- Optically Identical to EF 400mm f/2.8L IS III USM lens
- Optical Image Stabilization with up to 5.5 Stops
- Three IS Operation Modes
- Super Spectra Coating (SSC) and Air Sphere Coating (ASC) Helps Minimize Ghosting and Flare
- Compatible with Canon RF 1.4x and 2x Extenders
- Customizable Electronic Focus Ring
- 9-blade Circular Aperture for Beautiful Bokeh
- Two Focus Presets Available
- Dust- and Water-resistant Design
- with Fluorine Coating on Front Element for Easy Cleaning