The Tiffen 6.6 x 6.6" 1 Skyfire graduated filter allows you to specifically add a unique orange to yellow gradient to skies and other bright areas of an image whilst allowing part of the image to remain neutral. The filter's colouration is densest at the edge and fades to become transparent in the middle, with a smooth transition between the density areas and clear areas. The colour density 1 provides less Skyfire colouration than the density 2 filter.nnThis filter is manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding it flat to a tolerance of 1/10,000th of an inch. It measures 6.6 x 6.6" / 167.6 x 167.6 mm.nnn- Provides a unique orange to yellow gradient over half of the filter plane.n- The graduated filter design maintains part of the image neutral, giving a more realistic appearance whilst allowing the sky or other bright areas to take on the density colour.nnnSpecificationsnn