| http://www.w3.org/ns/prov#value | - Hi Mozzy, The UV gives protection & reduces the ultra violet haze (often found hot windless days) in landscape photography, the polariser needs to be of the circular sort if you have autofocus on your camera, but is mainly used to cut reflections, darken skys & increase colour saturation in foilage etc; it also works as a two stop ND filter so reduces light hitting your cameras sensor, the latter
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