Hoya 72mm alpha Circular Polarizer Filter

Hoya 72mm alpha Circular Polarizer Filter

Hoya 72mm alpha Circular Polarizer Filter

B&H # HOCPA72 MFR # C-ALP72CRPL
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Product Highlights

  • Circular Polarizer Filter
  • 3 to 4x Filter Factor, +1.6 to 2 Stops
  • Helps to Eliminate Reflections and Glare
  • Reduces Haze in Landscapes
  • Greater Color and Tonal Saturation
  • Non-Coated
  • Optical Glass
  • Aluminum Frame
  • 72mm Front Filter Threads
  • Plastic Case
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  • 1Description

The Hoya 72mm alpha 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. 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.

This filter is non-coated and has approximately 96% average light transmission. It is constructed from optical glass and precision milled aluminum frames.

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.
Non-coated.
Approximately 96% average light transmission.
3 to 4x filter factor reduces exposure by 1.6 to 2 stops.
Constructed from optical glass and precision milled aluminum frames.
Plastic filter case for storage and transport.
UPC: 024066056207
In the Box
Hoya 72mm alpha Circular Polarizer Filter
  • Plastic Filter Case
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description
    Filter Type Circular Polarizer
    Filter Factor 3 - 4 (1.6 - 2 Stop)
    Shape Circle
    Circular Size 72 mm
    Front Accessory Thread / Bayonet 72 mm
    Filter Material Glass
    Coatings None
    Packaging Info
    Package Weight 0.13 lb
    Box Dimensions (LxWxH) 4.3 x 3.5 x 0.6"
    72mm alpha Circular Polarizer Filter is rated 4.0 out of 5 by 2.
    Rated 4 out of 5 by from Strong, but thick I bought this for my Sony 16-50 2.8, it's got a strong effect to it and feels sturdy, my only real concern is its so thick that I have to either zoom or increase my aperature on my lens to get rid of the vignetting. It comes in a standard filter, it has a nice even coating that achieves pleasing results. I Would recommend this filter.
    Date published: 2014-09-19
    Rated 4 out of 5 by from I would buy this product I like using the circular polarizer. I have two others that fit my lenses of different mm. I like using it for the contrast I can achieve under certain lighting conditions. It fits easily on my lenses and rotates quite easily. I have had very good picture quality with my other polarizers and expect no different with this one. I have only started using it with my 85mm, 1.4 lens. So far the results have been what I expected. A very nice filter.
    Date published: 2016-08-09
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