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Overview: The Canon EF400mm f/5.6L USM lens is a
high-performance super-telephoto lens for use with Canon EOS cameras. The lens features
a built-in Ultrasonic Motor (USM) for quick and quiet autofocusing. The lens is constructed of
7 elements in 6 groups, including UD (ultra-low dispersion) and super UD
elements for excellent imaging capability.
Focus Modes: The EF400mm lens is equipped with a two-way
switch for setting the Focus Mode. You can choose from AF (auto focus) or MF
(manual focus). In Manual Focus mode, you can focus on your subject by turning
the focus ring. The focusing ring always works, regardless of the focus mode.
Focus Range Switch: You can switch between two focusing ranges using the two-way switch on the barrel of the lens. You can choose
from a range of 3.5 meters (11.5') to
infinity, or a range of 8.5 meters (27.9') to infinity. Depending on your subject matter, the correct choice of focus range can reduce the
auto focusing time.
Lens Hood: The built-in, non-detachable lens hood cuts out unwanted light
and protects the lens from rain, snow, and dust. Extending the lens hood adds
almost 3 inches to the overall length of the lens.
Tripod Mount: The included tripod mount ring allows you to
mount the camera onto a tripod by the lens instead of the camera body. You can
loosen the orientation lock knob on the tripod mount and rotate it as needed for
switching between vertical and horizontal positions.
Display Window: The EF400mm lens has a display window on the
barrel near the focus range switch that provides the following:
- Infinity Compensation Mark: The lens provides an "L"
infinity mark to compensate for shifting of the infinity focus point that
results from changes in temperature. The infinity position at normal
temperature is the point at which the vertical line of the L mark is aligned
with the distance indicator on the distance scale.
- Infrared Index: The infrared index corrects the focus
setting when using monochrome infrared film.
- Depth-of-Field Scale: The depth of field is the
distance in front of and behind the plane of focus on the subject that
appears sharp. The depth of field is indicated by the area between the
depth-of-field scale lines below the distance scale.
Optional Lens Extenders: The lens is compatible with EF1.4x
II and EF2x II lens extenders (sold separately). The extenders will
increase the focal length to 560mm (EF1.4x) and 800mm (EF2x).
- Focal Length: 400mm
- Minimum Aperture: f/32
- Maximum Aperture: f/5.6
- Minimum Focus Distance: 11.5 feet
- Filter Diameter: 77mm
- Angle of View:
- Diagonal: 6° 10'
- Vertical: 3° 30'
- Horizontal: 5° 10'
- Dimensions: 3.577" Diameter, 10.307" Length,