New iPhone camera app has released naming as Magic Shutter.It mimics the effects of shooting at slow shutter speeds, and of using flash to freeze a subject.The app actually does use some programming magic to achieve its effects. For instance, if you choose the “flash” modes, you can choose front and rear curtain-sync effects. Front curtain sync takes a sharp image and then records subsequent frames in a kind of still video, allowing those frames to build into a blur. The original, sharp image is laid over the top. Rear-sync does the same, but snaps the sharp photo at the end, making the light streaks appear behind a moving car, say, and giving a more expected effect.