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    ND + CTO Gel

    Hey everyone
    I'm wondering about ND gels to be used on windows. Obviously, ND alone cuts lights by set amounts of stops: .15=1/2 Stop, .3=1 stop, .6=2 stop etc. But what I'm wondering about is when they are mixed with CTO, is it the loss of the ND plus the loss of the CTO (i.e. 2 stop loss for ND.6 plus the 2/3 stop loss for CTO, a total of almost 3 stops lost) or do the gel manufacturers tone down the ND strength in these gels so that the new gel combination loses only 2 stops total? Thanks for any answers or hunches.
    Peace,

    -Harry

    #2
    Good question. I believe you combine them so it would be the loss of the CTO (2/3 stop) and ND (1, 2, 3, etc). I think it's the same thing with 85 ND combo filters for cameras.
    www.barrycheong.com

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      #3
      Yes, you add stops lost or multiply filter factor.
      http://www.TheThrillMill.com

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        #4
        Cool...thanks guys.
        Peace,

        -Harry

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