EF400mm f/4 DO IS II USM
The EF400mm f/4 DO IS II USM is a professional lens that is particularly suited for wildlife and sports photographers. This lens allows photographers to achieve the reach of a super-telephoto lens, while maintaining superior standards of mobility in the lens through a portable and lightweight form factor. While traditional telephoto lenses are designed with gaps between the optical elements to reduce chromatic aberration, the EF400mm f/4 DO IS II USM uses a gapless dual-layered diffractive optical element, which greatly reduces the ring-shaped diffractive flaring caused by high-intensity light sources. This reduction is taken further with the incorporation of a large diameter ground aspherical lens and a UD lens.
It also contains an improved IS unit that significantly enhances image stabilization when the appropriate IS mode is selected and features a shorter minimum focal distance, down to 3.3m from 3.5m in its predecessor. Maximum magnification has also improved from 0.12x to 0.13x as a result of the superior lens characteristics. The EF400mm f/4 DO IS II USM is highly resistant to harsh environments. This is achieved through a fluorine coating on both the front and rear lens elements, which makes the lens dirt and oil-resistant while easier to clean. All rings and buttons are constructed with a dust and drip-proof structure, preventing dust and liquid from entering the sensitive interior of the lens.
- Focal length and maximum aperture : 400 mm 1:4
- Lens construction : 18 elements in 12 groups
- Diagonal angle of view : 6°10’
- Focus adjustment : Ring-type USM, Inner focusing system, full-time manual focus
- Closest focusing distance : 3.3 m/ 10.83 ft., 0.13 x magnification
- Filter size : 52 mm rear drop-in type
- Max. diameter x length, weight : ø128 x 232.7 mm, 2100 g/ 5.04” x 9.16”, 4.63 lbs.
- Equipped with IS
|Angle of View (Diagonal)||6°10’|
|Angle of View (Horizontal)||5°10’|
|Angle of View (Vertical)||3°30’|
|Closest Focusing Distance (m, ft)||3.3/10.83|
|Construction (groups elements)||12-18|
|Diameter x Length (mm) (Max.)||128 x 232.7|
|Drive System||Ring-type USM|
|Filter Size (mm)||52|
|Max. Magnification (x)||0.13|
|No. of Diaphragm Blades||9|
|Anti-dust and Moisture||Supported|
|Weight (g) (Approx.)||2100|