The Agfa Photo 77mm Multi-Coated Circular Polarizer Filter helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. This results in a noticeable increase in the saturation of skies and foliage, as well as clearer imagery when photographing in hazy conditions.
A circular polarizer 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.
This filter features a multi-coated optical glass construction to help reduce internal reflections and improve light transmission and contrast. It also features an aluminum filter ring to provide durability and help reduce jamming.
|Filter Factor||About 2.5 (1.3 stops)|
|Effect||Eliminates reflections and haze and improves color and tonal saturation|
|Construction||Optical glass and aluminum filter ring|
|Front Filter Thread Size||77 mm|
|Front Lens Cap Size||77 mm|