Canon EF 200-400mm f/4L IS USM Extender 1.4x Lens OverviewA long-reaching zoom characterized by its versatility, the EF 200-400mm f/4L IS USM Extender 1.4x from Canon is a medium to super-telephoto distinguished by its unique optical design and fast performance. Featuring a built-in 1.4x extender, you can quickly and intuitively switch between the native 200-400mm f/4 setting and an effective 280-560mm f/5.6 for greater reach. Benefitting this unique design is a sophisticated optical layout, which includes one fluorite element and four ultra-low dispersion elements to control chromatic aberrations and color fringing for increased clarity. A Super Spectra coating has also been applied to individual elements to reduce lens flare and ghosting for greater color accuracy and contrast when working in bright or backlit conditions.What's In The BoxCanon EF 200-400mm f/4L IS USM Extender 1.4x LensE-145C Lens Cap for EF 300mm f/2.8L IS II USMLens Dust Cap E (Rear)Lens Wide Strap B f/EF 300 / 400 mm f/2.8L IS II USMET-120 Lens HoodLens Case 200-400 for Canon EF 200-400mm f/4L IS USM Lens with Internal 1.4x Extender52mm Drop-in Gelatin Filter Holder (Black)Tripod MountStrap for Hard CaseExtra Bundle Items:Lens Pen Cleaner (Has Felt Tip and Brush Tip - Must Have!)Dust BlowerLens Cleaning SolutionLens Cap Keeper2 Year Extended Warranty Included (Replaces Manufacturer Warranty)