old school professional camera's uses a thing called a "Shutter" for capturing the images. That's what makes the "snapping" sound. You can adjust the speed of said shutter, an example of shutter speeds found on the left hand side of that "handy" guide. Megapixels are easier huh? It's even more grunge ye dinna know what yer band name means!!!! I wonder what Kurt thought "Nirvana" meant...