodies. Introduced in 1993, it sits between the budget EF 50mm f/1.8 and the L-series f/1.2, offering a bright maximum aperture for low light, portraits and general use. It uses a ring-type USM motor with full-time manual focus override.

At recent UK auction, hammer prices for the EF 50mm f/1.4 USM have clustered around £70 to £106, with a median near £103 based on 2024 and 2025 saleroom results. A 2022 result of £212 stands out as an outlier, likely reflecting a kit or better condition; today in 2026 the typical saleroom worth of a clean standalone copy sells for roughly £100. These are wholesale hammer levels — dealer retail asking prices for tested examples normally sit higher.