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denomination of Schott/Heliopan filters

  • From: Eckhard Stephan <eckhard.stephan@xxxxxxxx>
  • Subject: denomination of Schott/Heliopan filters
  • Date: Sun, 02 Apr 2000 11:57:54 +0200
Hello everyone,

during a discussion between Gavin Wrigley and me about his new IR pages
we came to talk about the denominations used by Schott / Heliopan for
their glass filters. I always thought, that in names like RG-XXX XXX
stood for the filter's cut-off frequency. Meanwhile I'm not so sure
about that anymore. Maybe someone could clarify this? 

Thanks in advance,

Eckhard


-- 
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*          Eckhard Stephan             * 
*          Freiburg (Germany)          *
*     eckhard.stephan@xxxxxxxx         *	
*   http://www.eckhards-photobox.de    *   
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