Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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Apple's Oscar Ad Shot Entirely on an iPad
Mashable reports that the ad itself was filmed entirely on an iPad Air 2. Apple created a special section in the App Store highlighting the various apps used by the students for their filmmaking.