Canon RF 400mm f/2.8 L IS USM Instructions Manual page 19

Image Stabilizer
The Image Stabilizer cannot compensate for a
O O
blurred shot caused by a subject that moved.
The Image Stabilizer might not be fully effective
O O
in the following conditions:
• Large shake or fast vibration
• Panning in MODE 1
Setting the STABILIZER switch to ON consumes
O O
more power than when OFF.
Vibration such as during transport may unlock
O O
the Image Stabilizer and cause rattling, but this
is not breakage and will have no effect on usage.
This will be rectified once the lens has been
mounted on the camera.
When using a tripod, the Image Stabilizer might
O O
not be fully effective or it might be better to set
the STABILIZER switch to OFF, depending on
the type of tripod and where the tripod is located,
as well as on the camera's settings such as
shutter speed.
Although image stabilization will operate when
O O
using a monopod, depending on the shooting
conditions, sometimes the Image Stabilizer might
not be fully effective.
Setting the STABILIZER switch to OFF is
O O
recommended when you are taking pictures
using the Bulb setting (long exposures). If the
STABILIZER switch is set to ON, the Image
Stabilizer may introduce errors.
Depending on the camera there may be image
O O
shake, such as after releasing the shutter.
However, this does not affect shooting.
If you set the camera's Custom Function to
O O
change the AF button assignment, the Image
Stabilizer will operate when you press the newly
assigned AF button.
ENG-18