EF Lenses


EF400mm f/4 DO IS II USM

  • Specifications
  • Block diagram
  • Sample Image
Marketed November 2014
Original Price 899,000 yen
Lens Construction (group) 12
Lens Construction (element) 18
No. of Diaphragm Blades 9 (circular aperture)
Minimum Aperture 32
Closest Focusing Distance (m) 3.3
Maximum Magnification (x) 0.13
Filter Diameter (mm) 52
Maximum Diameter x Length (mm) 128 x 232.7
Weight (g) 2,100

Combining chromatic aberration-correction capabilities surpassing those of fluorite lenses with aspherical-optical characteristics, Canon’s DO lens effectively suppresses the chromatic and other optical aberrations that frequently occur in telephoto lenses while contributing to the realization of a lens that is compact and light in weight.
The new EF400mm f/4 DO IS II USM incorporates ground aspherical and UD (Ultra-low Dispersion) lens elements that enable it to achieve a level of imaging performance that exceeds Canon’s previous-generation EF400mm f/4 DO IS USM, which was released in December 2001. The new model’s dual-layer DO lens reduces the occurrence of ring-shaped flaring* caused by bright light sources to approximately one-fourth the level of the earlier model. Furthermore, because the DO lens’s placement is in a position where it is not subject to exposure from light sources located outside of the image frame, the new super-telephoto lens also reduces the occurrence of backlight flaring.

* Flaring, which can result in visible artifacts or a haze across the image, is caused by the reflective scattering of light inside of the camera or its lens.

Block diagram

Aspherical lens UD lens DO lenses IS unit

Sample Images