Canon EOD 50D Instruction Manual page 242

6. Using the Image Stabilizer
The image stabilizer can be used in either AF or MF mode.
1. Set the image stabilizer switch to on I.
2. Press the shutter button halfway to activate the image stabilizer.
3. To stop using the image stabilizer function, set the image stabilizer
switch to off
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The normal image shows the
photograph that results when
the camera moves while the
shutter is open (camera shake).
This movement results in the
photographic image recorded
on the film being blurred.
Normal image
(with camera shake)
With image stabilizer activated
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