Backlighting a subject to create a halo-like outline of their hair and body is an excellent way to make the subject stand out from the background. Although this form of lighting is often achieved in the studio using a flash head positioned behind the subject, it is also possible to do it with natural sunlight. The principle is very simple: the subject is placed so that the sun is directly behind them. As the subject has their back to the sun, their face will be in shade. To get around this, use a white reflector (a white diffuser can also work on bright days) placed on the ground and angled to reflect light back up to the subject. By moving the reflector towards and away from the subject, you can vary the amount of reflected light. Because you are facing the subject with the sun behind them, lens flare (caused by sunlight directly entering the lens) is highly likely. The problem can be avoided by positioning your camera so that the sun cannot directly reach it, either by shooting from a shaded area or by having the subject themselves obscure the sun from view.
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