TheThis high-quality Sigma UV Filter blocks the invisible UV component of light from the sky, which can cause blur and often a blue cast. UV Filters are ideal for photography in high altitudes, by the sea and in regions with very clean air. The pictures gain brilliance and disturbing blue casts are avoided. As 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. The colourless glass also makes a UV Filter very suitable as protection for the front element of your lens against dust, flying sand, sea water spray etc and can be kept on the lens at all times. It is recommended for colour and black & white film, as well as digital photography. Sigma has treated this filter with a multi-layer coating process, which, in addition to its UV-blocking qualities, makes these filters especially scratch-resistant. This also dramatically reduces the chance of flare in images. Sigma DG filters benefit from super multi-layer lens coatings, developed to counteract the highly reflective characteristics of digital image sensors, reducing both flare and ghosting
Black rimmed glass eliminates unnecessary internal reflections
UV filters absorb ultraviolet light which can often make outdoor photographs appear hazy. By cutting through this haze, images look sharper and in the case of colour photography, the UV filter can correct the blues and violets
UV filters can also be used as a protective filter, remaining on the lens at all times to prevent damage to the front element
Sigma DG filters deliver high performance on both digital and film SLR cameras.
Sigma Multicoated Ultra Violet Filter