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Stupid Questions

  • From: "Daniel Goodale" <goodaled@xxxxxxxxxx>
  • Subject: Stupid Questions
  • Date: Tue, 13 Oct 1998 12:47:01 -0500
Fellow IRDers,

	I was thinking last night (always a dangerous thing) about filters.  I have
two 25 red filters and when I put them together it looked a whole lot redder
or is it darker red.  Would two medium red filters add up to a dark red
filter?  I'm thinking it doesn't because it would not change the wavelength
of the light that got through, just the amount.  But, for the purpose of IR
effects on film, will 2 filters block the low wavelengths more and let the
same amount of IR light through?  Could I do this with a ND filter or a
polarizer. Kind of a poor man's 87?  Hope I'm not plowing old ground.


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