The iPhone 5's iSight camera on the back features the same eight-megapixel sensor as its predecessor, the iPhone 4S, only thinner and with sapphire lens cover. In addition, the module has been improved for better low-light performance, yielding major quality improvements when snapping up your photos under artificial light or in low-light situations. And now, developer can optionally tap the iPhone 5's low-light camera mode in their own apps, which bodes well for dozens upon dozens of photography apps in the App Store...
Devs can use the iPhone 5’s low-light boost mode in their own apps