SPECIFICATIONS:

The world's first multi-layer DO element for telephoto lens Small and light High image quality Image Stabilization for equivalent effect of a shutter speed of two stops faster Highly resistant against dust and moisture

• Built to our professional standards with fast AF, full-time mechanical focus and dust and water-resistant construction
  The EF 400mm f/4 DO IS USM is the worlds first super telephoto lens incorporating "Multi-Layer Diffractive Optical (DO) Element", for camera lenses, and is considered a major breakthrough. The outstanding feature, being its superb ability to correct chromatic aberrations. By incorporating this optical element in the optical design the EF 400mm f/4 IS USM is much smaller and lighter than a comparable lens having conventional optical elements. The Multi-Layer Diffractive Optical Element developed by Canon is a milestone optical element possessing the characteristics of both fluorite and aspherical elements, which has led to the production of high-performance camera lenses.
  
  
  
• Angle of view (horzntl, vertl, diagnl) 5°10', 3°30, 6°10'
  
• Lens construction (elements/groups) 17/13
  
• No. of diaphragm blades 8
  
• Minimum aperture 32
  
• Closest focusing distance (m) 3.5
  
• Maximum magnification (x) 0.12
  
• AF actuator USM
  
• Filter diameter (mm) 52 Drop-in
  
• Max. diameter x length (mm) 128 x 232.7
  
• Weight (g) 1,940
  
• Magnification with Extension Tube EF12 0.16 - 0.03
  
• Magnification with Extension Tube EF25 0.20 -0.07
  
• Lens hood ET-120
  
• Hard case Lens Case 400
  

 

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