Canon lens EF 400mm f4 DO IS USM User Manual

ENG-10
The dedicated Lens Hood ET-120 helps to
prevent stray light from entering the lens and
protects the front of the lens from rain, snow or
dust.
To  
attach the hood, loosen the hood locking knob
by  turning it counterclockwise. Fit the hood onto
the lens hood mount, and tighten the locking
knob to fix it in place. Use the same procedure,
in reverse, to remove the hood.
8. Hood
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ENG-11
9. Using the Tripod Mount
Adjusting the Revolving Mount
You can loosen the orientation lock-knob on the tripod mount to allow it to rotate as needed to fit a
particular camera model for switching between vertical and horizontal positions.
Detaching
First remove the lens from the camera and then remove the tripod mount from the lens as shown
below. To attach the tripod mount, reverse the procedure.
Loosen the orientation
locking knob.
Rotate the tripod mount and
align the mounting indicator
on the...

ENG-12
10. Drop-In Filters
The lens comes with the drop-in Gelatin Filter
Holder 52 holding a glass filter. The holder
accepts commercially-available gelatin filters.
14mm14mm
47mm
47mm
Removing and Installing
To  remove the drop-in filter, press in the left and
r ight lock buttons and pull the filter holder straight
up out of the slot.
To   install the drop-in filter, push the filter holder
straight down into the slot until it clicks into place.
.• The filter holder can be installed facing either...

ENG-13
11. Extenders (Sold separately)
•First attach the Extender to the lens, then attach the lens to the camera. Detach it from the
camera in the reverse order. If you attach the lens to the camera first, misoperation may
occur.
•
With Extender EF2X II attached to the lens, only manual focus is possible. However, with the EOS-
1Ds Mark III, EOS-1Ds Mark ll, EOS-1Ds, EOS-1D Mark lll, EOS-1D Mark ll N, EOS-1D Mark ll,
EOS-1D, EOS-1V/HS, EOS-3 camera, autofocusing with the center focusing point is...

ENG-14
Camera-to-SubjectMagnification
Distance (mm)
Near Far Near Far
EF12 II 2870 13384 0.16 ×0.03×
EF25 II 2424 6549 0.20 ×0.07×
13. Case
Belt
Ke yhole
LeverLid
Y
ou can attach Extension Tube EF12 II or EF25
II for magnified shots. The shooting distance and
magnification are shown below.
12.Extension Tubes (Sold separately)
Manual focusing is recommended for accurate
f ocusing.
When putting the lens into its case, follow the
procedure below.
Attach the hood in reverse, then attach the
lens cap....

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Specifications
Focal Length & Max. Aperture400mm, f/4
Lens Construction17 elements in 13 groups
Min. Aperturef/32
Angle of ViewDiagonal: 6°10’ Vertical: 3°30’ Horizontal: 5°10’
Min. Focusing Distance3.5 m
Max. Magnification & Field of view0.12×, 197 ×296mm/7.7 ×11.6 inch (at 3.5 m)
Filter Drop-in 52-series
Max. Diameter & Length128 dia.×232.7mm/5 dia. ×9.1 inch
W eight 1940g/67.9oz
Lens Hood ET-120
Lens CapET-145
Case Lens Case 400B
•The lens length is measured from the mount surface to the front...

©CANON INC. 2002
CT1-8509-0040812Ni
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