Canon EOS 7D - Manual (Page 33)

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When you use the IS lens’ built-in Image Stabilizer, camera shake is
corrected to obtain a less blurred shot. The procedure explained here is
based on the EF-S15-85mm f/3.5-5.6 IS USM lens as an example.
* IS stands for Image Stabilizer.
1
Set the IS switch to <1>.
Set the camera’s power switch to
<1>.
2
Press the shutter button halfway.
X The Image Stabilizer will operate.
3
Take the picture.
When the picture looks steady in the
viewfinder, press the shutter button
completely to take the picture.
About the Lens Image Stabilizer
The Image Stabilizer is not effective for moving subjects.
The Image Stabilizer may not be effective for excessive shaking such as
on a rocking boat.
With the EF28-135mm f/3.5-5.6 IS USM lens, the Image Stabilizer will
not be very effective while you move the camera to take panned shots.
The Image Stabilizer can operate with the lens focus mode switch set to
either <AF> or <MF>.
If the camera is mounted on a tripod, you can save battery power by
switching the IS switch to <2>.
The Image Stabilizer can operate even when the camera is mounted on
a monopod.
Some IS lenses enable you to switch the IS mode manually to suit the
shooting conditions. However, the EF-S15-85mm f/3.5-5.6 IS USM, EF-
S18-135mm f/3.5-5.6 IS, and EF-S18-200mm f/3.5-5.6 IS lenses switch
the IS mode automatically.