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Turn the camera s mode dial to the shutter priority icon Many cameras use the abbreviation Tv or S for shutter priority mode Choose the desired shutter speed Refer to your camera manual for the control that sets the shutter speed If you select a shutter speed that will result in an underexposed or overexposed picture, your camera will display a warning Refer to your camera manual for further details Compose and shoot the picture
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Understand Shutter Speeds
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The shutter speed determines how long the shutter remains open to record the scene Shutter speeds are measured in fractions of a second or, when shooting a long exposure, in seconds If you re shooting in dim conditions without a flash, you ll need a slow shutter speed, such as 1/15 of a second The rule of thumb for the slowest shutter speed at which you can handhold a camera is the reciprocal of the lens focal length (this refers to the 35-mm equivalent) In other words, if you re shooting an image with a digital SLR using a 20-mm lens with a focal length multiplier of 15, you ll need a tripod with any shutter speed slower than 1/30 of a second You can, however, use a slow shutter speed to create artistic blurs, such as the headlight patterns shown in Figure 2-9 Slow shutter speeds are also useful
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Figure 2-9: When you shoot at a slow shutter speed, you can create artistic blurs, such as headlight patterns
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when photographing a stationary subject in dim lighting conditions If you re photographing a subject with a slow shutter speed, your subject must remain perfectly still; otherwise, the image will be blurred When you shoot at a high shutter speed, such as 1/2000 of a second, you freeze action, as shown in Figure 2-10 To avoid blurry images when you re using a high-end digital camera with a zoom lens, you ll need to shoot with a faster shutter speed when you zoom in tightly on a subject When in doubt, a tripod will always ensure that the camera remains steady while you re taking the picture If your camera features image stabilization, be sure to enable the feature when taking photos that must be sharp With image stabilization, you can shoot a couple of f-stops lower than you normally would Remember, the general rule of thumb is that the slowest shutter speed you can use for the 35-mm equivalent of the focal length with which you re shooting is to use the reciprocal of the focal length To find out how many stops lower you can shoot, enable image stabilization, and take several photographs of the same subject using slower shutter speeds than normal Download the images to your computer, and compare them at 100 percent magnification Examine the edges of objects in the scene for sharpness 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
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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
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
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