Neutral Density filters evenly reduce the amount of light passing thru the lens without effecting color. Ideal for reducing bright light in large aperture 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. Sunpak Neutral Density filters are available in three strengths: (2X) Reduces the light one f-stop. (4X) Reduces the light two f-stops. (8X) Reduces the light three f-stops.
This filter works really well. It is not quite as well built as other much more expensive filters. But I bought them for their really low price and was not disappointed. They are holding up well and they get the job done for a fraction of the cost of the more expensive filters. The more expensive filters, of course, are much higher quality glass and are much more firm in their metal frames; so for professional work the higher priced filters would be a must. But for casual work where cost is a primary consideration, I would have no problem recommending these to anyone.