This Kase 90mm Magnetic Circular Polarizer Filter is compatible with a Kase K9 100mm Filter Holder. It helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. The light from the sun naturally becomes partially polarized due to reflecting off electrons in air molecules, causing the light to scatter into what appears as haze. A polarizing filter arranges and filters this directionally polarized light perpendicularly to the reflected light, allowing for the absorption of much of this light. This results in a noticeable reduction of glare and reflections from non-metallic surfaces and an increase in the saturation of skies and foliage.
A circular polarizer only differs from a linear polarizer in that it contains a quarter wave plane in addition to the linear polarizing filter. The addition of this quarter wave plane is to circularly polarize the linearly polarized light for the use of auto focus and exposure functions. Due to how the light is broken down and filtered with a linear polarizer, auto focus and exposure accuracy become skewed during use. When the light becomes circularly polarized, it permits the use of these functions.
Mounted within a non-threaded, steel filter ring, this filter is made specifically to fit within a separately available Kase 90mm Magnetic Lens Adapter Ring behind a Kase K9 100mm Filter Holder. Constructed from Schott B270 Superwhite glass for enhanced clarity and color fidelity, each glass surface includes multiple layers of anti-reflection coatings to prevent internal ghosting and reflections. These coatings also offer greater protection to the filter substrate and help it to stay clean for longer than with uncoated filters.
- Drop-in magnetic circular polarizer filter for separately available Kase K9 100mm Filter Holder
- Polarizer filters help to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface, clear up haze in distant landscapes, and provide more saturated, vivid colors
- Does not disrupt auto exposure or focus features and is constructed from Schott B270 Superwhite glass for enhanced clarity and color fidelity
- Multi-coated to prevent internal ghosting and reflections and features scratch-resistant, mold-resistant, and hydrophobic coatings on each glass surface to protect the filter substrate and result in an improved beading effect when in contact with water or oil for greater cleaning efficiency
- 2x filter factor reduces exposure by 1 stop
- Designed to avoid vignetting when used with a wide-angle lens and can be independently rotated to adjust the intensity of the polarization effect
- Plastic case for storage and transport