Canon EF 70-300mm f4-5.6 IS USM - Manual (Page 9)

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7. Tips on Using the 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
outdoors at night.
¡ In locations where flash photography is
prohibited, such as art museums and theater
stages.
¡ In situations where your footing is uncertain.
¡ In situations where fast shutter settings cannot
be used.
¡ When panning subjects in motion.
● MODE 1 ● MODE 2