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Table 21 Wide-Angle versus Telephoto Setting WIDE ANGLE Broad view Smaller image Good for close shooting Deep depth of field Increases object speed toward camera Minimizes camera shake TELEPHOTO Narrow view Larger image Good for distant shooting Shallow depth of field Decreases object speed toward camera Maximizes camera shake
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Let s say you need to shoot a group of people, some near the camera and some farther away If you want them all to be in focus, you can increase the depth of field (or the depth of the area in focus) by choosing the wide-angle setting However, if you want only the people close to the camera to be in focus (shallow depth of field), choose the telephoto position The range of a zoom lens is expressed as a ratio between the extreme telephoto and wide-angle settings A 12:1 zoom ratio means that the telephoto image is 12 times larger than the wide-angle image
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Your brain is the best autofocus mechanism ever invented Despite advertising claims, there is no electronic camera system as precise and controllable as your brain Under unusual constraints for example, when precise manual focus is not practical due to lack of space or when
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For example, to make a car look like it is moving faster than it is toward the camera, use the wide-angle setting On the other hand, if you want to slow down the car s apparent speed, use the telephoto setting
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There are two ways to change the length of a camera lens You can use different lenses of varying lengths (wide-angle, normal, telephoto) or one zoom lens, which adjusts from short to long for an infinite range of wide-angle to telephoto views A setting that is longer or shorter than normal affects your image in predictable ways Table 21 shows the results of setting the zoom length at its extreme short or long position
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it would be too time-consuming you can use autofocus to help ensure that your images are crisp You can also use autofocus to create certain visual effects Under normal shooting conditions, however, make sure that autofocus is turned off There are three reasons not to use autofocus:
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The constant focusing adjustment drains the battery Focus can shift unpredictably if elements in your image move You cannot shoot through windows, fences, trees, fabric, or do mirror shots Focus will shift constantly between the foreground image and the background action
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Focus manually for maximum control What you see (in the viewfinder) is what you get (WYSIWYG) If your image is out of focus during shooting, it will not look any better during playback To focus a zoom lens, here are three tips: 1 Adjust the lens to the full telephoto position so the subject looks as big as possible in the viewfinder 2 Turn the lens focus ring until the subject is in focus in the viewfinder 3 Then, (without changing the focus setting you made in Step 2), zoom the lens to compose your shot and create the desired point of view
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NOTE important to remember to prefocus on your subject in the full telephoto It s
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(zoomed-in) position If you focus in the wide-angle setting, you will not be able to zoom in from wide-angle to telephoto without losing focus Although the telephoto setting creates a short depth of field, the wide-angle setting creates a long depth of field (and is therefore always in focus)
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Depth of field (DOF) is the distance in front of and behind your subject that is in sharp focus There is always less DOF in front of your subject than behind it Certain factors (illustrated in Table 22) can increase or decrease DOF to enhance the visual impact of your videography
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