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Hama is committed to developing and delivering products that achieve the highest performance at a most competitive price, within easy reach of everybody. Hama has dedicated manufacturing facilities and partners all over the world to meet the needs of all its customers for years to come.
To reduce light in case that it is too bright;
To reach large camera apertures while taking pictures outside - background gets hazy;
Exposure correction 4x - 2 stop values;
In case of exposure times longer than 1/30 seconds, water "flows" (if they are shorter, it freezes to ice).