L-series lenses Canon EF lens mount

top range canon ef lenses designated l-series , or luxury lenses. l series lenses compatible full range of ef or ef-s mounts , aimed @ high-end user, include environmental or weather sealing , constant maximum aperture. l lenses supplied complete hood , pouch, not included non-l lenses. distinctive visual cues include red ring around lens , off-white colour on longer-focal-length models. latter helps reflect light , reduce heat absorption.

all l lenses include @ least 1 fluorite or ultra-low-dispersion glass element, and/or types of aspherical elements. other mechanical characteristics of l lenses (but not exclusive them or present in l lenses) use of ultrasonic motor (usm) focusing (particularly in recent years) , image stabilization (is).