The bw 46mm mrc clear uv haze 010 filter blocks the invisible uv component of light from the sky which can cause blur and a blue cast uv filters are ideal for photography in high altitudes in the mountains by the sea and in regions with very clean air because the glass is colourless colour rendition is not altered aside from the elimination of the unwanted blue cast and no increase in exposure is required that makes a uv filter very suitable as protection of the front element of the