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The EF 400mm f/4.0 DO IS MKII USM Lens 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. Features: 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.
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35mm film equivalent focal length (mm)
Angle of view (horzntl, vertl, diagnl)
5°10′, 3°30′, 6°10′
Lens construction (elements/groups)
No. of diaphragm blades
Closest focussing distance (m)
Maximum magnification (x)
Filter diameter (mm)
52 Drop in
Max. diameter x length (mm)
128 x 232.7
Lens Case 400D
Lens Dust Cap E
Magnification w/ Extension Tube EF12 II
Magnification w/ Extension Tube EF25 II
Canon drop-in 52mm filters
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