Canon's Handheld Night Scene mode improves noise and blur from hand shake by taking several photos and then combining them into a cleaner photo. In this slide, the photo on the top left was taken in Program Auto at ISO 800 and to its right is a 100 percent crop from it. On the bottom is the same shot taken in HNS mode also at ISO 800. There are fewer artifacts and less noise in the HNS shot, though the camera does crop the photo some when processing the image. View larger.