http://www.techwench.com/the-functions-of-asm-on-digital-camera/
A lot of control is provided by ASM functions over your camera.
To help you find quickly the settings needed for taking pictures, a set of easy modes are readily available in most digital cameras. However, because of using some of these settings, such as (“S”) shutter priority, (“A”) aperture priority and (“M”) manual options, which are more advanced, more control are given to photographers over their work.
