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The SW150 Little Stopper is a 150mm square glass neutral density filter which reduces light transmission by 6 stops. It's an ideal companion for the Big Stopper as it can be used for picture taking at the beginning or end of the day when ambient light levels are less to produce similar effects. Supplied with foam lined protective tin.
A reference card is included with the filter to help calculate exposure times. Take a meter reading without the filter, and then add 6 stops of exposure, so for example a metered exposure of a 30th of a second at f11 would need to be increased by 6 stops making a new exposure time of 2 seconds.