About The Lens Image Stabilizer - Canon EOS 50D Instruction Manual

About the Lens Image Stabilizer

The procedure explained here is based on the EF-S17-85mm f/4-5.6 IS
USM lens as an example.
* IS stands for 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 EF-S17-85mm f/4-5.6 IS USM or 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 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-S18-200mm f/3.5-5.6 IS and EF-
S18-55mm f/3.5-5.6 IS lenses switch the IS mode automatically.
Set the IS switch to <1>.
1
Set the camera's power switch to
<1>.
Press the shutter button halfway.
2
The Image Stabilizer will operate.
Take the picture.
3
When the picture looks steady in the
viewfinder, press the shutter button
completely to take the picture.
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