Singh-Ray Vari-ND

Discussion in '35mm Cameras' started by Mark Turney, Nov 19, 2004.

  1. Mark Turney

    Mark Turney Guest

    Anyone had any experience with this product:
    http://www.singh-ray.com/varind.html ? It's $340; but, as far as I can tell,
    you can get the same effect by placing two polarizers back-to-back. The
    polarizers either have to both be linear; or you have to put a circular
    polarizer against the camera, and a linear out front. This is because the
    front of a circular polarizer is actually a linear polarizer, with a
    quarter-wave plate behind (that's why they cost more) to "spin" the photons
    (won't mess up AF & metering in SLRs). In order to get the increasing
    density effect, the two linear polarizers must be in series. If the circular
    polarizer is in front, then you get a light flow as follows: linerar >
    quarter-wave plate > linear. You must have linear > linear.

    Try it!
     
    Mark Turney, Nov 19, 2004
    #1
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