Filters: 2x stacked ND4 equals ND8? or ND16


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viix

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Oct 25, 2002
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#1
Curious. Does stacking 2 ND4 filters add up to ND8 or ND 16??
How about closeup filters? [+4] stacked above another [+4] = +8?
 

shawntim

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Feb 13, 2002
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#8
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.
 

Revo

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#9
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??
 

shawntim

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Feb 13, 2002
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#10
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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