The 18-55mm lens sold with the Rebel XS/1000D offers a feature called image stabilization. On Canon lenses, this feature is indicated by the initials IS in the lens name.
Image stabilization attempts to compensate for small amounts of camera shake that are common when photographers handhold their cameras and use a slow shutter speed, a lens with a long focal length, or both. That camera movement during the exposure can produce blurry images. Although image stabilization can't work miracles, it does enable most people to capture sharper handheld shots in many situations than they otherwise could.
&\NG/ However, when you use a tripod, image stabilization can have detrimental effects because the system may try to adjust for movement that isn't actually occurring. Although this problem shouldn't be an issue with most Canon IS lenses, if you do see blurry images while using a tripod, try setting the Stabilizer On/Off switch (shown in Figure 1-3) to Off. You also can save battery power by turning off image stabilization when you use a tripod. (Note that blurry images can result from causes other than camera shake; see Chapter 6 for help.)
If you use a non-Canon lens, the image stabilization feature may go by another name: anti-shake, vibration compensation, and so on. In some cases, the manufacturers may recommend that you leave the system turned on or select a special setting when you use a tripod, so be sure to check the lens manual for information.
Chapter 6 offers more tips on achieving blur-free photos, and it also explains focal length and its impact on your pictures. See Chapter 5 for an explanation of shutter speed.
Focal length indicator
Zoom barrel Auto/Manual Focus switch
Image Stabilizer On/Off
Focal length indicator
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