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A glass 100x100mm neutral density filter which reduces light transmission by 10 stops, thus extending the shutter speed to allow anything which is moving in your image to become blurred or ghost like. Subjects such as clouds, waterfalls, rivers and the sea work particularly well. Also useful for removing traffic and people from cityscapes. Supplied with foam lined protective tin (also available separately).
A reference card is supplied with the filter to help calculate exposure times. Take a meter reading without the filter, and then add 10 stops of exposure, so for example a metered exposure of a 30th of a second at f11 would need to be increased by 10 stops making a new exposure time of 32 seconds.