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Re: Neutral Density Filters

  • From: Cameron Shaw <cameron@xxxxxxxxxxxxx>
  • Subject: Re: Neutral Density Filters
  • Date: Thu, 02 Jul 1998 09:57:13 +0100
Willem-Jan Markerink wrote:
> 
> In article <6nb3f2$3rp@xxxxxxxxxxxxxxxxxx>,
>    bcasselb@xxxxxxxxxxx (Bill D. Casselberry) wrote:
> >
>
> 
> Both ND and polarizers are notoriously bad in the IR-spectrum....they pass
> IR almost unaffected. A crossed set of polarizers makes a decent IR filter,
> just like a strong ND.
- -------------------------------------------

Yes, I just received a transmission plot of a ND Lee filter and from
680nm
 it has little influence.
Some ND filter designs take into account that the large sheets may be
used
 for lighting, so accoring to Lee filters, they have to transmit
infrared
 to prevent fire hazards.
Cameron Shaw
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