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  • Is it Linear or Circular? The Polarizing Filter Test

    There are many great sites on the internet that do a really good job explaining the differences between linear and circular polarizers. Instead of just regurgitating that information here, we want to show a really quick and easy way to identify if a polarizing filter is linear or circular. Here's a hint, just because the filter can rotate on its mount does not make it a circular polarizer. This is a widely thought misconception. Even linear polarizers can rotate on their mounts and provide varying degrees of polarization. Also, you would think that polarizers are clearly labeled, so one can simply just read the side of the filter. This seems to be hardly the case. Here's a quick and easy (also fun, I think) way to find out if you have a linear or circular polarizing filter.

    Required supplies:
    1. Polarizing filter
    2. Mirror
    3. Eyeball

    Step 1:
    Stand in front of mirror and bring the filter up to your eyeball with the lens mounting threads facing you. You should now be looking through the filter with one eye with the filter oriented like it would be when mounted on a camera. Notice what your eye and the filter look like.

    Determining what kind of polarizing filter you have

    The Setup. Here I am holding a polarizing filter in front of this camera's lens. Substitute one of your eyes where this lens is located (behind the filter).


    Linear vs Circular Polarizer

    Here's a close up of the filter in front of the lens. Don't mind the blur....

    Step 2:
    Flip the filter around so the other side of the filter is now facing you. If what you see doesn't really change, the filter is a linear polarizer. If your eye disappears and the filter goes dark, the filter is a circular polarizer. Make sure to keep the filter in front of your eye the whole time. Don't drop it down below your eye.

    Linear vs Circular Polarizer

    Linear polarizer flipped around

    Linear vs Circular Polarizer

    Circular polarizer flipped around

    As you can see in this last picture, you can't see anything behind the circular polarizer.

    This concludes the linear vs circular polarizing filter test.

  • New--LOWER--Pricing on Carl Zeiss UV and Polarizing Filters; AND Introduction of Additional Sizes

    Carl Zeiss 72mm T* UV Filter

    We are excited to announce the price is dropping on Carl Zeiss UV and Polarizing filters. In addition, Carl Zeiss is introducing additional sizes to the existing lineup of filters. Right now Zeiss offers UV and Polarizing filters featuring the infamous Zeiss T* coating in 58mm, 67mm, 72mm, and 82mm sizes. These sizes correspond with the filter sizes used by Carl Zeiss lenses. There are many people who would love to use these high-quality filters on other lenses, however, so Zeiss has introduced 4 additional filter sizes to complete the entire range of standard filters from 52mm to 82mm.

    Here is the now current, lower pricing for the existing Zeiss filters (please feel free to click through for purchasing):

    Carl Zeiss 58mm T* Ultraviolet (UV) Filter - $67 (was $78)
    Carl Zeiss 67mm T* Ultraviolet (UV) Filter - $84 (was $101)
    Carl Zeiss 72mm T* Ultraviolet (UV) Filter - $101 (was $112)
    Carl Zeiss 82mm T* Ultraviolet (UV) Filter - $124 (was $124)

    Carl Zeiss 58mm T* Circular Polarizing (POL) Filter - $101 (was $124)
    Carl Zeiss 67mm T* Circular Polarizing (POL) Filter - $135 (was $158)
    Carl Zeiss 72mm T* Circular Polarizing (POL) Filter - $152 (was $180)
    Carl Zeiss 82mm T* Circular Polarizing (POL) Filter - $192 (was $226)

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