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  1. #1

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    Really powerful ND filter

    I'm looking to get a really powerful ND filter ie one darker than ND8, for taking several second exposures during the day, I haven't much money can anybody give me any recommendations, 49mm or Cokin A will do.

  2. #2
    richard ide's Avatar
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    The darkest Kodak Wratten ND96 filter is an ND4 which transmits: .01% , filter factor is 10,000 , or a 13 1/3 increase in stops. Some other manufacturers use an ND rating which is not the same. Try a welding supply firm. They have glass filters and may also have plastic which you could cut.
    Richard

    Why are there no speaker jacks on a stereo camera?

  3. #3

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    I've heard that by using 2 Polarizers stacked (not sure if linear or circular are needed) you can align them so that virtually all light is blocked. That should be a pretty cheap solution, especially if you can use linear polarizers. I've never tried it, so good luck.

    Hope this helps.
    Last edited by GeorgeDexter; 07-21-2009 at 10:23 PM. Click to view previous post history.

  4. #4

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    Hoya make an ND 400 filter which reduces exposure by 9 stops (around 1/500th of the original intensity). I believe they have a 49 mm size.

  5. #5
    JBrunner's Avatar
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    ND can also be stacked. Because stops work the way they do, you can get pretty dense, pretty fast.

  6. #6
    Robert Hall's Avatar
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    Interesting note on the stacked polarizers. While they block visible light they may very well pass Infrared Light.
    Robert Hall
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    Technology is not a panacea. It alone will not move your art forward. Only through developing your own aesthetic - free from the tools that create it - can you find new dimension to your work.

  7. #7

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    If you're skint and you've already got got a red, yellow or orange filter, ND filter and polariser you can stack them to get a pretty good descrease in transmission, so long as you don't mind the effects caused by the colour/polarising filters. I use this technique pretty often.
    My website: Light Work

  8. #8

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    In the UK www.formatt.co.uk would be a good bet. Although I am not sure where they will ship to or the costs involved.

  9. #9
    Mike Wilde's Avatar
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    Rosco (theatrical and cinematography filter gel vendor) sells a deigner swatch book for about $25 that has every concievable gel theater you can think of. In there are ND's - 1 stop, 2 stop, and I think 3 stop in the swatch book. b&h lists it in thier catalog, and I beileve Rosco also sells them directly.

    The full gel sheets are about 20x30" and sell for under $10. Optically not always perfect, but usually close enough to confirm if you want to sink more money into a glass filter, and have loys left over to think up other uses for.

    Glass welding filters are frequently green in tint as well as ND. They may be falling out of favour now, because active LCD filters have come onto the market, and if you are a welder, oh, it is so worth the money.
    my real name, imagine that.

  10. #10

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    Steve

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