Features:

• Revised Optics for a lighter Super telephoto EF L Lens
• Continues strong tradition of image quality associated with L-Series lenses
• Super spectra coating (ssc) and Air sphere coating (asc) minimizes ghosting and flare
• Increased heat shielding measures for reliable, longer shooting outdoors
• Dust- and water-resistant with fluorine coatings for use even in harsh conditions

Details: The EF 400mm f/2.8L is III USM is a Canon L-series optic well-suited for outdoor, wildlife, and sporting events. This version III features a lighter weight design along with a sophisticated optical layout and updated handling capabilities.