This app was designed to calculated the maximum reccommended shutter speed to set a camera at when photographing the stars so that the streak effect from the rotation of the earth will not occour. The camera must be on a tripod or another steady surface while shooting.
This app does not take photos of the stars but recommends settings to set a camera at to take the photographs.
Currently the app supports Canon and Nikon cameras, please comment and I will add other camera types.