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Hoya 72mm Linear Polarizer Glass Filter

You Pay: $31.68

Light rays which are reflected become polarized. Polarizing filters are used to select which light rays enter your camera lens. They can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast. The effect can be seen through the viewfinder and changed by rotating the filter. The filter factor varies according to how the filter is rotated and its orientation to the sun. Filter factor is between 2.3 and 2.8 (approx. +1.3 stops).

Linear polarizers are used with most video and manual focus photo cameras. They are not recommended for auto-focus SLR cameras.

PLEASE NOTE: All auto-focus SLR and certain manual focus SLR cameras require circular polarizers. Consult your instruction manual.

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by PowerReviews
Hoya72mm Linear Polarizer Glass Filter
 
5.0

(based on 2 reviews)

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Reviewed by 2 customers

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5.0

Linear+Circular = variable ND to +9stops

By Jim

from Midwest

About Me Tech Savvy

Verified Buyer

Pros

  • Easy To Use
  • Improves Picture Quality
  • Thrifty variable ND filtr

Cons

    Best Uses

    • Shooting Outdoors

    Comments about Hoya 72mm Linear Polarizer Glass Filter:

    I purchased this to put in front of a circular polarizer to have a variable ND filter. This is how the much more expensive variable neutral density filters work.

    Circular polarizers actually are a linear polarizer in front with a quarter wave plate underneath so that after the polarized light that gets through the linear front part, the light is then is unpolarized by the quarter wave plate so as to not give problems with autofocus systems. By putting another linear polarizer in front without the quarter wave plate, the light remains polarized after going through the linear polarizer and the circular polarizer can now adjust how much light will get through to the camera. By crossing the polarizers, almost no light gets through while if both polarizers are in alignment, almost as much light get through as with just one polarizer.

    Initial tests show it works better than I imagined. With polarizers crossed, it is over a 9 stop ND filter, in the league with the Lee Big Stopper etc. while it also can be dialed back to only a few stops. Plus, you get all the features of a polarized filter. If you need to hold one of the two polarizers in place while rotating only one of them, a small piece of gaffers tape does the trick.

    I will have to check for color shift, but even that is not too hard to deal with using a white and gray reference card and then digital photo software to readjust the color balance.

    Do make sure you have a good circular polarizer in back of the linear polarizer. There are some that are made for low-light photography that pass more light through. I suspect these do not have as sharp a polarization cut-off and thus may not be able to give +9 stop ND.

    Linear polarizers are relatively inexpensive and if you get one as large as you largest circular polarizer, some step-down rings will fit it to your smaller circular polarizers.

    • Was this a gift?:
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    (3 of 4 customers found this review helpful)

     
    5.0

    Great General Use, Outdoor Filter

    By spinyon

    from Rolla, MO

    About Me Photo Enthusiast

    Verified Buyer

    Pros

    • Clear Optics
    • Consistent Effect
    • Strong Construction

    Cons

      Best Uses

      • Image Manipulation
      • Lens Protection

      Comments about Hoya 72mm Linear Polarizer Glass Filter:

      This polarizer is a fantastic way to cut down unwanted vertical glare on your high light outdoor photography. Since it is a linear polarizer, it allows you to play with the effects while you are shooting. Be careful though, if you are using an autofocus lens, you may have to readjust after each focus. If you are looking for an all around foolproof polarizer, you may want to go with the spherical polarizer.

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