from wikipedia -- "this photo of strickland falls in tasmania, australia, was taken using a neutral density filter. ND filters reduce light of all colors or wavelengths equally, allowing an increase in aperture and a decrease in shutter speed without overexposing the image. to create the motion blur seen here, the shutter must be kept open for a relatively long time, making it necessary to reduce the amount of light coming through the lens." [NOTE: for motion blur of flowing water, a shutter speed of 1/8 second works well. click on the image to enlarge for a much better view.]
good collection
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