Circular Polarizing Filter Compatible with Sigma 30mm f/1.4 DC HSM Art K

Circular Polarizer - Light and sun rays that are reflected become polarized. Circular polarizing filters selectively control which polarized light rays enter your camera's lens. Circular polarizing filters reduce unwanted reflections from non-metallic surfaces like water or glass, while also enhancing color saturation and improving contrast. You can see the effect through the viewfinder or LCD screen and adjust it by rotating the filter. The filter factor changes based on how the filter is rotated and its angle relative to the sun. Circular polarizing filters do not alter the overall color balance of the shot. Includes a 1 Year Warranty.

• Ultra-slim aluminum frame avoids vignetting while maintaining rotation capabilities for adjusting levels. Nonslip upper rim helps install, rotate and remove easily. Double sided, multi-layered coatings, anti-oil, anti-dust, anti-soil, scratch & water resistant.
• Circular CPL filters allow you to remove unwanted reflections from non-metallic surfaces such as water, glass, etc. They can also enhance color and contrast. Often used to increase contrast and saturation in blue skies and white clouds.
• CPL filters arrange and filter directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of the light. Clears up haze in distant landscapes and provides more saturated, vivid colors. Strongest effect when used at a 90° angle from the sun.