Canon EF 40mm f/2.8 STM Lens Bundle with Tiffen 52mm UV Protector and Circular Polarizing Lens + Medium Lens Case + Accessory Kit 40mm focal length Stepper-type AF motor with full-time manual focusing 64mm equivalent focal length on Canon APS-C camera Canon EF mount for full frame, APS-H and APS-C DSLRs F2.8 maximum aperture; F22 minimum