One advantage of photographing people involved in an activity is that you don't have to worry about your subjects standing around looking self-conscious.
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Use a normal lens to isolate your subject and the work, or if an interesting or exotic background warrants, use a wide-angle lens. A telephoto will let you zoom in on vivid details.
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An intriguing background can lend authenticity (and sometimes humor) to your images of people at work.
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