People these days have short attention-spans, so although time-lapse videos can be very appealing, most of us would probably prefer to watch one for 30 seconds rather than ten minutes. Thanks to a clever feature which Apple simply refers to as “dynamically selected intervals,” almost any time-lapse video you shoot in the default Camera app in iOS 8 will end up as 20-40 seconds, whether you shoot for 10 minutes or two hours …

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