Hoya PROND 77mm ND32 (1.5) 5 Stop ACCU-ND Neutral Density Filter XPD-77ND32 Exclusive Hoya ACCU-ND technology ensures accurate color balance when switching between ProND filters Filter provides "X" amount of neutral density stops (depending on the filter you can insert X-see press release) Manufactured from super high quality "Hoya Clear" optical glass Assembled using a one-piece aluminum frame creating a rigid, durable, but lightweight filter Perfect for Still and Video applications