- EF Mount Lens/Full-Frame Format
- Gapless Dual-Layer Diffractive Optics
- Large Diameter Aspherical Element
- Ultra Low Dispersion Element
- Protective Fluorine Coatings
- Ultrasonic AF Motor and Internal Focus
- Optical Image Stabilizer with 3 Modes
- Power Focus Mode; Full-Time MF Override
- Dust- and Water-Resistant Construction
- Rounded 9-Blade Diaphragm
- Canon EF 400mm f/4 DO IS II USM Lens
- ET-120W II Lens Hood for EF 300mm f/2.8L IS II
- E-145C Lens Cap for EF 300mm f/2.8L IS II USM
- Lens Dust Cap E (Rear)
- Lens Wide Strap B f/EF 300 / 400 mm f/2.8L IS II USM
- 52mm Drop-in Gelatin Filter Holder (Black)
- Lens Case 400D for EF 400mm f/4 DO IS II USM
- Strap for Hard Case
- Limited 1-Year Warranty