B+W 72mm Neutral Density ND 64x 1.8 106 Glass Filter - $169

B+W 72mm Neutral Density ND 64x 1.8 106 Glass Filter

This filter is especially useful when making extremely long exposures (several minutes) as it offers a 6 f/stop reduction. It is also suited for video. Filter factor is 64.B+W neutral density filters are made out of neutral gray Schott NG-glass. They block the entire visible spectrum evenly and allow light reduction without influencing color rendition or contrast. Sometimes it is necessary to cut down the amount of light with neutral density filters when working with high-speed films. For example, the B+W 102 filter allows exposures with ISO 400/27 degree film as if it were 100/21 degree film. It is often used to portray a subject against an out of focus background. A neutral density filter comes in handy if you would like to increase the aperture more than the light situation and camera capabilities permit. They are also good for the long exposures which are necessary for a blur-effect or zooming during the shot.

This B+W Neutral Density Filter reduces the light by six f-stops.  With this filter and without changing the f-stop, a shutter speed of 1/60s is changed to a full second, thus requiring the use of a tripod.  Flowing water is rendered as flowing in the photo, and people moving in streets are dissolved in unsharpness or become invisible.  Because of its higher transmission in the red beyond 660mm, this filter brings a slightly warm tone to color photographs.