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Subject:Re: what are dichroic light bulbs? 0.87% VW USRDA Conten
From:David Beierl
Date:Fri, 9 Feb 2001 08:39:43 -0500
At 02:26 AM 2/9/2001, Mick Kalber wrote:
>Gee... guess I was all wet!  I shoot video for a living and we use dichroic
>filters... they make tungsten like the same temperature as daylight... 56K.
>But I guess it depends on what color the dichroic is tuned to, eh?

Right, it's strictly a matter of film thickness.  Of course the apparent
film thickness varies with the angle of incidence of the light through the
filter, so you only get the precise color exactly on-axis.  As you go
off-axis the color tends more and more toward red.

d

David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
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