Because the Auto function adjusts the shutter speed according to the ambient light intensity, you can't control the way that the recorded images will appear.
A fast shutter speed captures each motion clearly. This emphasizes the dynamic nature of the motion or shows motion that the human eye cannot see. When this effect is used to accentuate video productions, it can create some unexpected and interesting visual effects.
Shutter Speed adjustment is also useful for night scenes. When the shutter speed is slow, the camcorder receives a large amount of light even when the ambient light intensity is relatively low, resulting in brighter pictures. The camcorder also receives more light when the aperture is fully opened. This lets you capture night scenes with extreme beauty.
* When the shutter speed is slow, the captured images may blur due to hand-shake. For optimally beautiful images, use a tripod.