Cokin z pro 121s graduated g2 soft gray resin filter often it is necessary or desirable to balance the light intensity in one part of a scene with another this is especially true in situations where you dont have total light control as in bright contrasty landscapes exposing for the foreground will produce a washed out over exposed sky while exposing for the sky will leave the foreground dark and under exposed cokin graduated gray nd filters are part clear part neutral density they all