Canon EF 400mm f/5.6L USM Telephoto — 10x High-Definition 2 Element Close-Up (Macro) Lens (77mm)

High Definition (Beveled Design) +10 Close-Up Lens engineered to mount on a 77mm front thread. Optical construction: High-Index / Low-Dispersion 2 Element Optical Glass for improved close-up clarity. Surface treatments: Fully Multi-Coated optics with Anti-Reflection Coating. Mechanical: threaded design for simple attachment—easily attaches to the lens listed in the title.