If so, you'll be interested in Noctacam, an app I built that does exactly this: https://itunes.apple.com/us/app/noctacam/id1240793690?mt=8
You can also see how the photo will look before you take it, rather than regretting after the fact that you missed a shot.
Try it, and let me know what you think. Is it useful? In what situations do you use it? Any other thoughts?