Canon EF-S18 Instruction page 9

Image Stabilizer
The image stabilizer in this lens is effective for hand-held shots under the following
conditions.
@;
In semi-darkened areas such as indoors or
@;
When panning subjects in motion.
outdoors at night.
~
In locations where flash photography is
prohibited, such as art museums and theater
stages.
$I
In situations where your footing is uncertain.
®:
In situations where fast shutter settings cannot
be used.
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ENG-8