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Hoya HRT Circular-Polarizer UV Filter 40.5mm
- Combination UV and Circular Polarizer
- 2.5-2.8x Filter Factor, 1.3-1.5 Stops
- Helps to Eliminate Reflections and Glare
- Reduces Haze in Landscapes
- Greater Color and Tonal Saturation
- Blocks Ultraviolet Light
- Reduces Bluish Cast of Daylight
- Non-Coated, Optical Glass
- Aluminum Frame
- 49mm Front Filter Threads
The Hoya 40.5mm HRT Circular-Polarizer UV Filter is designed to block ultraviolet light and reduce the bluish cast of daylight while also helping to eliminate 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 filter with polarizing capability 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.
This filter is non-coated and offers approximately 98% average light transmission due to its High-Rate Transparency polarizing film. It is constructed from optical glass and precision milled aluminum frames.
- Blocks UV light and reduces bluish cast of daylight.
- Helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface.
- Polarizing 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.
- Circular polarizers are ideal for use with digital cameras and autofocus lenses where a linear polarizer will often disrupt auto exposure and focus features.
- High-Rate Transparency polarizing film helps provide approximately 98% average light transmission.
- 2.5 to 2.8x filter factor reduces exposure by 1.3 to 1.5 stops.
- Constructed from optical glass and precision milled aluminum frames.
- Plastic filter case for storage and transport.