This will tell you how many stops lower you can shoot
than indicated by the reciprocal of the focal length, as discussed in the last
paragraph.
Choose the ISO Setting
With a traditional film camera, you choose the film speed to match the
conditions under which you??™ll be shooting: you use low-speed film in bright
light or high-speed film in dim light. Most digital cameras and all digital SLR
cameras enable you to choose the ISO setting to suit the scene you are recording,
which is like changing film speed on-the-fly. For example, if you??™re inside a
museum that prohibits flash photography, you can choose a higher ISO setting
that enables you to shoot at a higher shutter speed to avoid camera blur.
Figure 2-10: Shoot at a high shutter speed to freeze action.
CAUTION
Some cameras have an auto-ISO setting, which means
that the camera chooses the ISO. Using this setting can
cause unpredictable results. Your best bet is to choose
the lowest ISO setting that enables you to create the
desired rendition of the scene. In some instances, such
as when photographing a landscape in cloudy conditions,
you may have to use a tripod to shoot with a high f-stop to
achieve the desired depth of field at a lower ISO setting.
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