SPECIFICATIONS:

• Ultra-High performance super-telephoto lens
  With a large aperture of f/2.8, the EF 400mm f/2.8L IS II USM is an ultra-high-performance super-telephoto lens delivering exceptional image quality in a durable design using magnesium alloy and titanium to reduce weight.
• L-series quality
  The L-series is Canon's flagship professional lens range, representing the best in precision-designed EF optics. L-series lenses combine superior performance with superlative handling, and are highly resistant to dust and moisture.
• 4-stop Image Stabilizer
  A 4-stop optical Image Stabilizer – specially designed for the lens’ specific focal length range – works to counteract image blur, which can occur during handheld shooting, or at slow shutter speeds. Automatic panning detection ensures effective performance when tracking moving subjects and, as the IS system is based in the lens, results are visible through the viewfinder during framing.
• 3 IS Modes
  Ideally suited for all types of action photography especially those disciplines that require the utilization of panning, the new IS mode 3 only activates the image stabilizer element during exposure.
• Enhanced image quality with SWC coating
  Designed for use in digital photography, Canon’s patented Subwavelength structure coating helps minimise the ghosting and flare caused by internal reflections. By eliminating the cause, the coating reduces reflections and helps to deliver crisp, clear images.
• Fast, quiet auto focus
  A ring USM (Ultrasonic motor) uses ultrasonic frequency vibrations to drive extremely rapid auto focus with near-silent operation. A high-speed CPU and optimised AF algorithms contribute further to AF speed. Full time electronic manual focus override is available without having to switch out of AF.

• Angle of view (horzntl, vertl, diagnl) 5°10', 3°30', 6°10'
  
• Lens construction (elements/groups) 16/12
  
• No. of diaphragm blades 9
  
• Minimum aperture 32
  
• Closest focusing distance (m) 2.7
  
• Maximum magnification (x) 0.17
  
• Distance information Provided
  
• Image stabilizer 4-stops
  
• AF actuator Ring USM
  
• Dust/moisture resistance Yes
  
• Filter diameter (mm) 52 Drop in
  
• Max. diameter x length (mm) 163 x 343
  
• Weight (g) 3850
  
• Magnification - Extension Tube EF12 II 0.21-0.03
  
• Magnification - Extension Tube EF25 II 0.26-0.07
  
• Lens hood ET-155(WII)
  
• Hard case Lens Case 400C
  

Click Here For Full Specification