Re: denomination of Schott/Heliopan filters

["phillip geller" <filje@xxxxxxxxxxx>]

Subject: denomination of Schott/Heliopan filters


> 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
*
> ******************************************************

It looks like the designation is the 50 percent transmission point of the
filter  , at least that is the way it looks on the little charts that i
have.

Phil


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