Filters: UV Skylight (1A) filter (ultraviolet) for protection against dust, dirt, scratches, fingerprints and the sun's ultraviolet rays. Circular Polarizing Filter. Used to increase color saturation, like darkening blue skies so that white clouds stand out. Filter Factor Between 2.1 and 2.5 (approx. +1.2 stops) Both Filters contain the following characteristics. High-index / low-dispersion optical glass, Fully multi-coated, Anti-reflection coating, Titanium anodized finish, High speed auto-focus / Infrared compatible, Designed to maximize day and night shots by providing maximum light and image transmission, Fantastic for all types of photographic situations. 10 year Warranty