The tiffen 77mm indie neutral density filter kit is designed to optimise your outdoor shooting experience included are four filters a 1 stop 03 2 stop 06 3 stop 09 and 4 stop 12 set of nd filters using these filters permits you to use slower shutter speeds that can produce blurred effects of nature sports or any action you choose ie flowing water cars etc this combination of nd filters gives you the freedom to make some unique and effective images that would ordinarily not