Fantastic shutter speed control!
NightCap is the best app Ive found to control shutter speed on the iPhone. The user interface is simple and intuitive, the only thing missing is zoom. With this app I’ve taken pictures of the night sky, able to clearly see Orion, Ursa Major, Leo, Gemini, and even the Pleiades. With other camera apps the night sky is wholly black, but NightCap lets you capture the stars. Outdoors or indoors, pictures taken with NightCap are brighter and less grainy, and you dont need the flash.
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NightCap