The Rebel XS/1000D offers two noise-removal filters, one designed to help eradicate ISO-related noise and another to dampen the type of noise that occurs during long exposures. Noise, the digital defect that gives your pictures a speckled look (refer to Figure 5-7), can occur for two reasons: a high ISO speed and a long exposure time. (See the section "Monitoring Exposure Settings," earlier in this chapter, for details.) Dampening noise In the other advanced exposure modes - Tv, Av, P, and A-DEP - the camera indicates an exposure problem not with the meter, but by flashing either the shutter speed or f-stop value. ✓ In manual exposure mode, the exposure meter also lets you know whether the current settings will expose the image properly. In Live View mode, the settings appear under the image preview on the monitor. ✓ The current aperture and shutter speed appear in the viewfinder and Shooting Settings display. If autofocus is enabled, focus is also set at this point. The following activities then take place: To see the current exposure settings, start by pressing the shutter button halfway. (You can, however, tweak the exposure by using the exposure-compensation feature discussed in the next section.) In A- DEP mode, the camera forces you to use its selected exposure settings. ![]() HBEff You can adjust aperture and shutter speed only in P, Tv, Av, and M exposure modes.
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