The world's first 600mm lens with an Image Stabilizer for added steadiness and sharpness when working at slower shutter speeds. It shares the same lightweight, weather-resistant construction as the 300, 400 and 500mm IS Super Telephoto lenses, as well as their improved control layout, improved weight distribution, and mechanical manual focus.

Key Features:

• Flourite & UD elements eliminate secondary spectrum chromatic aberration.
• AF speed is the fastest in the world.
• Full-time manual focus override.
• AF Stop function shuts off autofocus when an obstruction appears
• Dust & moisture resistance made exceptional by magnesium alloy lens barrel and new rear gasket at lens mount.
• Two-stage image stabilization; dual-axis camera shake correction or vertical axis only(for panning).
• 3-stage focus limiter.
• Focus preset function allows for returning to a specifically set focus by turning a ring in front of the focus ring.

More information about Canon Products and Lenses: (Link to Canon Website)