The Tiffen 4 x 4" Blue 5 Soft Edge Graduated filter is a soft-edge graduated colour filter that adds a bluish tint to the image, giving a refreshing effect to your photographs. The graduated filter design allows part of the image to remain neutral, creating a more realistic appearance whilst allowing the sky or other bright areas to take on the density colour. Density 5 provides a less pronounced blue tint than the density 4 filter. Tiffen filters are manufactured using ColorCore technology, a process that laminates the filter substrate between 2 pieces of optical glass, then grinds it flat to a tolerance of 1/10,000th of an inch. This filter measures 4 x 4" / 101.6 x 101.6mm. Features: - Blue tint gives a refreshing effect to part of the image. - Soft-edge gradation to transparent to maintain a neutral part of the image. Specifications: - Type: Soft-edge graduated blue - Size: 4 x 4" / 101.6 x 101.6mm (4mm thick) - Grade: Density 5 - Effect: Used to give photographs a dramatic coloured effect - Construction: ColorCore technology