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The Hoya Ultraviolet (UV) Glass Filter is a multi-purpose filter that is designed to optimize the photography experience of the digital SLR user. UV filters absorbultraviolet rays that often make outdoor photographs hazy and indistinct and should be constantly fitted to a lens to provide improved clarity and color balance as well as to provide protection to your lens. Hoya HMCfilters are optimized for use with digital SLR camerasbut they are also perfect for traditional 35mm SLR applicationsincludingblack and white photography. The Hoya Circular Polarizing (PL) Filter allows you to remove unwanted reflections from non-metallic surfaces such as water and glass and they also improve color saturation clarity and contrast. A polarizer is different than most filters in that it is composed of two pieces of glass mounted independently inside a round frame so that one can be rotated relative to the other. As it is rotated it increasingly cuts out glare and haze. With an SLR you can actually observe this change through the viewfinder. Polarizers reduce glare from water glass or any non-metallic surface. You can also use a polarizer filter to darken blue skies. Polarizers come in two versions linear and circular and autofocus cameras will perform best with a circular polarizer. This Hoya Neutral Density (ND) Filter is an essential accessory for any photographers camera bag. ND filters reduce the amount of visible light that enters the lens allowing the user to utilize wider apertures or slower shutter speeds particularly in bright conditions. ND filters work especially well for portraits by allowing the photographer to reduce the depth of field producing pleasant background blur while keeping the subject in sharp focus. These filters are also often used to emphasize movement by permitting slow shutter speeds in bright light giving life to photos that would otherwise look frozen in time. This particular filter is designed to minimize reflection on the filter surface which reduces flare and ghosting and produces sharp contrast and well-balanced color. An ND8 filter reduces the amount of light by 3 stops.