Description
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
SPECIFICATIONS
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 | ||
Distance Scale | o | ||
Drive System | Ring-type USM | ||
Filter Size (mm) | 52 | ||
Max. Magnification (x) | 0.13 | ||
Min. Aperture | 32 | ||
No. of Diaphragm Blades | 9 | ||
Anti-dust and Moisture | Supported | ||
Weight (g) (Approx.) | 2100 |