This 100mm x 132mm filter is an important filter for landscape/seascape digital image makers; Allows you to balance the exposure of your image holding back the brighter sky vs. the foreground by 1 f/stops. -LIPA Resin filters are made with the finest CR39 optical material and very easy to clean. -They have field tested perfectly for years and are very neutral. -This Graduated ND filters are compatible with the LIPA 100mm Aluminum Modular Holder the Lee 4 x 4 FK Holder and the Cokin Z-Series holder. -Whatever format you shoot Graduated Neutral Density filters help cameras record scenes more like we see them. - With a broad tonal range that's lost if not captured in the moment. -Soft Edge Graduated Filters perform best in the woodlands mist or interiors or any horizon line that has deviation such Rock Formations Mountains and trees - Wherever there is no definite transition between sky and foreground a soft grad will gently balance exposure across the image. -Neutral Density Grads can be stacked together or with other filters so you can respond to almost any lighting situation.