If you’ve looked at arty pictures of waterfalls or rivers then you’ll no doubt have seen those creative long-exposure shots where the water is intentionally blurred but the surroundings — the rocks, trees etc — remain pin-sharp. It’s a great technique to give the impression of motion in a still image and it used to be something you’d need a DSLR with filters and tripods to take. But a neat feature built right into the iPhone’s camera lets you take shots that look just as good.
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