One, covering 2/3 of the glass, graduates from 4 stops to the central clear, while the smaller 1/3 section goes from 2 stops at the outer edge of the glass to the clear section (ND1.2 up/.6 down) . The Schneider ND Dual Grad is ideal for diminishing distracting backgrounds and foregrounds - for example, neutralizing the sky above and the pavement below when used for a car shot. The Schneider ND Dual Grad filter is available in the 6.6"x6.6"size. www.centuryoptics.com
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