SIGMA WR UV Anti-Static Filter with Water and Oil-Resistance, Compatible with All SIGMA Lens (55mm)The SIGMA WR UV 55mm Filter is a UV Water repellent, antistatic type filter that prevents the bluish tone that generates when the weather is fine, by absorbing ultraviolet rays. It is effective in most situations, such as landscape, portrait and general photography on a sunny day. It is also an ideal filter for regular use as it is completely colorless so does not affect color reproduction. Water Repellent Coating The WR coating reflects only 0. 24