Hoya HD Circular Polariser Filter

Description

Hoya HD Circular Polariser Filter

The HOYA CIRC-POL HD Filter helps to reduce reflections and glare by filtering out light that has become polarised due to reflection from a non-metallic surface. The light from the sun naturally becomes partially polarised due to reflecting off electrons in air molecules, causing the light to scatter into what appears as haze. A polarising filter arranges, and filters, this directionally polarised 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 polariser only differs from a linear polariser in that it contains a quarter wave plane in addition to the linear polarising filter. The addition of this quarter wave plane is to circularly polarise the linearly polarised light for the use of auto focus and exposure functions. Due to how the light is broken down and filtered with a linear polariser, auto focus and exposure accuracy become skewed during use. When the light becomes circularly polarised, it permits the use of these functions.

This filter is constructed from optical glass for clarity as well as colour fidelity and features a thin, aluminium-alloy filter ring that can be rotated to adjust the intensity of the polarisation effect. To prevent internal ghosting and reflections, eight layers of anti-reflection multi-coatings are applied to the filter’s glass. These coatings also offer greater protection to the filter substrate and help it to stay clean for longer than with uncoated filters.

Key Features:

Circular Polariser Filter

Filter Factor, +1 Stop

Helps to Eliminate Reflections and Glare

Reduces Haze in Landscapes

Greater Colour and Tonal Saturation

Eight-Layer Multi-Coating

Optical Glass Construction

Thin, Aluminium-Alloy Filter Ring

What’s in the Box:

Hoya HD Circular Polariser Filter