Canon EF 200-400mm f/4L IS USM Extender 1.4x

Last Updated (19 July'13): - Review & Sample Photos @ Whatdigitalcamera Canon EF 200-400mm f/4L IS USM Extender 1.4x is a High-Performance Telephoto Zoom Lens with a Built-in 1.4x Extender. It features Aperture Range f/4-32, Three-Mode Optical Image Stabilization, Ring USM Autofocus & Internal Focusing System, Power Focus Mode for Smooth Focus Shift, One Fluorite