Tiffen - Screw-On ND

ND .3 reduces incoming light by 1 stop.
ND .6 reduces incoming light by 2 stops.
ND .9 reduces incoming light by 3 stops.

The Variable/Fader ND Filter offers a unique way of maintaining total control over your exposure and depth of field, as well as presenting an easy way to create some special effects. The filter is designed with a built-in rotating ring that controls neutral density.