--- Richard Heather <rheather@slonet.org> wrote:
> You need a red filter to remove the visible light.
Actually, a red filter allows the red visible light to pass. An opaque filter
(like an 87, 88, 89, R72, etc.) will allow only IR.
Cheers -
george
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Received on Mon Jun 4 17:18:16 2001
This archive was generated by hypermail 2.1.8 : Mon 13 Dec 2004 - 23:33:21 PST