This Cokin P Series Graduated Neutral Density 0.9 to 0.3 Filter is designed for use with a Cokin P Series Filter Holder. Its 0.9 to 0.3 density creates a darkening of the entire image that is graduated, allowing you to suppress specific areas of an image such as very bright skies, while providing a similar, but reduced effect in other regions of the image that can benefit from a more moderate reduction in exposure, such as reflecting water or sand.
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