The B+W 27mm UV Haze SC 010 Filter (.50 Thread Pitch) is a general use, clear filter designed to absorb ultraviolet light and reduce the bluish cast of daylight. Aside from the reduction of unwanted blue casts, no additional coloration or contrast is created, and adjustments to exposure are not required while using this filter. To prevent internal ghosting and reflections while providing over 98% light transmission, each glass surface includes one layer of anti-reflection coating.