Re: Filters

[Dan Vint <dvint@xxxxxxxx>]

Actually the answer isn't there, that was why I was asking. At least I
didn't find a mapping from Wratten to anything.

I did find that an 87c is a 093 in B+W and an 89B is an 092 in B+W and
Wratten 12 is a 099 B+W.

It doesn't appear that Tiffen has any IR filters and I found the Hoya (2
filters) but they aren't rated to the Wratten system.  Hoya has an R72 that
passes IR above 720nm and an RM90 that passes above 900nm - which I guess
makes the
R72 an 89B and the RM90 somewhere between an 87c and 87b.

..dan


At 02:15 PM 2/21/00 -0500, you wrote:
><<Can someone provide the filter numbers (or the closest match) for the
>following manufacturers
>Wratten B+W Hoya    Tiffen
>#87
>#87c>>
>
>I don't know them off hand but it is all in the FAQ
>at  http://www.cocam.co.uk/CoCamWS/Infrared/INFRARED.HTM
>
>There is a chart for that  ;-)
>
>~Holly~
>
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