NightCap is a photography app that extends the maximum exposure time of the iPhone camera to a full second. “Capturing quality images with NightCap is very straightforward as it features a simple automatic mode,” the developers say. “The camera adjusts exposure and focus automatically, and will use the flash if needed. In low light it automatically uses longer exposures.” The app also offers a manual mode in which you can turn the flash off and set the exposure time anywhere from 1/20th to 1 second. Available on iTunes, NightCap sells for $0.99.