Sigma 105mm Weather Resistant WR Circular Polarizer Filter is ideal for use with digital SLR cameras and autofocus lenses where a linear polarizer will often disrupt auto exposure and focus features. The Sigma filter is an essential accessory for outdoor photography and fits selected lenses with a 105mm filter thread. The filter removes unwanted reflections from non-metallic surfaces such as water or glass and also saturates colours providing better contrast. The polarizer helps make a blue sky bluer as well as making clouds stand out.
The effect can be seen through the viewfinder and changed by rotating the filter. Produce the strongest effect when used at a 90° angle from the sun. The filter increases light transmission and colour saturation without affecting the overall colour balance. It clears up haze in distant landscapes and provides more saturated and vivid colours. The filter protects the front lens surface from dust, scratches, dirt and fingerprints. The filter is lightweight and very easy to install & detach from the lens.