A close-up is basically just taking a photograph when your lens is very near your subject. There are four key points to this.
1. Depth of field is small when doing close-ups because your camera is so near your subject, there's not a lot of room for background. Your subject is sharp and fills up the majority of the space, so you need to choose carefully what you want to focus on.
2. Movement in subject, camera, or both, is magnified with close-ups, so you ought to keep both steady and still.
3. The working distance is the space between the lens and the subject, and should be different based on different subjects.
4. Automatic flash exposure could be inaccurate when working close-ups. At close distances, response time is difficult because of trying to prevent overexposure, so you need to work carefully and try different settings.
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