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Thread: ND fader filter on LCD screen - strange behaviour

  1. #1 ND fader filter on LCD screen - strange behaviour 
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    I'm a photographer, and have bought an ND filter for my camera.
    When i put the fader filter on my camera, i have the ability to turn on of the rings, which makes it a certain amount darker for each step - usually nothing happens, if you just spin the whole thing around. But today i noticed this strange thing. When i move the entire fade round in front of my laptop screen, it gets darker.

    Can you guys give me an explanation? Here is a video i recorded of the penomenohm: ND fader filter - LCD screen behaviour - YouTube


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  3. #2  
    Administrator KALSTER's Avatar
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    Do you have a pair of polaroid glasses?


    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
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  4. #3  
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    Nope. i do not
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  5. #4  
    Administrator KALSTER's Avatar
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    Well, an LCD screen uses polarizing filters in its structure. Your ND filter is also polarized evidently, so as you turn it, you gradually orient the polarising layers of your ND filter and LCD monitor until they are perpendicular to each other, blocking the light from coming through. If you had polaroid glasses, you would have been able to do the same with them. Polarizing filter (photography) - Wikipedia, the free encyclopedia

    From that page:
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    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
    "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle
    Reply With Quote  
     

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