The makers of Halide, a popular third-party iOS camera app that offers advanced RAW shooting and other powerful tools, are today releasing another photography app: Spectre. Spectre costs $1.99 and comes with one big specialty: long exposures. Long exposures are very common in the DSLR world: they can make an ordinary nighttime city shot feel much more artistic by creating streaks of light from passing cars. Or you can take a long exposure to bring a real sense of moving water to waterfalls or other nature scenes. But on phones, long exposures have often gone ignored: there’s no way of capturing one with the built-in camera on the iPhone or Google Pixel, for example. On devices from Samsung, LG, and others with manual photo modes, it can…

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