Neutral density ( ND) filters

A lil more about Neutral density filters "BrO" , im glad u asked . I was actually planning on writing a post on that . Heres the wikipedia definition ...

In photography and optics, a neutral density filter or ND filter is a "grey" filter. An ideal neutral density filter reduces light of all wavelengths or colors equally. The purpose of standard photographic neutral density filters is to allow the photographer greater flexibility to change the aperture or exposure time, allowing for more control, particularly in extreme circumstances. For example, on a very bright day, one might wish to photograph a waterfall at a slow shutter speed to create a deliberate motion blur effect. In order to do this, one would need a shutter speed on the order of tenths of a second. There might be so much light that even at minimum film speed and a minimum aperture such as f/32, the corresponding shutter speed would still be too fast. In this situation, by applying an appropriate neutral density filter one or more stops can be taken out of the exposure, allowing a slow shutter speed and more pleasing effect.

GRADUATED ND FILTER : A graduated ND filter is similar except the intensity varies across the surface of the filter. This is useful when one region of the image is bright and the rest is not, as in a picture of a sunset.

That was the wikipedia definition , but in the simplest of meanings an ND filter is like the sunglasses u wear but for the camera , they just allow less light to enter ur cam ..

For more on that visit wikipedia .