Neutral Density filters evenly reduce the amount of light passing thru the lens without effecting color.
Ideal for reducing bright light in large aperature situations when a narrow depth is field is needed.
Allows for slower shutter speeds when blurring or showing of movement is desired.
Allows balancing of exposure to highlight a key subject.
Lets you use higher speed films in bright light.
.9 (8X) Reduces the light three f-stops.