Panasonic DMW-LND72 72mm .9 (8X) ND Filter

The Panasonic DMW-LND72 Neutral Density Filter for DMC-FZ20, DMC-FZ10 digital cameras lets you use a wider aperture or a slower shutter speed. Assuming the same shutter speed, reduced light means a wider aperture for the same exposure.

The benefit is a shallower depth of field that will isolate your subject from the foreground and the background for a dramatic effect. Assuming the same aperture, less light means a slower shutter speed for a longer exposure. This will allow you to deliberately blur motion in your shot, like water flowing over the falls.