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Thread: Filters: 2x stacked ND4 equals ND8? or ND16

  1. #1
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    Question Filters: 2x stacked ND4 equals ND8? or ND16

    Curious. Does stacking 2 ND4 filters add up to ND8 or ND 16??
    How about closeup filters? [+4] stacked above another [+4] = +8?

  2. #2

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    ND16

    .. same to ND8 + ND8 .. become ND64
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    really? then +1 stack +4 == +4?
    I thought the stops were powers of 2
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    heh is there a +1?
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    heh paiseh didn't know the numbers not in stops but in 2^stops...
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    OK.. I get it! thanx megaweb!

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    what if u stack say 4 n 2?? = 8? or something else???

  8. #8

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    ND4 lets in 25% of the light.. ND2 lets in 50% of the light.

    so when you stack 2x ND4, you get 25% of 25%, hence something similar to ND16.

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    Originally posted by shawntim
    ND4 lets in 25% of the light.. ND2 lets in 50% of the light.

    so when you stack 2x ND4, you get 25% of 25%, hence something similar to ND16.
    Would that mean that if i were to stack ND4 n ND2

    it would mean it would be 25% of 50% ?? assuming the ND2 is the filter on the top of ND4??

  10. #10

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    Originally posted by Revo


    Would that mean that if i were to stack ND4 n ND2

    it would mean it would be 25% of 50% ?? assuming the ND2 is the filter on the top of ND4??
    25% of 50% and 50% of 25% is the same thing right? so you'll let in only 12.5% of light which is the same as ND8 (100/8)

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