The Tiffen 4 x 5.65" Skylight 1-A Filter is a versatile filter with a slight pink tint to improve overall colour accuracy and clarity. The pink colouring helps to reduce the overall bluish cast of daylight and is particularly effective for landscape photography and shooting in shade.nnThe Sky 1A filter is also useful as a general protective filter to leave permanently on lenses. Filters help to reduce dust and moisture that could reach your lens element and provide additional protection in the event of drops or situations where scratches could occur.nnTiffen filters are manufactured using ColorCore technology; a process that involves laminating the filter substrate between 2 pieces of optical glass and polishing flat to a tolerance of 1/10,000th of an inch. This filter measures 4 x 5.65" / 101.6 x 143.5 mm.nnn- Helps to improve overall colour accuracy and clarity when shooting outdoors in daylight and shade.n- Light pink tint reduces the bluish cast of natural light.n- General protective filter reduces dust, moisture and scratches that could reach lens elements.nnnSpecificationsnnn